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(Chapter 9) Technical Service Manual Oct 2005 (HWE05020).

1. 4 Pressure sensor 1 Remove the service panel 1 For the pressure sensors PS1 and PS3 refer to 1 1 2 2 Remove the pressure sensor connector in trouble from e a 6 hits the control board and insulate the connector 1 Liquid side pressure sensor CNP1 2 Intermediate part pressure sensor CNP3 3 Attach a new pressure sensor to the place which is shown in the figure and insert the connector to the control board Note When gas leaks from the pressure sensor repair the leak and follow the instructions above if re quired TH12 TH15 SVM1 For NU G type there is no SVM2 CMB 1016NU GA 300 gt IX Troubleshooting 5 LEV Work procedure Explanatory figure 1 Remove the service panel Refer to 1 1 2 3 2 Replace the LEV in trouble Note Secure enough service space in the ceiling for LEV2 THI6 PS1 welding operation and conduct the work carefully If required dismount the unit from the ceiling and conduct the work SVM1 For NU G type there is no SVM2 CMB 1016NU GA 6 Solenoid valve Special care must be taken when replacing heavy parts 1 Remove the service panel Refer to 1 1 2 3 2 Remove the connector of the solenoid valve in trouble 3 Remove the solenoid valve coil 1 For the solenoid valve coil of SVA SVB or SVM1 2 can be serviced from the inspection door is possible For SVC however remove the rear panel 4 machine screws to replace the coil if enough se
2. 7 1 Check the fan output wiring Connector contact failure Connect the connector Check the FAN Board side CNINV INV board fail Fan motor side ure Connector contact failure Connect the connector 3 Check the FAN INV board 1 The voltage imbalance Replace the FAN INV board failure among each motor wiring during operation The voltage imbalance is greater than the larger of the values represented by 5 or 5 V 2 Check the connector CN VDC connection The same error occurs even after the operation is restarted 4 Check the transformer on The same error occurs even if Replace the power supply trans the FAN INV board the board is replaced as de former on the FAN INV board scribed in 3 342 IX Troubleshooting 3 Trouble treatment when the main power breaker is tripped Perform Meg check between the Zero to several ohm or Meg failure Check each part in the main inverter cir terminals on the power terminal cuit block TB1 Refer to Simple checking Procedures for individual components of main in verter circuit 2 No remote control display Diode stack IPM Rush current protection resistor Electromagnetic relay DC reactor Noise filter large current relay Turn on the power again and 1 Main power breaker trip check again Turn on the outdoor unit and check 1 Operates normally without trip a The wiring may have been short that it operates normall
3. 295 IX Troubleshooting Error Error definition and error detec Caise Check method and remedy Code tion method 6608 No response When no response command is returned although acknowl edgement ACK is received after transmission an error is detected When the data is transmitted 10 times in a row with 3 seconds interval an er ror is detected on the transmis sion side Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred The transmission line work of one of the indoor unit outdoor unit or the BC controller is per formed while the power is on the transmitted data will collide and the wave shape will be changed 2 The transmission is sent and re ceived repeatedly due to noise 3 The transmission line voltage signal is decreased due to erro neous sizing of transmission line Farthest 200 m 656ft or less Remote controller wiring 10m 32ft or less 4 The transmission line voltage signal is decreased due to erro neous sizing of transmission line Wire diameter 1 25mm AGW16 or less 296 When an error occurs at commission ing Turn off the power sources of the out door unit indoor unit BC controller and LOSSNAY for 5 or more minutes and turn them on again gt When they return to normal opera tion the cause of the error is the transmission line work performed with t
4. 338 IX Troubleshooting 8 Inverter Replace only the compressor if only the compressor is found to be defective Overcurrent will flow through the inverter if the compressor is damaged however the power supply is automatically cut when overcurrent is detected protecting the inverter from damage Replace only the fan motor if only the fan motor is found to be defective Overcurrent will flow through the inverter if the fan motor is damaged however the power supply is automatically cut when overcurrrent is detected protecting the inverter from damage Replace the defective components if the inverter is found to be defective lf both the compressor and the inverter are found to be defective replace the defective component s of both devices 1 Inverter related problems and countermeasures Co Error display failure condition Measure inspection item 1 Inverter related errors Check the details of the inverter error in the error log at 10 1 Table of 4250 4255 4220 4225 4230 4235 4240 4245 4260 4265 LED codes 5301 0403 5110 Take appropriate measures to the error code and the error details in ac cordance with 9 3 Self diagnosis on the basis of Error Display on Re mote Controller and Remedy for Error 2 Main power breaker trip lt 1 gt Check the breaker capacity lt 2 gt Check whether the electrical system is short circuited or ground faulted lt 3 gt If items cause is not lt 1
5. If the pressure of 0 098MPa 14psi or low er is registered on the pressure sensor immedi ately before start up it will trigger an abnormal stop and error code 1302 will be displayed SOTA IX Troubleshooting Error Code SOF Cen ANG AMOT Cause Check method and remedy detection method 2502 Drain pump failure The error code blinks on the indoor unit in trouble Drain pump failure The error code blinks on all the indoor units in the system When the drain sensor detects water or its tip be comes immersed in wa ter during drain pump operation When the drain sensor detects water or its tip be comes immersed in wa ter during drain pump operation on stopping in door units 1 Drain pump malfunction Clogged drain pipe Return water from drain 1 2 Clogged drain pump intake 3 4 pipe Improper installation 1 Drain pump malfunction 2 Clogged drain pump intake 3 Clogged drain pipe 4 Return water from drain pipe Improper installation 275 1 Check for drain pump malfunction Check whether there is water in the drain pan Check whether there is water in the drain pan When the water level is approximately 10mm 13 32 from the bottom of the drain pan the drain pump may be nor mal Check whether the drain pump operates properly Check whether the resis tance of the drain pump is normal or the drain pump operates norm
6. main LEV1 opening 12345678910 LEV2 opening 12345678910 LEV3 opening ON 12345678910 BC controller bypass outlet superheat 12345678910 BC controller intermediate part subcool 12345678910 BC controller liquid side subcool 12345678910 LEV3a opening 123 45 6 7 89 10 LEV3a opening 335 ON 123 45 6 78910 IX Troubleshooting IX Troubleshooting Troubleshooting flow chart for solenoid Troubleshooting flow chart for solenoid valve body Check for pins not fully inserted on the connector and check the colors of the lead wires visually Intermediate connector Control board Brown Red Blue Orange Yellow White a Repair the fault Pull out the connector from the board and check that the electricity runs with a tester The wiring side of CN05 and 07 Among 1 3 and 5 and among 2 4 and 6 Repair the fault Check the resistance between each coil with a tester between red and white red and orange brown and yellow and brown and blue and check that the resistance is 150Q within 10 YES Replace LEV 336 When LEV is fully closed tick sound When LEV is fully open no sound Check the above Replace LEV Check that no refrigerant leaks fr
7. 5102 Liquid pipe stat ON the outdoor unit 3 Disconnected wire or par 10 C 50 F 9 7 kohm 5103 Gas pipe turns to anti restart mode tial disconnected ther 20 C 68 F 6 4 kohm for 3 minutes When the mistor wire 30 C 86 F 4 3 kohm error is not restored after 4 Unattached thermistor or 40 C 104 F 3 1 kohm 3 minutes if restored the contact failure l outdoor unit runs normal l 5104 Outdoor air 5 Indoor board detection Check the connector contact ly the outdoor unit eae temperature makes an error stop circuit failure When no fault is found the indoor Short board is a failure detectable at 90 C 194 F or high er Open detectable at 40 C 40 F or low er Sensor error at gas side cannot be detected un der the following condi tions During heating oper ation During cooling oper ation for 3 minutes after the compressor turns on OA processing unit Error Code Sor CEUNON anoretior Cause Check method and remedy detection method 5104 Outdoor air 1 The connector CN29 is Check the contact of the connector temperature not connected tightly Replace the sensor 2 The outdoor air tempera ture sensor is broken 251 IX Troubleshooting Temperature sensor failure outdoor unit Error Code Eror Connon and Aror Cause Check method and remedy detection method 5101 Discharge 1 When a short high Thermistor failure Check thermist
8. Inner pressure drop due to Refer to the page on the trouble a leakage shooting of the high pressure sen 2 Pressure sensor failure sor 3 Shorted circuited pressure sensor cable due to torn outer rubber 4 A pin on the male connec tor on the pressure sensor is missing or contact fail ure 5 Disconnected pressure sensor cable 6 Failure of the pressure sensor input circuit on the controller board An error can be detected 1 Overcharged refrigerant Refer to the page on refrigerant by the discharge temper amount evaluation heat ie SH 2 Thermistor input circuit Check the temperature and the pres l failure on the main board sure of the sensor on the LED moni 10K 18 F or less is detected during oper iin mounting of ther tor ation the first detec tion the outdoor unit Me RS stops at once turns to anti restart mode for 3 minutes and restarts after 3 minutes auto matically If the discharge SH 10K 18 F or less is detected again within 30 minutes after first stop of the outdoor unit the second de tection the outdoor unit will make an error stop and the error code 1500 is dis played 3 If discharge SH 10K 18 F or less is de tected more than 30 minutes after the out door unit stops and the operation de scribed in step 1 above will start 4 For 30 minutes after the stop of the outdoor unit preliminary errors will be displayed on the LED display
9. Turn off the outdoor indoor units for 5 or more minutes and turn them on again If the error is accidental they will run nor mally If not check the causes 1 5 Turn off the power source of LOSSNAY and turn it on again If the error is accidental it will run normally If not check the causes 1 5 Turn off the power source of the outdoor unit for 5 minutes or more and turn it on again If the error is accidental it will run normally If not check the causes 1 4 IX Troubleshooting 2 Grouping of units in a system with multiple outdoor units Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller Error source ad dress Outdoor unit OC Indoor unit IC LOSSNAY Error dis play M NET re mote control ler RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA Detection method No ac knowledge ment ACK at IC trans mission to OC No ac knowl edgement ACK at RC trans mission to IC No ac knowl edgement ACK at IC transmis sion
10. Outdoor low pressure 12345678910 BC controller pressure liquid side 123 45 6 7 8910 BC controller pressure intermediate part Note3 Check whether CNP1 liquid side connector on the BC controller control board and the connector CNP2 intermedi ate part are not disconnected or not loose Note4 Check the pressure value on the self diagnosis switch Same as note1 with the connector of the applied pressure sensor is disconnected from the board 330 IX Troubleshooting 2 Temperature sensor Troubleshooting instructions for thermistor START Note 1 Pull out the thermistor connector in trouble from the board l Note 2 Measure the temperature of the thermistor in trouble actual measurement value l Note 3 Check the thermistor resistor Y Compare the temperature corresponding to the resistance measured by the thermistor and the temperature measured by a commercially available thermometer and check whether there is no difference between them Y YES Replace the thermistor NO Note 4 Insert the connector of the thermistor in trouble into the board check the sensor inlet temperature on the LED monitor and check the temperature difference YES l Check for contact failure o Replace the control board 331 IX Troubleshooting Note1 For the connectors on the board TH11
11. Short circuited pressure diately before start up sensor cable due to torn the operation immediate outer rubber ly stops 4 A pin on the male connec tor is missing 5 Disconnected wire 6 Failure of the low pressure input circuit on the control ler board 2 2 IX Troubleshooting Error Code SOF CeO Mane AIOT Cause Check method and remedy detection method 1302 Abnormal high pressure 1 outdoor unit 1 If the pressure of 3 87MPa 561 psi or higher is detected by the pressure sensor during operation the first detection the outdoor stops once turns to anti restart mode for 3 minutes and restarts after 3 minutes automatically 2 If the pressure of 3 87MP 561 psi or higher is detected by the pressure sensor again the second de tection within 30 min utes after the first stop of the outdoor unit the outdoor unit stops once turns to anti re start mode for 3 min utes and restarts after 3 minutes automati cally 3 If the pressure of 3 87MP 561psila or higher is detected by the pressure sensor the third detection within 30 minutes of the second stop of the outdoor unit the out door unit will make an error stop and the er ror code 1302 will be displayed 4 f the pressure of 3 87MPa 561 psi or higher is detected more than 30 minutes after the stop of the outdoor unit the de tection is regarded as the first detection and the operation de scribed in s
12. add the same amount of oil that is collected from the drain oil plug on the oil balance pipe in the procedure 4 Note The oil to be added must be MEL32 made by Nisseki Mitsubishi When adding oil the oil must not absorb moisture and do not use the oil that is over a year old Do not draw out the oil in the compressor when returning the compressor to find the cause of compressor malfunction 19 Attach the crankcase heater Note Attach the appropriate crankcase heater to the appropriate compressor Attach the soundproof material to the compressor Attach the discharge temperature thermistor and attach the insulation Attach the power source wire to the terminal on the compressor After vacuuming calculate the amount of added refrigerant at factory shipment and the amount of added refrig erant on site and charge the system 24 After reconfirming the power source wiring phase apply a megger attach the terminal cover turn on the main power and check whether the crankcase heater is powered 25 Check that the ball valves both on the liquid and the gas side are open 26 Operate all the indoor units and check whether they run properly 27 If there is something that needs to be improved in the installation or the usage explain that to the customers 20 21 22 23 352 IX Troubleshooting No 1 Compressor Soundproof material No 2 compressor Oil balance pipe joint Drain oil plug Metal fitting 1 Flare n
13. and change the set ting of the capacity code IX Troubleshooting Tor Error source Emor geunitionahe error Cause Check method and remedy Code detection method 7102 Outdoor unit 7105 Outdoor unit 7106 OA processing 7110 Outdoor unit Error in the number of connected units The number of connect ed indoor units is 0 or exceeds the allowable value Address setting error Erroneous setting of OC unit address Attribute setting error Unset unit connection information error The start up of the unit has not completed nor mally in the system to which a transmission booster is connected Number of indoor units connected to the outdoor terminal block TB3 for in door outdoor transmission lines exceeds limitations described below Number of units 1 Total number of indoor units Restriction on t it number of units 1 13 P72 model 1 16 P96 P108 models 1 20 P126 model 1 22 P144 P168 models 1 24 P192 P204 models 1 32 P216 P234 models 2 Total number of LOSSNAY units During auto address start up only 2 Disconnected transmis sion line of the outdoor unit 3 Short circuited transmis sion line When 2 and 3 apply the following display will appear In case of M NET remote controller gt Nothing appears on the display as no power is supplied to the remote controller In the case of MA remote controller gt HO will blink Erroneo
14. connectors are not properly inserted When an error occurs after the components are replaced the wrong wiring is the cause in most cases Check that the wiring is correct the screws are not loosely tightened and the connectors and Faston are not loosely inserted 3 Do not remove or insert inverter connectors with the main power supply on as this will result in damage to the PCB 4 The electric current sensor will be damaged if current flows without the control board being connected Always insert con nectors into the corresponding PCB when running the inverter 2 Inverter output related troubles 1 Perform the following 1 IPM overcurrent breaker Replace the compressor INV Check the com Remove the connector trip board pressor INV CNDR2 on the compressor 4250 Detail code No board error de INV board 101 102 103 104 105 tection circuit Operate the outdoor unit after 106 and 107 DOVE SIOPS 2 Logic error Replace the compressor INV Neer MEATOr Iais 4250 Detail code No board The compressor does not run 111 i i because CNDR2 which out puts the IPM drive signal has 3 ACCT sensor circuit fail Check the resistance of the current been disconnected ure sensor ACCT referring to 5301 Detail code 9 4 8 4 Current Sensor ACCT No 115 and replace the sensor when ab normal Replace the compressor INV board if the ACCT is normal 4 DCCT sensor circuit fail Replace the DCCT sensor ure After replacing the DC
15. is not enough sensor agnosis LED Protection works and compres gt If the accurate pressure is not de sor frequency does not rise due tected check the pressure sensor Re to high discharge temperature fer to the page on Troubleshooting of Protection works and compres Pressure Sensor sor frequency does not rise due Note Lower inlet pressure by the low to high pressure pressure sensor than the actual Pressure drops excessively pressure causes insufficient ca pacity SW1 setting High pressure sensor 12 3 4 56 7 8 9 10 ON Low pressure senso 12 3 4 5 ON 2 Check temperature difference between the evaporating temperature Te and the target evaporating temperature Tem with self diagnosis LED Note Higher Te than Tem causes in sufficient capacity SW1 setting Evaporating temperature Te 123 45 67 8 9 10 ON Target evaporating temperature Tem 12 3 45 67 8 9 10 ON Note Protection works and compressor frequency does not rise even at higher Te than Tem due to high discharge temperature and high pressure At high discharge temperature Refer to 1102 At high pressure Refer to 1302 2 Indoor unit LEV malfunction Refer to the page of LEV troubleshooting 9 Insufficient refrigerant flows due 4 6 to LEV malfunction not enough Opening or protection works and compressor frequency does not rise due to pressure drop Refrigerant leak from LEV on the stopping unit causes
16. tors on the multiple outdoor units are connected to the female power supply switch connector CN40 In the system to which the power supply unit for transmission lines is connected the male power supply connector is connected to the female power supply switch connector CN40 on the out door unit 4 Disconnected M NET transmis sion line on the indoor unit side 5 Disconnected wire between the terminal block for M NET line TB5 of the indoor unit and the in door unit board CN2M or discon nected connector Check method and remedy Same symptom for all units in a NO system with one outdoor unit Check the self diagnosis LED Is the error code 7120 Check for displayed 2and 3 Check 5 NO Check 1 Refer to 4 6 2 Outdoor unit transmission power source circuit BE eOl NO failure judgment for the check method Indoor unit board or MA remote controller failure Correct the error Measure voltages ofthe terminal block for transmission line TB5 on the indoor unit Check 4 303 IX Troubleshooting m Phenomena Cause 3 HO or PLEASE WAIT dis 1 The power for the M NET transmission line is not supplied from the outdoor unit play on the remote controller 2 Short circuited transmission line does not disappear and no op 3 Incorrect wiring of the M NET transmission line on the outdoor unit eration is performed even if the Disconnected wire for the MA remote controller or disconnected l
17. 4 way valve When not powered The electricity runs between the oil separator exit and the heat exchanger in the case of P126 P144 model HEXF between heat exchangers at the front in the case of P168 P234 models and between HEX1b and 2b heat exchanger on the left as you face the front of the unit When powered The electricity runs between the heat exchanger and the accumulator and the valve opens or closes the heat exchanger circuit when cooling or heating Check the LED display and the switching sound to check whether the valve has no faults however it may be occasionally difficult to check by the sound as the switching coincides with 21S4a and 21S4c In this case check the intake and the discharge temperature for the 4 way valve to check that the electricity runs between where and where Do not touch the valve when checking the temperature as it will be hot Do not give an impact from outside as the outer hull will be deformed leading to the malfunction of the inner valve 3 In case of SV1 Bypass valve This solenoid valve opens when powered Relay ON 1 At compressor start up the SV1 turns on for 4 minutes and the operation can be checked by the self diagnosis LED display and the closing sound 2 To check whether the valve is open or closed check the change of the SV1 downstream piping temperature while the valve is being powered Even when the valve is closed high temperature refrigerant flows inside the capillary n
18. 5 Turn off the power source of the outdoor unit for 5 minutes or more and turn it on again If the error is accidental it will run normally If not check the causes 1 4 IX Troubleshooting 2 Grouping of units in a system with multiple outdoor units Error source ad dress Outdoor unit OC BC control ler BC Indoor unit IC No ACK abnormality Error dis play M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC Detection method No ac knowl edgement ACK at BC trans mission to OC No ac knowl edgement ACK atIC transmis sion to BC No ac knowl edgement ACK at RC trans mission to IC Error definition and error detection method The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Same cause as that for system with one outdoor unit Same cause as that for system with one outdoor unit 1 Same causes as 1 5 for sys tem with one outdoor unit 2 Disconnection or short circuit of the transmission line for the out door unit on the t
19. 52C2 normally turns on 4 Compressor failure Compressor open phase or grounding fault Compressor lock 4 Main board failure If none of the items described above is applicable and if the trouble reap pears even after the power is switched on again replace the MAIN board 4116 Motor abnor 1 LOSSNAY 1 Board failure Replace the board The motor keep running even if the power is OFF 2 Motor malfunction Check for the motor and the solenoid The thermal overload re 3 Solenoid switch malfunc switch lay is ON Only for the tion three phase model 2 Indoor unit If detected less than 180rpm or more than 2000rpm the indoor unit will restart and keep running for 3 minutes lIf detected again the display will appear 246 IX Troubleshooting Error Code SOF Ce nO ANE AMOT Cause Check method and remedy detection method 4220 Bus voltage If Vdc 150V or less is de 1 Power supply environment Check whether the unit makes an instanta 4225 drop tected during Inverter op neous stop when the detection result is ab Detail code eration S W detection normal of a power failure occurs l 08 Check whether the power voltage is 150V or less across all phases 2 Voltage drop detected In the case of 4220 Measure voltages of the male connector CNDC2 on the compressor INV board gt Replace the INV board when there is no voltage drop gt Check the followings when t
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21. ACK Same cause as that for system with one outdoor unit Same as grouping of units in a sys tem with multiple outdoor units 1 Error occurrence on some IC 1 Same cause as that for system with one outdoor unit 2 Error occurrence on all IC in the system with one outdoor unit 1 Total capacity error 7100 2 Capacity code error 7101 3 Error in the number of connect ed units 7102 4 Address setting error 7105 5 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 6 Turn off the power source of the outdoor unit 7 Malfunction of electrical system for the outdoor unit 3 Error occurrence on all IC 1 Same causes as 1 7 de scribed in 2 2 The male power supply connec tors on 2 or more outdoor units are connected to the female power supply switch connector CN40 for the transmission line for centralized control 3 Disconnection or shutdown of the power source of the power supply unit for transmission line 4 System controller MELANS malfunction 261 Check method and remedy Same remedy as that for system with one outdoor unit Same remedy as that for grouping of units in a system with multiple outdoor units Same remedy as that for system with one outdoor unit 1 Check the LED display for troubleshoot ing on the outdoor unit gt lf an error is found check the ch
22. LEV LEV operation The LEV receives pulse signal from the board and the valve is driven by the stepping motor 1 Indoor LEV and BC controller LEV The valve opening changes according to the number of pulses Control board Intermediate connector DC 12V l S 2 Brown 6 T Q Blue Drive circuit 1 oOo a LAA 5 P Brown O oje 143 _ nf te ae x Yellow el Rea orak LAN e aE White ae WOT Connector S cae unit connector CN60 Control board CNLV1 one Note The connector numbers on the intermediate connector and the connector on the control board differ Check the color of the lead wire to judge the number Pulse signal output and valve operation Pulse signal output and valve operation Output pulses change in the following orders when the 2 Valve is closed 1 gt 2 gt 3 gt 4 gt 1 Valve is open 4 gt 3 gt 2 gt 1 gt 4 Output state 1 When the LEV opening angle does not change all the output phases will be off 2 When the output is open phase or remains ON the motor cannot run smoothly and rattles and vibrates When the power is turned on the valve closing signal of 2200 pulses will be output from the indoor board to LEV to fix the valve position It must be fixed at point When the valve operates smoothly no sound from LEV or no vibration occurs however when the pulses change from to in the chart or the valve is locked a big
23. MELANS When MELANS is used HO display on the remote controller will disappear when the indoor unit and the local remote controller M NET remote controller are grouped If HO does not disappear after the registration check the 11 13 308 IX Troubleshooting mi Phenomena Cause 4 88 appears on the remote controller when the address is registered or confirmed An error occurs when the ad dress is registered or confirmed common 1 A wrong address is set to the unit to be coupled 2 The transmission line of the unit to be coupled is disconnected or is not connected 3 Circuit board failure of the unit to be coupled 4 Improper transmission line work Generates at interlocking regis tration between LOSSNAY and the indoor unit 5 The power of LOSSNAY is OFF Generates at confirmation of con trollers used in the system in which the indoor units connected to different outdoor units are grouped 6 The power of the outdoor unit to be confirmed has been cut off 7 The transmission line for central ized control TB7 is disconnect ed 8 When the indoor units connected to different outdoor units are grouped without MELANS the male power supply connector is not connected to the female pow er supply switch connector CN40 for the transmission line for centralized control 9 The male power supply connec tors on 2 or more outdoor units are connected to the female pow er supply switch conn
24. The male power supply connec tors on 2 or more outdoor units are connected to the female power supply switch connector CN40 for centralized control If an error occurs after the unit runs normally once the following causes may be considered Total capacity error 7100 Capacity code error 7101 Error in the number of connected units 7102 Address setting error 7105 Same causes as 1 5 for system with one outdoor unit Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized control line connection TB7 When multiple outdoor units are con nected and the power source of one of the outdoor units has been shut off The male power supply connector of the outdoor unit is not connected to the female power supply switch connector CN40 The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch con nector CN40 for centralized control Check method and remedy 1 Turn off the power source of LOSSNAY for 5 or more minutes and turn it on again If the error is accidental it will run normally If not check the cause 2 2 Check the causes of 1 5 If the cause is found correct it If no cause is found check 3 3 Same cause as that for indoor unit de scribed in 3 1 Turn off the power source of LOSSNAY for 5 or more minutes and turn it on again If the error is accidental it will
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26. a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK ol Error dis Detection source ad Check method and remedy eee play method system M NET re No ac 1 Error display on some displays on Check 1 3 on the left controller mote con knowl M NET remote controllers SC troller RC edgement 1 Faulty wiring of the transmission MA remote ACK atIC line for M NET remote controller controller transmis 2 Disconnection or contact failure MA sion to SC of the transmission connector for M NET remote controller 3 M NET remote controller failure 2 Error occurrence on all IC in the 1 Check the LED display for troubleshoot system with one outdoor unit ing on the outdoor unit 1 An error is found by the outdoor gt If an error is found check the check unit code definition and correct the error Total capacity error 7100 gt If no error is found check the cause Capacity code error 7101 2 Error in the number of connect 2 Check 2 4 on the left AB ed units 7102 Address setting error 7105 2 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 3 Turn off the power source of the outdoor unit 4 Malfunction of electrical
27. an error stop will be made and 5111 5112 5115 or 5116 will be dis played 1 2 3 4 scribed above is not detected during de frost or 3 minutes after the operation mode is changed TH11 TH12 TH15 TH16 70 C 158 F and above Short is detection 110 C 230 F and above 0 57 KQ 110 C 230 F and above 0 4 kQ 110 C 230 F and above 1 14 kQ Replace compressor INV board or fan INV board under part 4 Trouble shooting principal parts for error codes related to the inverter Check thermistor resistance Check lead wire Check for torn wire coating Check connector Check the intake temperature of the sensor with the LED monitor When the temperature is far different from the actual temperature replace the control board Open detection 40 C 40 F and below 130 KQ 40 C 40 F and below 130 KQ 0 4kQ 40 C 40 F and below 130 kQ 1 40 C 40 F and below 130 KQ Error Code PROT OCNANOI ANA mer Cause Check method and remedy detection method High pressure 1 sensor out door unit If the high pressure sensor detects 0 098MPa 14psi or less during the opera tion the outdoor unit stops once turns to anti restart mode for 3 minutes and restarts after 3 minutes when the detected high pressure sensor is 0 098MPa 14psi or more High pressure sensor fail ure 3 Torn wire 8 Torn wir
28. an adverse effect on health It may also result in food spoilage Only use specified cables Securely connect each ca ble so that the terminals do not carry the weight of the Properly install the unit according to the instructions in cable the installation manual Improperly connected or fixed cables may produce heat Improper installation may result in water leakage electric and start a fire shock smoke and or fire Take appropriate safety measures against strong Have all electrical work performed by an authorized winds and earthquakes to prevent the unit from falling electrician according to the local regulations and in structions in this manual and a dedicated circuit must If the unit is not installed properly the unit may fall and be used Cause serious injury to the person or damage to the unit Insufficient capacity of the power supply circuit or improper Do not make any modifications or alterations to the installation may result in malfunctions of the unit electric unit Consult your dealer for repair shock smoke and or fire Improper repair may result in water leakage electric shock smoke and or fire Do not touch the heat exchanger fins The fins are sharp and dangerous WARNING Securely attach the terminal block cover panel to the After completing the service work check for a gas leak oo If leaked refrigerant is exposed to a heat source such as a If the terminal block cover panel is not
29. and TH12 are connected to CN10 and TH15 and TH16 are connected to CN11 Disconnect the connector in trouble and check the sensor of each number Note 2 3 1 Pull out the sensor connector from the I O board Do not pull the sensor by holding the lead wire 2 Measure the resistance with such as a tester 3 Compare the measured value with that of shown in the figure below When the result is 10 it is normal Note4 Check the self diagnosis switch Outdoor control board SW1 Measurement data SW1 setting value 1 2 345678910 ON Liquid inlet temperature 123 45 6 7 89 10 oN a i NU G GA Bypass outlet temperature Standard main 12345678910 Bypass inlet temperature 12345678910 ON Bypass inlet temperature 123 45 6 7 89 10 ON Bypass outlet temperature 123 45 6 7 89 10 ON Bypass inlet temperature Tr 567 as Bypass outlet temperature Bypass inlet temperature ELEL 332 IX Troubleshooting 3 Troubleshooting flow chart for LEV Solenoid valve 1 LEV No cooling capacity No heating capacity Note 1 Check whether the electric expansion valve and the solenoid valve connector are not disconnected or not loose NO Fault is found Repair the fault Run the cooling operation or the heating operation in the system in trouble only in one system i C
30. appeared on the display on the remote controller indicates the controller which did not provide the response ACK 1 Contact failure of transmission line of OC or IC 2 Decrease of transmission line voltage signal by exceeding ac ceptable range of transmission wiring Farthest 200 m 656ft or less Remote controller wiring 10m 656ft or less 3 Erroneous sizing of transmission line Not within the range below Wire diameter 1 25mm AWG 16 or more 4 Indoor unit main board failure 1 When IC unit address is changed or modified during op eration 2 Faulty or disconnected IC trans mission wiring 3 Disconnected IC connector CN2M 4 Indoor unit board failure 5 M NET remote controller failure 1 The power source of LOSSNAY has been shut off 2 When the address of LOSSNAY is changed in the middle of the operation 3 Faulty or disconnected transmis sion wiring of LOSSNAY 4 Disconnected connector CN1 on LOSSNAY 5 Controller failure of LOSSNAY 1 Faulty transmission wiring at IC unit side 2 Faulty wiring of the transmission line for M NET remote controller 3 When the address of M NET re mote controller is changed in the middle of the operation 4 M NET remote controller failure 258 Check method and remedy Turn off the power source of the outdoor unit and turn it on again If the error is accidental it will run normally If not check the causes 1 4
31. automatically even if the power source is reset Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 239 IX Troubleshooting Error Code ene ee non anG ANON Cause Check method and remedy detection method 1102 Abnormal dis 1 If the discharge tem 1 Gas leak gas shortage Refer to the page on refrigerant charge air tem perature of 120 C amount evaluation porarure P40 TOn mOra IS ge 2 Overload operation Check operating conditions and op tected during the above operation the o status of indoor outdoor first detection the outdoor unit stops once turns to anti re start mode for 3 min utes and restarts after 3 minutes automati 3 LEV failure on the indoor Perform a cooling or heating opera unit tion and check the operation 4 LEV1 failure on the out Cooling LEV on the indoor unit door unit LEV1 Heating LEV on the indoor unit cally Refer to the page on troubleshooting 2 If the discharge tem LEV perature of 120 C 248 F or more is de 9 Closed ball valve Confirm that the ball valve is fully tected again the sec open ond detection within 6 Outdoor fan including fan Check the fan on the outdoor unit 30 minutes after the parts failure motor failure Refer to the section on troubleshoot second stop of the or fan controller malfunc ing the outdoor unit fan outdoor unit described tion abo
32. board CND2 Faulty wiring YES NO Check the fuse F01 on the G A board YES NO 19 255 NO YES YES Replace the diode stack NO Repair wiring Replace the fuse Replace the rush current protection resistor Turn on the power again 349 IX Troubleshooting 5 Refrigerant Leak 1 Leak spot In the case of extension pipe for indoor unit Cooling season 1 Mount a pressure gauge on the service check joint CJ2 on the low pressure side 2 Stop all the indoor units and close the liquid ball valve BV2 inside the outdoor unit while the compressor is being stopped 3 Stop all the indoor units turn on SW3 6 on the outdoor unit main board while the compressor is being stopped Pump down mode will start and all the indoor units will run in cooling test run mode 4 In the pump down mode SW3 6 is ON all the indoor units will automatically stop when the low pressure LPS reaches 0 382MPa 55psi or less or 15 minutes have passed after the pump mode started Stop all the indoor units and compressors when the pressure indicated by the pressure gauge which is on the check joint CJ2 for low pressure service reaches 0 284MPa 41psi or 20 minutes pass after the pump down operation is started 5 Close the gas ball valve BV1 inside the outdoor unit 6 Collect the refrigerant that remains in the extended pipe for the indoor unit Do not discharge refrigerant into the atmosphere
33. controller are not grouped 12 Disconnected transmission line for centralized control TB7 of the outdoor unit 13 In the system to which the power supply unit for transmission lines is connected the male power supply connector is connected to the female power supply switch connector CN40 on the out door unit Check method and remedy Without using MELANS Are all the units in the system NO experiencing the same problem Check the address of the M NET remote controller on which HO is displayed Check the address of the outdoor unit A wrong address is Indoor unit 100 set to the M NET remote controller A wrong address is YES set to the outdoor unit Check the address of the Check the centralized centralized Indoor unit to be coupled switch SW2 1 on the outdoor unit M NET remote controller A wrong address is l Wrong switch setting 100 Change it from set to the indoor unit ON to OFF YES aa Measure voltages of the terminal Indoor unit main board failure block for transmission line TB5 on the indoor unit Wrong wiring of the M NET transmission line of the indoor unit Check connection between indoor M NET transmission terminal block TB5 and the male connector CN2M Disconnected connector CN2M NO Indoor unit board or remote controller failure Correct the error 1 When the indoor unit address is set to 1 50 the address will be forcibly set to 100 Using
34. current between 2 CNCT2 ACCT on the compressor Detail code Arms and 2 Arms is de INV board 115 tected during inverter op 2 ACCT sensor failure eration Replace the ACCT sensor 1 Contact failure Check the contact of the connector CNCT DCCT on the compressor DCCT sensor When the bus current of failure less than 18 Apeak is de Detail code tected at startup 6Hz 116 INV board and the contact around the connector on DCCT side 2 Misorientation Check the installation direction of DCCT DCCT sensor failure Replace the DCCT sensor 4 Compressor INV board Replace the compressor INV board failure Preliminary When IPM open damage Disconnected ACCT sen Check the connector CNCT2 con IPM open Dis or disconnected CNCT2 sor nection Check ACCT installation connected is not detected just be state ACCT connec fore INV starts tor Sufficient current is not Detail detected just before star code119 tup 2 Faulty wiring Check CNDR2 connection on the compressor INV board or CNDR1 connection on the G A board 3 ACCT sensor failure Refer to 9 4 8 4 Current sensor ACCT and check the resistance value 4 Disconnected compressor Refer to 9 4 8 2 2 Check for wiring compressor ground fault or coil error 5 Compressor INV circuit Refer to 9 4 8 2 2 Check for in failure verter circuit trouble Refer to 9 4 8 4 Current sensor ACCT ACCT faulty A
35. has a problem or the fan motor runs under open phase or opposite phase The microcomputer detects the open phase or the opposite phase of the main power source however these malfunctions When the only one of the fans is running and the other fan is stopped check the 52F output state on the self diagnosis LED first and check the fan connector and 52F connector misconnection 52F failure or the lead wire disconnection 323 IX Troubleshooting 5 Check Valve Block applicable to the PURY series only By turning on or off SV4a 4d 5a and 5b on and off the refrigerant flows through and Check the LED monitor Valve plug A B and C can be removed with 3 kinds of hex wrenches Refrigerant flow in the heating cycle Refrigerant Circuit Figure P72 P144 models Refrigerant flow in the cooling cycle Solenoid Valves Block EDAEN Check valve block 1 Check valve block 1 oe eS eee aad lt High pressure gas High pressure liquid Refrigerant Circuit Figure P168 P234 models Low pressure gas liquid Check valve block 1 Hex wrench mm s mm 4 952 5 00 5 58 5 67 C 13 89 14 00 15 70 14 93 _ Valve plug Check Valves Block 1 Orifice lt 5 High pressure gas High pressure liquid lt 9 High pressure gas liquid Check valve block 2 P168 P234 models only Check valve block 2 P168 P234 models only 324 IX Troubleshooting 6
36. method and remedy detection method 2503 Drain sensor When a short or an open Thermistor failure Check the thermistor resistance failure is detected during opera Connector contact failure 0 C 82 F 6 0 kohm tion cannot be detected loose connector 10 C 50 F 3 9 kohm during OFF 3 Disconnected wire or par 20 C 68 F 2 6 kohm Short tial disconnected ther 30 C 86 F 1 8 kohm detectable at 90 C mistor wire 40 C 104 F 1 3 kohm 194 F or higher Open detectable at 20 C 4 F or lower 2600 Water leakage Water leaks from the pipes in Check the location of the leak such as the humidifier 2601 Water supply The water tank of the hu Check the amount of supply water cut off midifier is empty Check for the solenoid valve and for Indoor board detection circuit Check the connector contact failure If no fault is found the indoor board is a failure the connection 2 The solenoid valve for hu Check the connector midification is OFF 8 Disconnected float switch float switch Check the connecting Check the connecting part Beni operation of float C for the float switch T Frozen water tank Turn off the power source of the wa ter tank to defrost and turn it on again 4103 Reverse 1 When turning on the 1 Faulty wiring Check whether the phase of the phase open power the operation power supply terminal block TB1 phase cannot be start
37. no grounding is provided Group operation of indoor units connected to different outdoor units One point grounding on one outdoor unit power supply unit Use of MELANS Grounding on the main controller power supply device 2 When an error occurs even though one point grounding is provided Ground the shield on all outdoor units 2 Check the followings when the error 6607 occurs or HO PLEASE WAIT appears on the display on the remote controller 7 e a farthest distance of transmission line is 200m 656ft or longer 8 The types of transmission lines are different 9 Check the state of the choke coil on the transmis sion power supply circuit Error code definition code definition a Remedy a that the farthest distance from the outdoor unit to the indoor unit and to the remote controller is within 200m 656ft Use the specified transmission line Type Shielded wire CVVS CPEVS MVVS For M NET re mote controller Diameter 1 25mm AWG16 or more Remote controller wire 0 3 1 25mm AGW22 16 When resistance of the choke coil L2 is between 0 5 and 2 6 ohm the choke coil is normal When resistance R3 on the outdoor unit MAIN board is 1kohm 5 it is normal Connectors CNS1 and CNS2 must be removed when resistance is measured 10 Indoor unit or remote controller failure Replace the indoor unit controller board or the remote control ler 315 IX Troubleshooting 2 MA remote co
38. not controlled normally 311 Confirm that the characteristic of capacity drop due to piping length The piping pressure loss can be assumed by temperature difference between the heat exchanger inlet temperature TH22 and TH2 Te gt Change the pipe Refer to 1 1 Compressor frequency does not rise sufficiently Refer to the page on re frigerant amount adjustment Check the temperature difference between in front of and behind the place where the foreign object is clogging the pipe up stream side and downstream side When the temperature drops significantly the for eign object may clog the pipe gt Remove the foreign object inside the pipe Check the inlet air temperature and for short cycling Change the environment where the indoor unit is used Check the discharge temperature to deter mine if the refrigerant leaks as it rises if there is a leak Refer to the page of LEV troubleshooting 9 4 6 It most likely happens when there is little dif ference or no difference between TH5 and TH7 Check the thermistor Check wiring IX Troubleshooting a a a a a Although heating operation starts with the normal remote controller display the capacity is not enough 1 Compressor frequency does not rise sufficiently Faulty detection of pressure sensor Protection works and compres sor frequency does not rise due to high discharge temperature Protection works and comp
39. oscilloscope The following conditions must be met 1 Small wave pattern noise must not exist on the transmission signal Minute noise approximately 1V can be gen erated by DC DC converter or the inverter operation however such noise is not a problem when the shield of the transmission line is grounded 2 The sectional voltage level of transmission signal should be as follows Voltage level of the transmission line 0 Vu_ 2 0V or higher Ven 1 3V or below 314 IX Troubleshooting 3 Check method and remedy 1 Measures against noise Check the followings when noise exists on the wave or the errors described in 1 occur Check that the wiring work is per formed accord ing to wir ing specifica tions Check that the ground ing work is per formed accord ing to ground ing speci fications Isolate the transmission line from the power line 5cm 1 31 32 or more Do not insert them in the same Do not insert them in the same conduit 1 The transmission line and the power 208 230 V line are not wired too closely The transmission line must be isolated from another transmis sion line When they are bundled erroneous operation may be caused 2 The transmission line is not bundled with that for another systems 3 The specified wire is used for the transmission line Use the specified transmission line Type Shielded wire CVVS CPEVS MVVS For M NET re mote control
40. refrigerant leaks and piles up around the unit it may be ignited High frequency medical equipment may interfere with the normal operation of the air conditioner or vice versa Do not use the unit to keep food items animals plants wet The unit is not designed to preserve food products When the humidity level exceeds 80 or if the drainage Do not use the unit in an unusual environment system is clogged the indoor unit may drip water Drain wa ter is also discharged from the outdoor unit Install a central Do not install the unit where a large amount of oil or steam ized drainage system if necessary is present or where acidic or alkaline solutions or chemical sprays are used frequently Doing so may lead to a remark able drop in performance electric shock malfunctions smoke and or fire The presence of organic solvents or corrosive gas i e am monia sulfur compounds and acid may cause gas leak age or water leakage Before installing the unit moving and reinstalling the unit and performing electrical work WARNING When installing or relocating the unit make sure that no substance other than the specified refrigerant R410A enters the refrigerant circuit Any presence of foreign substance such as air can cause abnormal pressure rise or explosion CAUTION Properly ground the unit Periodically check the installation base for damage Do not connect the grounding wire to a gas pipe water pi
41. second stop of the outdoor unit the outdoor unit will make an error stop and the error code 1302 will be dis played If the pressure of 3 87MPa 561 psi or higher is detect ed more than 30 minutes after the stop of the out door unit the detection is regarded as the first detec tion and the operation de scribed in step 1 above will start For 30 minutes after the stop of the outdoor unit preliminary errors will be displayed on the LED dis play The outdoor unit makes an error stop immediately when not only the pressure sensor but also the pres sure switch detects 4 15 0 0 15 MPa 601 0 22 psi If the pressure of 0 098MPa 14psi or low er is registered on the pressure sensor immedi ately before start up it will trigger an abnormal stop and error code 1302 will be displayed unit gt Heating 2 Closed ball valve Short cycle on the indoor unit side Clogged filter on the indoor unit Reduced air flow due to dirty fan on the indoor unit fan Dirty heat exchanger of the in door unit Indoor fan including fan parts failure or motor failure Rise in high pressure caused by lowered condensing capacity in heating operation for 2 7 Short cycle on the outdoor unit Dirty heat exchanger of the out door unit 10 Outdoor fan including fan parts failure motor failure or fan controller malfunction Rise in discharge temp by low pressure drawing for 3 6 11 Sole
42. shown in the wiring diagram below 2 Coat the radiation surface of the IPM and diode stack evenly with the grease that is provided with the service parts Apply a thin layer of grease to the entire surface of the back of the IPM and diode stack and screw the module securely into place Wipe off any grease that may get on the wiring terminal to avoid terminal contact failure To compressor Capacitor G A board 346 IX Troubleshooting 9 Control Circuit 1 Control power source function block P72 P144 models AC 208 230 V power source TBI Terminal block for 5201 Noise filter Smoothing capacitor E or 52C1 4 way valve TB7 Terminal block for transmission line for centralized control DC 24 30 V lt O CN40 E control TB7 side i iP lyf TBS indoor transmission 30V transmission block Q Uaia Power supply DC 24 30 V Indoor outdoor M NET transmission line Non polar 2 wire AC 208 230 V To next unit lt lt Indoor unit MA remote controller wiring Non polar 2 wire Solenoid valve ms Power source System AC 208 230 V Control system DC 5 30 V eoon G A board exchanger DIP IPM fan IPM drive circuit I Surge protection 1 Te I 15 V Power supply 12 V Power supply 52C1 Relay LEV Drive circuit DC DC converter Transformer 5 V Power supply 15 V Power supply 5 V Power sup
43. sound occurs Whether a sound is generated or not can be determined by holding a screwdriver against it then placing your ear against the handle Valve closed Valve open Valve opening refrigerant flow rate Fully open 1400 pulses 80 100 pulses 325 IX Troubleshooting 2 Outdoor LEV applicable to the PUHY series only The valve opening changes according to the number of pulses lt Connections between the outdoor MAIN board and LEV1 outdoor expansion valve gt Outdoor MAIN board DC 12V Pulse signal output and valve operation Output phase number 1 2 1 ON OFF 2 ON ON 3 OFF OFF 4 OFF OFF Output state Pulse signal output and valve operation 3 42i5l6l7 18 Output pulses change in the following orders when the Valve is closed 1 gt 2 gt 3 gt 4 gt 5 6 7 8 gt 1 OFF OFF OFF OFF ON ON Valve is open 8 gt 7 gt 6 gt 5 gt 4 gt 3 gt 2 gt 1 gt 8 ON OFF OFF OFF OFF OFF 41 When the LEV opening angle does not change ON ON ON OFF OFF OFF all the output phases will be off 2 When the output is open phase or remains ON OFF OFF ON ON ON OFF the motor cannot run smoothly and rattles and vibrates LEV valve closing and opening operation Valve closed Valve opening refrigerant flow rate S Valve open When the power is turned on the valve closing signal of 520 pulses will be output from the indoor board
44. system with one outdoor unit Same remedy as that for grouping of units in a system with multiple outdoor units Same remedy as that for system with one outdoor unit 1 Check the LED display for troubleshoot ing on the outdoor unit gt lf an error is found check the check code definition and correct the error gt lf no error is found check 2 2 Check 5 7 on the left Check voltage of the transmission line for centralized control 20V or more Check 1 and 2 on the left Less than 20V Check 3 on the left 3 System connected to the system controllers MELANS Error source ad dress M NET re mote con troller failure RC No ACK abnormality Error dis play M NET re mote con troller RC System controller SC system controller SC Detection method No ac knowl edgement ACK at IC transmis sion to RC No ac knowl edgement ACK at MELANS transmis sion to RC IX Troubleshooting Error definition and error detection method The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Same as grouping of units in a sys tem with multiple outdoor uni
45. the entire system outdoor unit extended pipe and indoor unit Do not discharge refriger ant into the atmosphere when it is collected 2 Repair the leak 3 After repairing the leak replace the dryer with the new one and perform evacuation of the entire system and cal culate the standard amount of refrigerant to be added for outdoor unit extended pipe and indoor unit and charge the refrigerant Refer to 8 4 3 6 Compressor Replacement Instructions only P168 P234 types Follow the instructions below when replacing the compressor When replacing the compressor No 1 inverter drive determine if the compressor is malfunctioning or the inverter is malfunc eee one compressor is malfunctioning operate the compressor for approximately an hour in emergency operation mode before the replacement check the items below and replace the compressor after examining whether the return oil circuit is working properly or not Refer to the diagram on the right for the temperature of each section Compressor 4 way valve lt When normal gt p y Oil separator 1 Temperature of A Temperature of C and Temperature of A gt Outdoor temperature 10deg C 18deg F 2 Temperature of B Temperature of C and Temperature of B gt Outdoor temperature 10deg C 18deg F lt When abnormal gt When 1 is abnormal out of range Return oil failure due to SV1 circuit failure gt Replace SV1 circuit When 2 is abnormal o
46. tions Wire length Wire size Number of remote controllers Number of indoor units 4 The remote controller is re moved after the installation with out turning the power source off 5 Noise interference on the re mote controller transmission lines 6 Faulty circuit that is on the in door board and performs trans mission reception of the signal from the remote controller 7 Problems with the circuit on the remote controller that sends or receives the signals from the re mote controller 1 Contact failure of the remote controller lines of MA remote controller or the indoor unit 2 2 or more remote controllers are set to MAIN 3 Overlapped indoor unit address 4 Noise interference on the re mote controller lines 5 Failure to meet wiring regula tions Wire length Wire size Number of remote controllers Number of indoor units 6 Problems with the circuit on the remote controller that sends or receives the signals from the re mote controller 266 Check for disconnected or loose transmission lines for the indoor units or MA remote controllers 2 Confirm that the power is supplied to the main power source and the remote controller line 3 Confirm that MA remote controller s capacity limit is not exceeded 4 Check the sub main setting of the MA remote controllers One of them must be set to MAIN 5 Diagnose the remote controller described in the remote controller in stallati
47. trip in the compressor inverter system The last digit Inverter address system Inverter system 238 2 Responding to Error Display on the Remote Controller 1 PUHY 1 Mechanical system IX Troubleshooting Error Code eno Ce nation ANG AMET Cause Check method and remedy detection method 0403 Serial commu Serial communication er Faulty wiring nication error ror between the main board and the INV board on the compressor and between the main board and the inverter board on the fan Detail code 01 Between the main board and the compressor INV board Detail code 05 Between the main board and the FAN INV board 2 Inverter address switch setting error 3 Transformer failure 4 Compressor INV board failure FAN INV board failure Check for wiring between the con nector CNRS3B on the main board and the connector CNRS1 on the compressor INV board or between the connector CNRS3A on the main board and the connector CNRS2 on the FAN INV board and check contact of the connectors Check for contact of the connector CNAC3 on the main board or of the connector CNTR on the FAN INV board Check the setting for SW2 1 on the inverter board on the compressor Confirm that the SW2 1 on the fan inverter board is set to ON Measure voltages between pins 1 and 3 of the male connector CNTR on the FAN INV board Replace the compressor INV board or the FAN board when the power turns on
48. unit is used 10 Insufficient refrigerant amount Refer to 2 1 Compressor frequency does Protection works and compressor not rise sufficiently frequency does not rise due to low Refer to the page on refrigerant amount ad discharge temperature justment Refrigerant recovery operation is likely to start 11 Compressor failure same as in Check the discharge temperature case of cooling Outdoor unit stops at times The first stop is not considered as an 1 Check the mode operated in the past during operation error as the unit turns to anti restart by displaying preliminary error history mode for 3 minutes as a preliminary on LED display with SW1 error 2 Reoperate the unit to find the mode that Error mode stops the unit by displaying preliminary i Abnormal high pressure error history on LED display with SW1 ii Abnormal discharge air Refer to the reference page for each er temperature ror mode iii Heatsink thermistor failure iv Thermistor failure Display the indoor piping temperature v Pressure sensor failure table with SW1 to check whether the vi Over current break freeze proof operation runs properly vil Refrigerant overcharge and check the temperature Note Frost prevention tripping only under cooling mode may be considered in addition to the above Freeze protection is detected by one or all indoor units Note Even the second stop is not considered as an error when some specified e
49. way switching valve only for P126 P234 models This 2 way valve is closed when powered Check the LED display and the switching sound to check whether the valve has no faults When cooling the switching coincides with 21S4b When it is difficult to check by the sound check the tem perature at the front and the back of the pipe to check whether the refrigerant is flowing Do not give an impact from the outside as the outer hull will be deformed leading to the malfunction of the inner valve 322 IX Troubleshooting 4 Outdoor Unit Fan To check the revolution of the fan check the inverter output state on the self diagnosis LED as the inverter on the outdoor fan controls the revolutions of the fan The revolution of the fan is approximately 600rpm at full speed When starting the fan the fan runs at full soeed for 5 seconds For the 2 fans for P168 P234 models the fan on the right as you face the fan runs at all times and the fan on the left runs when required When heating except for defrost both fans run When setting the DIP SW1 as shown in the figure below the inverter output will appear 100 indicates the full speed and 0 indicates the stopping 1234567 89 10 ON As the revolution of the fan changes under control at the interphase or when the indoor unit operation capacity is low the revolution of the fan may change When the fan does not work or an abnormal vibration occurs the FAN board
50. 08 24 5 An Example of a System to which an M NET Remote Controller is connected 46 6 An Example of a System to which both MA Remote Controller and M NET Remote Controler are CONNECIO eanne a a a a a i 50 71 ARESWICUONS om Pipe Lengteestaer a a a 53 II Outdoor Unit BC Controller Components 1 Outdoor Unit Components and Refrigerant CirCuit cccccccccesseseeeceeeeseeeeeeeeeesseeaeeeeeeeess 67 2 Control Box of the Outdoor Unit saocescesesettanedccctiecesstee cece do scsi oe aen ecepesdnc e Geka 79 Si Outdoor Unit CCU BO AN sc se hace cee ea e ah nas ata ee eaten 81 4 BC Controller Under the Panel isseire E 86 5 Control Boor mihe BC Controller ain saa anechancnas N 88 6 BG Controller Circuit BO aN G wsctcretceccse a e 89 IV Remote Controller 1 Functions and Specifications of MA and ME Remote Controllers cccccseccceseeeeseeeeees 93 2 Group Settings and Interlock Settings via the ME Remote Controller eeees 94 3 Interlock Settings via the MA Remote Controller cccccccccccssseeeeeeeeeeeeeeeeeeeeeeeeeeaaasseseeeess 98 4 Using the built in Temperature Sensor on the Remote Conttroller ccccccccceeseeeeeeeees 101 V Electrical Wiring Diagram 1 Electrical Wiring Diagram of the Outdoor UNit eee ceccceccceeeeseeeeeeeeeeaeeseeeeeeeeeeaeneeeeees 105 2 Electrical Wiring Diagram of the BC Controller ccccccccssseeeeeeeeeeeee
51. 16 INV board and the contact around the connector on DCCT side 2 Misorientation Check the installation direction of DCCT 3 DCCT sensor failure Replace the DCCT sensor 4 Compressor INV board Replace the compressor INV board failure IPM open Dis When IPM open damage Reece ACCT sen Check the connector CNCT2 connec connected or disconnected CNCT2 tion Check ACCT installation state ACCT connec j is not detected just be 2 Faulty wiring Check CNDR2 connection on the tor fore INV starts Sufficient Detail code current is not detected SAARE RR He DOarO Or ONDE connection on the G A board 119 just before startup Refer to9 4 8 4 Current sensor ACCT and check 3 ACCT sensor failure the resistance value 4 Disconnected compressor wiring Refer to9 4 8 2 2 Check for compressor ground fault or coil error 5 Compressor INV circuit Refer to9 4 8 2 5 failure Check the inverter circuit trouble ACCT faulty wir ACCT sensor is not se 1 Wrongly mounted ACCT Refer to 9 4 8 4 ing detection curely mounted sensor Current sensor ACCT Detail code 120 Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 254 2 Transmission error Error Error definition and error detec tee Check method and remedy Code tion method 6201 6202 6600 6601 Remote controller board failure Rem
52. 53 Arms Arms 6 Compressor INV board Check that a voltage of 208 230V is failure and cooling fan fail applied to the compressor INV board connector CNFAN while the inverter ure ee is in operation P216 model P234 model 7 Cooling failure Check the cooling fan operation un der the above operating conditions 8 Current sensor ACCT Refer to 9 4 8 4 failure Current sensor hoe 9 Compressor Inverter cir Refer to 9 4 8 2 4 cuit failure Check whether the inverter is dam aged 10 Compressor failure Check that the compressor has not overheated during operation gt Check the refrigerant circuit oil return section Replace the compressor when no fault is found Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 249 IX Troubleshooting Error Code eno Sennen Ano eror Cause Check method and remedy detection method Heat sink fail When a short or an open 1 THHS sensor failure as for short circuit in THHS sen ure of THHS is detected just Aa oe eee orng pee 2 Contact failure Replace THHS sensor No 01 Com verter operation pressor INV 3 Compressor INV board or Replace compressor INV board or side fan INV board failure fan INV board Detail code No 05 Fan INV side Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter Error C
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54. AY and the indoor unit for 5 minutes or more after changing the ad dress and then turn them on it again Check if power is supplied to the M NET transmission line of the G 50A and cor rect any problem found IX Troubleshooting Error Error definition and error detec Code nated Check method and remedy 6602 Transmission processor hard 1 When the wiring work of or the polarity of either the indoor or outdoor trans mission line is performed or is changed while the power is on the transmitted data will collide the wave shape will be changed and an error will be detect Although 0 was surely trans ed mitted by the transmission pro 2 Grounding fault of the transmission line cessor 1 is displayed on the 3 When grouping the indoor units that are connected to different outdoor units transmission line the male power supply connectors on the multiple outdoor units are connect ed to the female power supply switch connector CN40 4 When the power supply unit for transmission lines is used in the system con nected with MELANS the male power supply connector is connected to the female power supply switch connector CN40 on the outdoor unit 5 Controller failure of the source of the error 6 When the transmission data is changed due to the noise on the transmission line 7 Voltage is not applied on the transmission line for centralized control in case of grouped indoor units connected to different out
55. CCT sensor is not se 1 Wrongly mounted ACCT wiring detec curely mounted sensor tion Detail code120 Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 285 IX Troubleshooting 2 Transmission error Error Error definition and error detec Cales Check method and remedy Code tion method 6201 Remote controller board failure Remote controller failure Replace the remote controller An error occurs when the data cannot be read normally from the nonvolatile memory built in on the remote controller 6202 Remote controller board failure Remote controller failure Replace the remote controller An error occurs when the clock function built in on the remote controller does not work nor mally 6600 Address overlaps Two or more remote controllers for Search for the unit which has the same ad The error is detected when the the outdoor units the indoor units dress with that of the source of the trouble same address is transmitted LOSSNAY and the M NET remote from different units controllers have the same address es When the same address is found turn Note The address attribute off the power of the outdoor unit appeared on the display lt Example gt LOSSNAY and the indoor unit for 5 on the remote controller The error code 6600 01 appeared minutes or more after changing the ad indicates the controller on the display
56. CH12 SV4d 4 1 Applicable to the PURY sereis only When a valve malfunctions check if the wrong solenoid valve coil is not attached the lead wire of the coil is not disconnected the connector on the board is not inserted wrongly or the wire for the connector is not disconnected 1 In case of 21S4a 4 way switching valve About this 4 way valve When not powered The electricity runs between the oil separator exit and the heat exchanger in case of P126 P144 model HEXB between heat exchangers at the rear in case of P168 P234 models between HEX1a and 2a heat exchanger on the right as you face the front of the unit and between the gas ball valve BV1 and the accumulator This circulation is for cooling When powered The electricity runs between the oil separator and the gas ball valve and between the heat exchanger and the accumu lator This circulation is for heating Check the LED display and the intake and the discharge temperature for the 4 way valve to check whether the valve has no faults and the electricity runs between where and where Do not touch the pipe when checking the temperature as the pipe on the oil separator side will be hot Do not give an impact from outside as the outer hull will be deformed leading to the malfunction of the inner valve 2 In case of 21S4b 4 way switching valve only for P126 P234 models About this
57. CT operate 5301 Detail code the outdoor unit again In the case No 116 when the error occurs again re place the compressor INV board The DCCT may be normal 5 IMP open 530 Detail Normal code No 119 2 Disconnect the compressor wir 1 Compressor Meg failure Replace the compressor Check for com ing and check the compressor Error if less than 1 Mohm Check that no liquid refrigerant in pressor ground Meg and coil resistance When no liquid refrigerant the compressor fault or coil er in the compressor ror 2 Compressor coil resis tance failure Coil resistance value of 0 16 ohm 20 C 68 F 340 3 Check whether the inverter is damaged Perform this check if an error occurs immedi ately before or after turning on the compressor 4 Check whether the inverter is damaged Per form this check if an error oc curs during op eration Perform the following 1 Reconnect the connector that was removed in section 1 2 Disconnect the compressor wiring 3 Turn on SW1 1 on the com pressor INV board Operate the outdoor unit after above steps Check the inverter output voltage It is recommended to use the tester used in the 9 4 5 5 IPM troubleshooting when checking the inverter output volt age Measure voltage when the com pressor inverter output frequen cy is stable Turn on the outdoor unit Check the inverter output volt age It is recommended to us
58. IPM is cracked due to Replace the IPM Check the oper Selig ation in 3 or 4 after replacing the IPM In the case of an output voltage im balance or error reoccurrence Re place the G A board In the case of an output voltage imbalance or error reoccur rence after replacement Replace the INV board Check the resistances between 3 Check the resistances Replace the IPM Check the opera each terminal of IPM between each terminal of tion in 3 or 4 after replacing the Refer to 9 4 5 5 for details on IPM IPM IPM troubleshooting In the case of an output voltage im balance or error reoccurrence Re place the G A board In the case of an output voltage imbalance or er ror reoccurrence after replace ment Replace the INV board All normal for items 1 3 Replace the IPM above In the case of an output voltage im balance or error reoccurrence Replace the G A board In the case of an output voltage imbalance or error reoccurrence after replace ment Replace the INV board 6 Remove the wire for the outdoor Fan motor megger failure Replace the fan motor Check the fan fan motor and check the fan Failure when the megger motor ground motor megger and the winding is 1Mohm or less fault or the resistance Fan motor disconnection Standard The winding resistance is approximately several ohm lt varies depending on the temperature or while the inner thermo is operating it will be oo ohm winding
59. If noise exists investigate the noise gt No noise indicates that the error source controller is a failure gt If noise exists investigate the noise Turn off the power source of the outdoor and the indoor units When the power source is turned off separately the micro computer will not be reset and the error will not be corrected gt If the same error occurs the error source controller is a failure IX Troubleshooting 1 System with one outdoor unit 6607 Error source ad dress Outdoor unit OC LOSSNAY LC M NET re mote con troller RC No ACK abnormality Error dis play M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA Detection method No ac knowl edgement ACK at IC trans mission to OC No ac knowl edgement ACK at RC trans mission to IC No ac knowl edgement ACK atIC transmis sion to LC No ac knowl edgement ACK at IC transmis sion to RC Error definition and error detection method The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute
60. N INV board Abnormal VDC Bus voltage abnormality If Same as detail code No 108 Same as detail code No 108 and Detail code Vdc 400V or more or Vdc and 109 of 4220 error 109 of 4220 error 110 160V or less is detected H W detection Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 278 IX Troubleshooting Error Code SHO CoN Orang Scr Cause Check method and remedy detection method 4220 Logic error If only the H W error logic In the case of 4220 Refer to 9 4 8 2 1 4225 Detail code circuit operates and no 1 External noise Replace the a board No 111 identifiable error is de 2 Compressor INV board Refer to 9 4 8 2 5 tected failure Replace DCCT 3 G A board failure 4 IPM failure 5 DCCT failure In the case of 4225 Refer to 9 4 8 2 7 1 External noise 2 FAN INV board failure 4230 Heatsink over In the case of 4230 4235 heat protection When the heat sink temperature THH S1 95 C 203 F or 1 Power supply environment Measure the power supply voltage Ensure that the power supply volt age is 187V or more between each phase In Picea pie 2 Air passage blockage Check that the heat sink cooling air When the heat sink passage is not blocked temperature 3 Faulty wiring Check cooling fan wiring THHS5 85 C i 185 F or higher is 4 THHS failure Check THHS sensor resisto
61. NTENTS IX Troubleshooting Check Code Lisensnummer aaa aA woke waar as 235 Responding to Error Display on the Remote Controller ccccccccsseeeeeeeeeeeeeeeeeeeeeeeeeeeas 239 Investigation of Transmission Wave Shape NoiISe ccsseeeeeeeeeeeeeeeeeeeeeeeeeeaeseeeeeeeeeeaaes 314 Troubleshooting Principal Parts eres wsesmcctatasiractain oesa teat teanase et ebiaacdenldentdanct dededanWaandecddededactends 317 PL CTIO CRAM LOAK ania a taeenlantahtunensnGbetecdehtudanaahin toadettadsauiahaPabds 350 Compressor Replacement Instructions only P168 P234 types ccecccseeeeeeeeeeeeeseeeeees 351 Collecting the Cooling Liquid from the Accumulator Only P168 P234 types 08 353 Servicing the BC Controler sessen o a EE E TE 354 X LED monitor display on the outdoor unit board 1 How to read the LED on the service Monitor ccccceccecececcecececcecececcececaceeceeauseceueenecenaens 361 1 2 3 4 5 6 7 8 IX Troubleshooting Check Code Lists tne nutter thet cece iea ethers N E ee eee 235 Responding to Error Display on the Remote Controller cccccsseeeeeeeeseeeeeeeseeeeeeees 239 Investigation of Transmission Wave Shape Noise essseeeeeeeeeeeeeeeeeeeeeeeaaeseeeeeeees 314 Troubleshooting Principal Parts reves siceisesscs zach eashgrea nce yieccssapyalnnndpouecaespe aeaeseewtcapein ees 317 FCIIO GAN GAM sostes bute Sneiudee deste yiteduadanlenuieditopeuaterme
62. P72 model 1 19 P96 model 1 20 P108 P126 models 1 24 P144 P204 models 1 32 P216 P234 models 1 Total number of indoor units 2 Number of BC 1 P72 P126 models onl controllers 3 Number of Main BC controllers Oor 1 4 Number of Sub BC controllers 0 1 or 2 5 Total number of LOSSNAY units During auto address Start up only 2 The outdoor unit address is set to 51 100 although the address is automatical ly set up MA remote con troller HO appears on the display on MA remote controller 3 Disconnected transmis sion line of the outdoor unit 4 Short circuited transmis sion line When 8 and 4 apply the following display will appear In case of M NET remote controller gt Nothing appears on the display as no power is supplied to the remote controller In the case of MA remote controller gt HO will blink 5 Disconnected transmis sion line on BC controller Erroneous setting of OC unit address The address of outdoor unit is not set to 00 or to 51 100 The address of BC controller is not set to 51 100 299 1 Check whether the number of units connected to the outdoor terminal block TBS for indoor outdoor transmission lines does not exceed the limitation See 1 to 4 on the left Check 2 5 on the left Check whether the transmission line for the terminal block for centralized control TB7 is not connected to th
63. SHA ON GJ9 OUOD aowa y uo p ejds p O S 1u00 aowe aup UO paAe GSp SI LIYM ISVATd JOH aym Yau vo Jamod ayp Burung ayy 305 IX Troubleshooting 2 Incase of M NET remote controller a a a ee Even if the operation button on 1 The power for the M NET trans Check voltage of the transmission terminal the remote controller is mission line is not supplied from block for of the M NET remote controller pressed the display remains the outdoor unit 1 If voltage between is 17V and 30V unlit and the unit does not start running Power indicator does not appear on the screen 2 Short circuit of the transmission line 3 Incorrect wiring of the M NET transmission line on the outdoor gt M NET remote controller failure 2 When voltage is 17V or less gt Refer to 9 4 7 2 Outdoor unit transmission power source circuit unit failure judgment Disconnected wire for the MA re mote controller or disconnected line to the terminal block The indoor transmission line is connected incorrectly to the transmission terminal block for centralized controller TB7 4 Disconnected transmission line on the remote controller 5 Remote controller failure When 2 and 3 apply check code 7102 will be displayed on the self diagnosis LED 306 IX Troubleshooting a a a ee When the remote controller op eration SW is turned on a tem porary operation disp
64. Safety Precautions Before installing the unit thoroughly read the following safety precautions Observe these safety precautions for your safety WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death CAUTION This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or damage to the unit After reading this manual give it to the user to retain for future reference Keep this manual for easy reference When the unit is moved or repaired give this manual to those who provide these ser vices When the user changes make sure that the new user receives this manual Ask your dealer or a qualified technician to install the In the event of a refrigerant leak thoroughly ventilate unit the room Improper installation by the user may result in water leak If refrigerant gas leaks and comes in contact with an open age electric shock smoke and or fire flame poisonous gases will be produced Properly install the unit on a surface that can withstand When installing the All Fresh type units take it into the weight of the unit consideration that the outside air may be discharged ae directly into the room when the thermo is turned off Unit installed on an unstable surface may fall and cause in jury Direct exposure to outdoor air may have
65. ally when the power supply is applied Check for clogged drain pump intake Check whether there is no dust around the drain pump intake Check for clogged drain pipe Check whether there is no clog ging outside of the pipe body Check for return water Pour approximately 1 liter water in the drain pump and start the drain pump When the water level in the drain pan becomes steadily lower stop the pump and check the amount of the return water to the drain pan When a large amount of wa ter returns the gradient of drain pipe may be the rea son Check whether the drain pipe is installed prop erly as the instructions in the installation manual say Furthermore check wheth er the gradient of the unit in stallation is horizontal An error may occur due to re turn water depending on the gradient Target gradient approxi mately 0 5 After checking the above when all normal misdetection of the drain sensor is possible Check the drain sensor Check the resistance value lt Error reset method gt Reset error reset the indoor unit in trouble with the remote controller Same as above lt Error reset method gt Reset the power of the indoor unit in trou ble However the reset with the remote con troller error reset must be made 10 minutes later after the power has been re set All the indoor units must be reset with the remote controller IX Troubleshooting Error Code en eeuniiion ane
66. am pipes of LEV and make sure that there is no temperature difference 3 When LEV is fully closed check that there is no refrigerant flowing sound Note3 Refer to the chart below to judge LEV opening controlled by the values of the differential pressure and of the super heat BC controller LEV basic operation characteristic Malfunction Operation Standards of judgment on Part Content mode mode unit stable operation Inclined to Difference between high ince Heating only Pressure P1 and interme Heating diate pressure P3 is large 0 3 0 4MPa AN Difference between high 44 58psi Inclined to Cooling pressure P1 and interme open main diate pressure P3 is small Cooling only Cooling SH12 is large SH12 lt 20K 36 F main Inclined to close Heating only Heating main Difference between high pressure P1 and interme 0 3 0 4MPa diate pressure P3 is 44 58psi small Cooling only Cooling SC16 and SH12 are small Inclined to main SC16 gt 3K 5 F SH12 gt 3K 5 open Heating only Difference between high Heating pressure P1 and interme main diate pressure P3 is large 0 3 0 4MPa 44 58psi Cooling only Cooling SH22 is large SH22 lt 20K 36 F main Inclined to close Cooling only Cooling SH22 is small SH22 gt 3K 5 F main Inclined to open 334 Self diagnosis LED Measurement data SW1 setting value NU G GA Standard
67. aulty mounting of ther mistor TH11 TH12 Water leakage due to problems with such equipment as a hu midifier 243 Check for water leakage around the humidifier and clogging of outlet of the drain pan IX Troubleshooting Error Code SNO GE MINON ANG ATON Cause Check method and remedy detection method 2502 Drain pump failure The error code blinks on the indoor unit in trouble Drain pump fail ure The error code blinks on all the indoor units in the system with one outdoor unit When the drain sensor detects water or its tip be comes immersed in wa ter during drain pump operation When the drain sensor detects water or its tip be comes immersed in wa ter during drain pump operation on stopping in door units 1 Drain pump malfunction 2 Clogged drain pump intake 3 Clogged drain pipe 4 Return water from drain pipe Improper installation 1 Drain pump malfunction 2 Clogged drain pump intake 3 Clogged drain pipe 4 Return water from drain pipe Improper installation 244 Check for drain pump malfunc tion Check whether there is water in the drain pan When the water level is ap proximately 10mm 13 32 from the bottom of the drain pan the drain pump may be normal Check whether the drain pump operates properly Check whether the resis tance of the drain pump is normal or the drain pump operates normally when the pow
68. bleshooting 2 Grouping of units in a system with multiple outdoor units Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Enor Error dis Detection source ad Check method and remedy dicas play method M NET re M NET re No ac 1 Same causes as 1 4 for sys 1 Turn off the power source of LOSSNAY mote con mote con knowl tem with one outdoor unit for 5 or more minutes and turn it on troller RC troller RC edgement 2 Disconnection or short circuit of again If the error is accidental it will run MA remote ACK atIC the transmission line for the out normally lf not check the cause 2 controller transmis door unit on the terminal block 2 Check the causes of 1 5 If the MA sion to RC for centralized control line con cause is found correct it If no cause is nection TB7 found check 3 3 When multiple outdoor units are 3 Same cause as that for indoor unit de connected and the power source scribed in 3 of one of the outdoor units has been shut off 4 The male power supply connec tor of the outdoor unit is not c
69. ctor and Check the continuity at the points Indoor nections in the check the colors of the lead wires visually where an error occurs Outdoor connector or 2 Disconnect the control board s connector and faulty contact conduct a continuity check using a tester 327 IX Troubleshooting 4 Outdoor LEV coil removal procedure applicable to the PUHY series only LEV component As shown in the figure the outdoor LEV is made in such a way that the coils and the body can be separated Coils 2 Stopper So Lead wire Removing the coils Fasten the body tightly at the bottom Part A in the figure so that the body will not move then pull out the coils toward the top If the coils are pulled out without the body gripped undue force will be applied and the pipe will be bent t Part A O Installing the coils Fix the body tightly at the bottom Part A in the figure so that the body will not move then insert the coils from the top and insert the coil stopper securely in the pipe on the body Hold the body when pulling out the coils to prevent so that the pipe will not be bent If the coils are pushed without the body gripped undue force will be applied and the pipe will be bent Hold the body when pulling out the coils to prevent so that the pipe will not be bent Part A O 328 7 Troubleshooting Principal Parts of BC Controller 1 Pressure sensor Troubleshooting flow chart for pressure sensor START y Not
70. d tester The accurate diode specific resistance cannot be measured with the button battery powered card tester as the ap plied voltage is low Use a low range tester if possible A more accurate resistance can be measured Judgment value reference Black External view Internal circuit diagram 3 P H U mH V Drive circuit D A HA i Drive circuit pB z ON i Temperature i sensor i ce protection maa D ppan E ee eee ee ee ee 345 IX Troubleshooting 6 Diode stack Measure resistances between each pair of terminals on the diode stack with a tester and use the results for troubleshoot ing Refer to 5 Intelligent power module IPM for notes on measurement and tester selection Judgment value reference Black External view P a 5 200 ohm to kaa 4 i Internal circuit diagram Red EE g Kia Baca ic L1 L2 L3 7 Caution at replacement of inverter parts 1 Check for miswiring and loose connections Incorrect or loose wiring of such circuit components as IPM and diode stack may cause the IPM damage Thor oughly check the wiring Retighten all screws upon completion of all other work Connect the IPM control terminal carefully to the G A board as the terminal is very small If the output wire from the IPM to the compressor is connected incorrectly the compressor will be damaged Perform wiring carefully in order of color
71. ditaliees 350 Compressor Replacement Instructions only P168 P234 types ceeecceceeeeeeee eee 351 Collecting the Cooling Liquid from the Accumulator Only P168 P234 types 353 Servicing the BC controller cccsssseeeececeeeeceeeceaaaaeeesseeeeeeeeeeeeeseeeseeaasaaaseeeeeeeeeseeees 354 233 IX Troubleshooting 1 Check Code Lists Searched unit Prelimi Error Code Error code definition Notes 2 pa Cc O O O am BC controller eee Ti tl le bee Indoor unit 2 O O oO D gt O nary error 4300 Serial communication error 4305 Note 0900 a a G Oo te le ae a ee e ae 1302 a ce ot Aa ea suey Ee 2500 ie Rinks oe a no ete an o rara a n erse o C T a a me e orne OTT CORDED O O a a a a K T A S TOT a voltage a Bus voltage n 110 Bus voltage H W detection tt 11 Logie error error flogicerror fF Of 4230 4330 4235 4325 Heatsink overheat protection Note Note 4240 4340 4245 4345 Overload protection Note Note 101 APM error error O T Ff J fo eT PTT et pec ene E O roa iem sorgen TO roa ovement oson Ol Instantaneous overcurrent breaker trip S W de 106 tection KAE OT a 235 O S O Oo code i e 2 ee S n a W a 7 a i o Eeee e a oo a a a e B mi IX Troubl
72. door units or in case of the system connected with MELANS ware error The address attribute ap peared on the display on the remote controller in dicates the controller where an error oc curred Check method and remedy Is the transmission line work performed while the power is on NO Check the power source of the indoor unit NO 208 230V Check the transmission line work is performed and the shielded wire is treated properly YES Turn off the power source of outdoor indoor units and turn them on again Faulty power source work Grounding fault or does the shielded wire contact with the transmission line Improper transmission line work System with the power supply unit for transmission lines Multiple outdoor unit system Confirm that the power supply connector on the outdoor unit is not plugged into CN40 Single outdoor unit system Confirm that the power supply connector on the outdoor unit is not plugged into CN40 Is the male power supply connector connected to the female power supply Is the male power supply connector switch connector CN40 on only one of the outdoor unit Tightly reconnect the male power supply connector to the female power supply switch connector CN40 connected to the female power supply switch connector CN40 Disconnect the male power supply on CN40 and connect it to CN41 Investigation into the For the investigation method follow transmission line n
73. e 1 Check whether the pressure sensor or the connectors of P1 and P3 are not disconnected not loose or not connected wrongly i Operating at the moment YES Note 2 On the self diagnosis monitor measure Outdoor high pressure 63HS e Outdoor low pressure 63LS e BC controller pressure P1 liquid side and P3 intermediate part Check whether the result is 63HS gt P12 P3 gt 63LS lt a f YES All the compressors of the outdoor units to which the BC controller is connected are stopped 10 minutes or longer after lt g j Pe ope e NO i Check P1 and P3 on the self diagnosis LED and check that the detected pressure is 0 098MPa 14psi or less Check that the difference between each detected pressure is 0 098MPa 14psi or less i NO is Pd gt PI P3 gt Ps YES YES Both the board and the pressure sensor are normal Check whether the refrigerant pipe and the transmission line are connected correctly between the indoor unit and the BC controller transmission line YES Fix the relation between the refrigerant piping and the Repair the fault i Check whether the refrigerant pipe and the transmission line are connected correctly between the indoor unit and the BC controller 329 IX Troubleshooting Fix the relation between the refrigerant piping and the transmission line Note 3 Check whether the contact of the pressure sensor conn
74. e A Correct the error 1 Refer to the service handbook for the indoor unit Simple checking Procedures for individual components 307 IX Troubleshooting m Phenomena Cause 3 HO display on the remote Without using MELANS controller does not disappear 1 Outdoor unit address is set to 00 and no operation is performed A wrong address is set A wrong address is set to the indoor unit to be coupled with the remote controller even if the button is pressed 100 must be subtracted from the address of the M NET remote controller A wrong address is set to the M NET remote controller 100 must be added to the address of the indoor unit Faulty wiring of the terminal block for transmission line TB5 of the indoor unit in the same group with the remote controller The centralized control switch SW2 1 on the outdoor unit is set to ON Disconnection or faulty wiring of indoor unit transmission line Disconnection between the terminal block for M NET line connection TB5 of the indoor unit and the male connector CN2M The male power supply connectors on 2 or more outdoor units are connected to the female pow er supply switch connector CN40 for the transmission line for centralized control Outdoor unit main board failure Indoor unit board failure 10 Remote controller failure Interlocking control with MELANS 11 No group registration is made using MELANS The indoor unit and the M NET remote
75. e coating Cr a 4 A pin on the male connec Pressure drop due to re Oa leak Refer to the page on the trouble shooting of He high pressure sen sor 9 4 If the high pressure sensor detects 0 098MPa 14psi or less just before the re start the outdoor unit makes an error stop and the error code 5201 will appear During 3 minute anti re start mode preliminary er rors will be displayed on the LED display Aerror is not detected for 3 minutes after the compres sor start during defrost op eration or 3 minutes after defrost operation tor is missing or contact failure 6 Disconnected wire Disconnected wire Fenn High pressure sensor input circuit failure on the main board 283 IX Troubleshooting High pressure sensor failure BC controller Error Code Geniiion ang armor Cause Check method and remedy detection method 5201 Liquid side When the pressure of 1 High pressure sensor fail Refer to the page on the troubleshooting of 4 06MPa 589psi or more ure the high pressure sensor 9 4 1 is detected by the pressure 5 5203 Intermediate sensor an error code e drop due to a 5201 or 5203 will be 3 Torn wire coating displayed However allele 4 Apin on the male connector is ror stop is not made and missing or contact failure backup operation will be 5 Disconnected wire started by other sensors 6 High pressure sensor input cir cuit failure on the
76. e con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC Detection method No ac knowl edgement ACK at BC trans mission to OC No ac knowl edgement ACK at IC transmis sion to BC No ac knowl edgement ACK at RC trans mission to IC No ac knowl edgement ACK at IC transmis sion to LC No ac knowl edgement ACK at IC transmis sion to RC Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK 1 Contact failure of transmission line of OC or BC 2 Decrease of transmission line voltage signal by exceeding ac ceptable range of transmission wiring Farthest 200 m 656ft or less Remote controller wiring 10m 32ft or less 3 Erroneous sizing of transmission line Not within the range below Wire diameter 1 25mm AWG16 or more 4 Indoor unit main board failure 5 Power circuit failure of outdoor unit 1 When BC controller address is changed or modified during opera tion 2 Faulty or disconnected transmis sion wiring of BC controller 3 Disconnected connector of BC controller CN02 4 Faulty control board of BC control ler 1 When IC unit address is changed or modified during op eration 2 Faulty or d
77. e remote controller with the Corresponds Replace the control board connector of the solenoid valve in trouble is disconnected and check that the control YES y Note 2 board outputs 208 230V Measure the temperature at the upstream and downstream pipes of the solenoid valve When the solenoid valve is ON There is no temperature difference Output 208 230V When the solenoid valve is OFF There is a temperature difference NO Replace the control board Replace the solenoid valve coil YES Faulty judgment of solenoid valve Solenoid valve failure 337 IX Troubleshooting Check whether the BC board output signal corresponds with the solenoid valve operation correspond Note1 SVA SVB SVC SVA SVB and SVC turn on or off according to the indoor unit operation mode Mode aa a oF ore oF or SVM SVM2 SVM1 and SVM2 turn on or off according to the operation mode Pressure differ ential control OFF or ON Pressure dif ferential con trol OFF or ON Pressure differ ential control OFF or ON Note2 SVA SVB SVC Measure the temperature at the upstream and downstream pipes and of SVA Measure the temperature at the upstream and downstream pipes and of SVA 4 BC controller transformer BC controller control board a O o o o CNTR 1 3 about 58 ohm Open phase or shorting CNO03 1 3 about 16 ohm Before measuring the resistance pull out the connector
78. e setting error Port setting error The port with wrong num ber is connected to the indoor unit The model to tal connected to the port is greater than the speci fication 1 Model total of indoor units per each port or per each port merge is greater than the specification Total port number Model total Single branching pA 2 branches merge Fe 2 4 or more indoor units are connected to the same port 3 When two ports are used the port with the smaller number is not connected to the indoor unit 4 For the address of the BC controller Sub 1 or 2 50 is not added to the small est indoor unit address which is connected to the BC controller Sub1 or 2 5 In the system to which multiple BC controllers are connected the indoor unit address connected to the BC controller is not set as shown below i The indoor unit address which is connected to the BC controller main ii The indoor unit address which is connected to the BC controller Sub1 iii he indoor unit address which is connected to the BC controller Sub2 Address setting i lt ti lt iii il and ili can be re versed 300 To operate the OA processing unit using remote controllers for indoor units such as MA remote controller set the DipSW3 1 on the OA pro cessing unit to ON Operation method SW 3 1 Interlock with the indoor unit Direct operation with the MA remote controller Before resetting the por
79. e terminal block for the indoor outdoor transmis sion line TB3 Check that the address of the OC unit and the BC controller is set to 51 100 If the outdoor unit address is out of the allowable range turn off the power of the outdoor unit and set the address again If the BC controller address is out of the allowable range turn off the power of both the outdoor unit and the BC controller and set the address again Error Error source Code 7107 BC controller ae 7110 7111 7113 7117 7130 Error source Outdoor unit Indoor unit OA processing unit Outdoor unit Outdoor unit Outdoor unit IX Troubleshooting Check method and remedy Is there a BC controller Sub Are 4 or more indoor units i lt connected to the same port Port No setting error Adjust the piping connection to the port Change the port No NO Is the model total of indoor lt Cunits connected to the same port greater than the item 1 NO When two ports are used lt s the port with the smallest number Port No setting error connected to the indoor unit Change the port No Change the set indoor unit model capacity code The wrong model YES lt capacity code is set Adjust the piping connection to the port Change the port No Error definition and error detection method Unset unit connection When all power sources are information error turned off after the star
80. e the tester used in the 9 4 5 5 IPM troubleshooting when checking the inverter output volt age Measure voltage when the compressor inverter output fre quency is stable trip 4250 Detail code No 101 102 103 104 105 106 and 107 The voltage imbalance across all wiring There is a high possibility of an inverter circuit error if the voltage imbalance across all wiring is great er than the larger of the values represented by 5 or 5V No voltage imbalance across all wiring The voltage imbalance across all wiring There is a high possibility of an inverter circuit error if the voltage imbalance across all wiring is great er than the larger of the values represented by 5 or 5V No voltage imbalance across all wiring 341 IX Troubleshooting 1 IPM overcurrent breaker Refer to item 5 for inverter circuit trouble See item 2 Proceed to item 5 however if there is no problem in section 2 Replace the compressor if there is no problem in section 5 Refer to item 5 for inverter circuit trouble See item 2 Proceed to item 5 however if there is no problem in section 2 Replace the compressor if there is no problem in section 5 IX Troubleshooting Check whether the IPM screw Terminal screws are ee for loose IPM terminal iat the in terminal is not loose loose screws and tighten them verter circuit Coube Check the exterior of the IPM
81. eck code definition and correct the error gt lf no error is found check 2 2 Check 5 7 on the left Check voltage of the transmission line for centralized control 20V or more Check 1 and 2 on the left Less than 20V Check 3 on the left Error source ad dress M NET re mote con troller RC IX Troubleshooting No ACK abnormality Error dis play M NET re mote con troller RC System controller SC MA remote controller MA system controller SC Detection method No ac knowl edgement ACK atIC transmis sion to RC No ac knowl edgement ACK at MELANS transmis sion to RC Error definition and error detection method The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Same as grouping of units in a sys tem with multiple outdoor units 1 Error occurrence on some IC 1 Same cause as that for system with one outdoor unit 2 Error occurrence on all IC in the system with one outdoor unit 1 An error is found by the outdoor unit Total capacity error 7100 Capacity code error 7101 Error in the number of connect ed units 7102 Address se
82. ector CN40 for the transmission line for centralized control 10 In the system to which MELANS is connected the male power supply connector is connected to the female power supply switch connector CN40 for the trans mission line for centralized con trol 11 Short circuit of the transmission line for centralized control 309 1 Confirm the address of unit to be cou pled 2 Check the connection of transmission line 3 Check voltage of the terminal block for transmission line of the unit to be cou pled i Normal if voltage is between DC 17 and 30V ii Check 4 in case other than i 4 Check for the main power of LOSSNAY 5 Check the power supply of the outdoor unit which is coupled with the unit to be confirmed 6 Check that the transmission line for centralized control TB7 of the out door unit is not disconnected 7 Check voltage of the transmission line for centralized control i Normal when voltage is between 10V and 30V ii Check 8 11 described on the left in case other than i IX Troubleshooting 3 Both for MA remote controller and M NET remote controller ee ee ee Although cooling operation 1 Compressor frequency does not 1 Check pressure difference between the starts with the normal remote rise sufficiently detected pressure by the pressure sen controller display the capacity Faulty detection of pressure sor and the actual pressure with self di
83. ector CN40 on only one of the outdoor unit Tightly reconnect the male power supply connector to the female power supply switch connector CN40 For the investigation method follow System with the power supply unit for transmission lines Confirm that the power supply connector on the outdoor unit is not plugged into CN40 Is the male power supply connector connected to the female power supply switch connector CN40 Disconnect the male power supply on CN40 and connect it to CN41 lt Investigation method of transmission wave shape noise gt Investigation into the cause of the noise Correct the error IX Troubleshooting Error Error definition and error detec Caiet Check method and remedy Code tion method 6603 Transmission circuit bus busy The transmission processor Check transmission wave shape noise on cannot be transmitted as the trans mission line by following lt Investiga 1 Generated error when the short wavelength voltage like tion method of transmission wave shape command cannot be trans noise exists consecutively on noise gt mitted for 4 10 minutes in a the transmission line gt No noise indicates that the error row due to bus busy 2 Error source controller failure source controller is a failure 2 Generated error when the gt If noise exists investigate the noise command cannot be trans mitted to the transmission line for 4 10 minutes in a row due to noise Note The addres
84. ector in trouble is not faulty i ae reS Note 4 Remove the pressure sensor connector from the board and check the pressure Restore contact failure NO OT lt Pressure OMPa 0psi TT l YES Short circuit between connecter pins 2 and 3 on the circuit board and check the pressure ae i 6MPa 870psi pressure lt or more is Sl pressu __ l YES Replace the pressure sensor which detects less than 6MPa 870psi pressure with the pressure sensor which detects 6MPa 870psi or more pressure check the pressure and check whether the detected pressure is displayed normally NO YES Replace the pressure sensor Replace the board IX Troubleshooting Note1 BC controller Phenomena when the pressure sensor is connected wrongly reverse connection of P1 and P3 to the board Symptoms Cooling only Cooling main Heating only Heating main Normal Non cooling SC11 large __ lndoor heating SC small S C11 large Non cooling SC11 large SC16 small Heating indoor Thermo ON SC16 small Indoor heating SC small SC16 small APHM large Especially noise is large A PHM large _ Heating indoor Thermo ONI APHM large Especially noise is large Note2 Check the self diagnosis switch Outdoor control board SW1 Measurement data Symbol SW1 setting value 123 45 6 789 10 Outdoor high pressure 12345678910
85. ed be is normal cause of the open Check the wiring between the pow phase of one of the er supply terminal block TB1 and power lines L1 L2 or the main boards CN20 and L3 CN21 Pin If the above faults are not found the main board is faulty 2 The operation cannot 1 Power supply error Check the input resistance of the be started because of Open phase of power power supply terminal block TB1 the reserve phase of supply voltage one of the power lines Power supply voltage L1 L2 or L3 drop 2 Main board failure 2 Faulty wiring Measure voltages of pin 5 of the Between the power supply male connector CN20 on the terminal block TB1 and main board and between pins 1 the main boards CN20 and 3 of the male connector and 21 CN21 on the main board lf the voltage is not the same as the power supply voltage the wiring is faulty 3 A fuse is blown Check whether the fuses of the main board both F01 and F02 are not blown If the above faults are not found the main board is faulty 4 Main board failure 245 IX Troubleshooting Error Code EION rennon ane ANON Cause Check method and remedy detection method the grace period will 4108 Overcurrent 1 First detection 1 Overload operation that Check the unit working condition protection If 51C2 is started dur exceeds unit use limit appear ing the operation of 4115 Power supply The frequency cannotbe 1 Power supply e
86. eeded 4 Check the sub main setting of the MA remote controllers One of them must be set to MAIN 5 Diagnose the remote controller de scribed in the remote controller instal lation manual OK no problems with the remote controller check the wiring regula tions NO Replace the MA remote control ler 6832 6833 ERC due to noise inter ference lt Go to 5 gt Check wave shape noise on MA re mote controller line by following lt 4 In vestigation method of transmission wave shape noise gt When no problems are found with items 1 through 6 replace the indoor unit board or the MA remote controller The following status can be confirmed on LED1 and 2 on the indoor unit board LED1 is lit The main power source of the indoor unit is turned on LED2 is lit MA remote controller line is being powered IX Troubleshooting 3 System error me Error source SO Conn AN ET Cause Check method and remedy Code detection method 7100 Outdoor unit Total capacity error The model total of indoor units Check the model total capacity in the system with one outdoor code total of indoor units con The model total of indoor unit exceeds the following ta nected units in the system with ble 2 Check the model name capaci one outdoor unit exceeds ty code of the connected indoor limitations unit set by the switch SW2 on indoor unit board ee 14 When the model name set by the switch is different fr
87. eeeeeeeeeeeeeaeneeeeeeeeeees 109 VI Refrigerant Circuit a Remngerant Circuit Figure a teeren ea E EEA 119 i21 Piincipal Parts and FUACHONS iiss crstils aenneren 126 VII Control 1 Functions and Factory Settings of the DipSWitches ccccccssecceceesseeeeeeeeeeeeeeeeeeeseeeeas 139 2 Controlling the Outdoor Unit eee ccccccccsesseeeeeeeeesaeeeeeeeeeeesaeeeseeeeeeesseaeseeeeeessssseeeeeeees 148 3 Controlling BC COnmOnue rac ticssscosecatestearnaceancctasostmosass caslaranteainceounnianetteadeuaraeoatontesagbeemeiacee 164 4 Operation Fow CMAN asa aaae care tia tens cova a S A A stad S S a E A cukors 165 VIII Test Run Mode 1 Items to be checked before a Test RUN ccccccccsssseeeeceeeseceeeseeeeeeeeseeeeeseeseeeeeesssaaeeeensegs 179 2 TeSt RUNMGNOG crane a RA EE EA E Gua E E ante cas asmetwtatanendce athe 180 3 Operating Characteristic and Refrigerant AMOUNL ccccccccssssseeceeeeseeeeeeeeeceeseaaeeeeeeeess 181 4 Adjusting the Refrigerant AMOUNL ccccccssssccecceseeceeseeeeceeesseeseeeesaeeeeeeseseaseeeessaeeeeeseas 182 5 Refrigerant Amount Adjust Mode ccccccssesccceceeseeeeesceeesceeeseeseeeessaeeeceessseaeeeessseaeeeenteas 187 6 The following symptoms are normal cccccseeccceeceeeeeeeeeeeeeeeeeeaeeeeeeeseaeeeeeessaeeeeeeeesaaeeeeeeeas 191 7 Standard Operation Data Reference Data ccccccccccssssssssseeeeeeeeeeeeeeeeeseeeaaaeesseeeeeeeeeeess 192 CO
88. er lt 5 gt Attach a ferrite core to the inverter output wiring Contact the fac tory for details of the service part settings lt 6 gt Provide separate power supply to the air conditioner and other electric appliances lt gt If the error occurred suddenly a ground fault of the inverter output can be considered See 2 3 Contact the factory for cases other than those listed above lt 2 gt Check that the shielded wire is used as the transmission line when it is required and check that the grounding work is performed prop erly on the shielded wire Sudden malfunction as a result of external noise lt 1 gt Check that the grounding work is performed properly lt 3 gt Check that neither the transmission line nor the external connec tion wiring does not run close to another power supply system or does not run through the same conduit pipe Contact the factory for cases other than those listed above 339 IX Troubleshooting Note 1 Due to a large capacity electrolytic capacitor used in the inverter voltage still flows through even after the unit is turned off which may cause electric shock As a result wait for a sufficient length of time 5 10 minutes after the main power is turned off and check the voltage drop at both terminals of the electrolytic condensers 2 The components of the inverter such as IPM will be damaged if the screws for inverter wiring are not tightened tightly or the
89. er current capacity injury 3 Plastic bags may pose a risk of choking hazard to children The use of wrong capacity fuses steel wires or copper Tear plastic bags into pieces before disposing of them wires may result in malfunctions smoke and or fire Do not spray water on the air conditioner or immerse the air conditioner in water Otherwise electric shock and or fire may result Before the test run Turn on the unit at least 12 hours before the test run Do not operate the unit without panels and safety a rds Keep the unit turned on throughout the season If the unit is guart turned off in the middle of a season it may result in malfunc Rotating high temperature or high voltage parts on the unit tions pose a risk of burns and or electric shock To avoid the risk of electric shock or malfunction of the Do not turn off the power immediately after stopping unit do not operate switches with wet hands the operation Keep the unit on for at least five minutes before turning off 20 no IOUEN ng romigerent Sits WIN Dake hands OU the power to prevent water leakage or malfunction ing and immediately after operation During or immediately after operation certain parts of the Do not operate the unit without the air filter unit such as pipes and compressor may be either very cold ie SSC Ge ian nile wien Reey te EEE or hot depending on the state of the refrigerant in the unit fun o y p y at the time To reduce the risk of f
90. er supply is applied 2 Check for clogged drain pump intake Check whether there is no dust around the drain pump intake 3 Check for clogged drain pipe Check whether there is no clogging outside of the pipe body 4 Check for return water Pour approximately 1 liter water in the drain pump and start the drain pump When the water level in the drain pan becomes steadily lower stop the pump and check the amount of the return water to the drain pan When a large amount of water returns the gradient of drain pipe may be the reason Check whether the drain pipe is in stalled properly as the instruc tions in the installation manual say Furthermore check wheth er the gradient of the unit instal lation is horizontal An error may occur due to return water de pending on the gradient Target gradient approximately 0 5 After checking the above when all normal misdetection of the drain sensor is possible Check the drain sensor Check the resistance value lt Error reset method gt Reset error reset the indoor unit in trouble with the remote controller Same as above lt Error reset method gt Reset the power of the indoor unit in trou ble However the reset with the remote con troller error reset must be made 10 minutes later after the power has been re set All the indoor units must be reset with the remote controller IX Troubleshooting Error Code ene gennin ane eror Cause Check
91. er to 3 Check whether 52C1 works nor mally Refer to 4 or check 52C1 con necting piping Check for the diode stack Refer to 5 Check the wiring and the connectors between the CNDC2 G on the com pressor INV board and the CNDC1 on the G A board Replace G A board when no fault is found for the above 1 4 In the case of 4225 Check the followings 1 Check the voltage of CN52C1 on the main board Refer to 3 Check whether 52C1 works normally Refer to 4 Or check 52C1 wire connection Check diode stack failure Refer to 5 Check the wiring and the connectors of the CNVDC on the FAN INV board Replace FAN INV board when no fault is found for the above 1 4 3 Main board failure Check whether AC208 230 V is ap plied to the male connector CN52C1 on the main board during inverter oper ation gt If not applied check the main board and the fuse F01 andF02 Re place the main board when no fault is found 4 52C1 failure Refer to 9 4 8 4 and check the coil resistance check 5 Diode stack failure Refer to 9 4 8 6 and check the di ode stack resistance Bus voltage If Vdc 425V or more is 1 Different voltage connec Check the power supply voltage on the rise detected during inverter tion power supply terminal block TB1 Detail code operation 109 2 INV board failure Replace the INV board when no fault is found In the case of 4220 Compressor INV board In the case of 4225 FA
92. erminal block for centralized control line con nection TB7 3 When multiple outdoor units are connected and the power source of one of the outdoor units has been shut off 4 The male power supply connec tor of the outdoor unit is not con nected to the female power supply switch connector CN40 5 The male power supply connec tors on 2 or more outdoor units are connected to the female power supply switch connector CN40 for centralized control If an error occurs after the unit runs normally once the following causes may be considered Total capacity error 7100 Capacity code error 7101 Error in the number of con nected units 7102 Address setting error 7105 290 Check method and remedy Same remedy as that for system with one outdoor unit Same remedy as that for system with one outdoor unit 1 Turn off the power sources of the out door and indoor units for 5 or more min utes and turn them on again If the error is accidental the will run normally f not check the cause 2 2 Check the causes of 1 5 If the cause is found correct it If no cause is found check 3 3 Check the LED displays for trouble shooting on other remote controllers whether an error occurs If an error is found gt If an error is found check the check code definition and correct the error If no error is found gt Indoor unit board failure IX Troubleshooting 2 Grouping o
93. ertor Cause Check method and remedy detection method 2503 Drain sensor When a short or an open Thermistor failure Check the thermistor resistance failure is detected during opera Connector contact failure 0 C 82 F 6 0 kohm tion cannot be detected loose connector 10 C 50 F 3 9 kohm during OFF 3 Disconnected wire or par 20 C 68 F 2 6 kohm Short tial disconnected ther 30 C 86 F 1 8 kohm detectable at 90 C mistor wire 40 C 104 F 1 3 kohm 194 F or higher Open detectable at 20 C 4 F or lower 2600 Water leakage Water leaks from the pipes in Check the location of the leak such as the humidifier 2601 Water supply The water tank of the hu Check the amount of supply water cut off midifier is empty Check for the solenoid valve and for Indoor board detection circuit Check the connector contact failure If no fault is found the indoor board is a failure the connection 2 The solenoid valve for hu Check the connector midification is OFF 3 Disconnected float switch float switch Check the connecting Check the connecting part Feces operation of float C E for the float switch T Frozen water tank Turn off the power source of the wa ter tank to defrost and turn it on again 4103 Reverse When turning on the 1 Faulty wiring Check whether the phase of the phase open power the operation power supply terminal block TB1 pha
94. eshooting Searched unit Error prelim inary Error code definition detail Prelimi nary error Error Code Notes Fa G O O O am Outdoor unit Indoor unit BC controller LOSSNAY Cooling fan abnormality yyy Suction air temperature TH21 Temperature sensor Return of OA processing failure unit TH4 Discharge air temperature TH11 TH12 mono core ET a a E failure Pipes on the OA process ing unit TH2 Gas side pipe TH23 meee failure Pipes on the OA process ing unit gas side TH3 Pipes on the OA process Temperature sensor ing unit TH1 failure Outside air temperature TH24 5105 1205 Temperature sensor Pipe TH5 failure 5106 1294 Temperature sensor Outside air temperature failure TH6 ailure 5110 1214 Tomperature Sengon I isatsik THHS failure nae a eu liquid inlet lene sensor Ea gt failure pn oT BS E rae stn pena Ppp fp ene i 3 intermediate TH16 Jol High pressure sensor failure OC HPS a ree BC controller 63HS 5203 BC controller intermediate pressure sensor 63HS3 5101 5102 5103 5104 236 p lt O o iq wn z O O r Searched unit Error prelim inary Error code definition detail code 115 ACCT sensor failure 116 DCCT sensor failure 5301 4300 117 ACCT sensor circuit failure Note Note 118 DCCT sen
95. etting error 7105 2 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 3 Turn off the power source of the outdoor unit 4 Malfunction of electrical system for the outdoor unit 3 Error display on all displays on M Check 1 4 on the left NET remote controllers 1 Same causes as 1 4 de scribed in 2 2 The male power supply connec tor on the outdoor unit is con nected to the female power supply switch connector CN40 for the transmission line for cen tralized control 3 Disconnection or shutdown of the power source of the power supply unit for transmission line 4 System controller MELANS malfunction 294 IX Troubleshooting 4 Errors that are not limited to a particular system Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote control ler indicates the controller which did not provide the response ACK SOn Error dis Detection source ad Check method and remedy E play method Address 1 Although the address of M NET Delete unnecessary information of non ex which remote cont
96. etween DC 8 5 and 12V the remote controller is a failure lf no voltage is applied Check 1 described on the left If the cause is found correct it If no cause is found refer to 2 Remove the wire for the remote control ler from the terminal block TB13 on the MA remote controller for the indoor unit and check voltage among i to ili lf the voltage is between DC 8 5 and 12V Check the 2 iv described on the left lf no voltage is applied Check 1 described on the left If the cause is found correct it If no cause is found check the wire for the remote display output the relay polarity If no further cause is found replace the indoor unit board IX Troubleshooting ee a a 2 When the remote controller op 1 The power for the M NET trans When 2 and 3 apply check code 7102 eration SW is turned on the mission line is not supplied from will be displayed on the self diagnosis operation status briefly ap the outdoor unit LED pears on the display then it 2 Short circuit of the transmission goes off and the display lights line out immediately and the unit 3 Incorrect wiring of the M NET stops transmission line on the outdoor unit Disconnected wire for the MA re mote controller or disconnected line to the terminal block The indoor transmission line is connected incorrectly to the transmission terminal block for centralized controller TB7 The male power supply connec
97. ext to the valve Therefore temperature of the downstream piping will not be low with the valve closed 319 IX Troubleshooting 4 5 In the case of SV2 Bypass valve applicable to the PURY series only This solenoid valve opens when powered Relay ON In the case of heating only or heating main the valve turns on when the low pressure LPS becomes 0 25MPa 36psi or less 5 minutes after the compressor starts To check whether the valve is open or closed check the change of the SV2 downstream piping temperature while the valve is being powered When the valve is open high temperature gas will run Do not touch the pipe when checking the temperature In case of SV3 Bypass valve Only P168 P234 types This solenoid valve opens when powered Relay ON The valve is normally powered while No 2 Comp is being stopped When the discharge temperature of No 1 Comp ex ceeds 110 C 230 F the valve may be turned off To check whether the valve is open or closed check the change of the SV3 downstream piping temperature while the valve is being powered When the valve is open high temperature gas will run Do not touch the pipe when checking the temperature In case of SV4a 4d P72 P144 models SV4a 4d 5a 5b P168 P234 models heat exchanger capacity control applicable to the PURY series only 1 In the case of cooling only one or more valves among SV4a 4d 5a and 5b turn s on depending on the conditio
98. f units in a system with multiple outdoor units Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Error source ad dress LOSSNAY LC M NET re mote con troller RC Error dis play M NET re mote con troller RC MA remote controller MA M NET re mote con troller RC Detection method No ac knowl edgement ACK at IC transmis sion to FU No ac knowl edgement ACK at IC transmis sion to RC Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK 1 Same causes as 1 4 for sys tem with one outdoor unit Interlocked operation between the transmission line and LOSS NAY in the system in which the indoor units connected to differ ent outdoor units are grouped 2 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 3 When multiple outdoor units are connected and the power source of one of the outdoor units has been shut off 4 The male power supply connec tor of the outdoor unit is not con nected to the female power supply switch connector CN40 5
99. fter the item 4 above the indoor unit lev turns from fully closed to slightly open to prevent the refrigerant seal ii Therefore if the power source is turned off within 30 minutes the lev remains fully closed and the refrigerant remains sealed When only the power for the indoor unit is turned off the indoor unit LEV turns from faintly open to fully closed 3 Leak spot In the case of extension pipe for indoor unit Heating season 1 Run all the indoor units in heating test run mode i To run the indoor unit in test run mode turn SW3 2 from ON to OFF when SW3 1 on the outdoor MAIN board is ON ii Change the setting of the remote controller for all the indoor units to the heating mode iii Check that all the indoor units are performing a heating operation 2 Stop all the indoor units and stop the compressor i To stop all the indoor units and the compressors turn SW3 2 from ON to OFF when SW3 1 on the outdoor MAIN board is ON ii Check that all the indoor units are stopped 3 Close the ball valves BV1 and BV2 4 Collect the refrigerant that remains inside the outdoor unit Do not discharge refrigerant into air into the atmosphere when it is collected 5 Repair the leak 6 After repairing the leak perform evacuation of the extension pipe for the indoor unit and open the ball valves BV1 and BV2 to adjust refrigerant 4 Leak spot In the case of outdoor unit Heating season 1 Collect the refrigerant in
100. gt or lt 2 gt are not the causes of the problem see 3 1 3 Main power earth leakage breaker trip lt 1 gt Check the earth leakage breaker capacity and the sensitivity cur rent lt 2 gt Meg failure for electrical system other than the inverter lt 3 gt If the cause is not lt 1 gt or lt 2 gt see 3 1 4 Only the compressor does not operate Check the inverter frequency on the LED monitor and proceed to 2 3 if the compressor is in operation 5 The compressor vibrates violently at all times or makes an abnor See 2 3 mal sound Only the fan motor does not operate Check the inverter frequency on the LED monitor and proceed to 2 6 7 if the fan motor is in operation 7 The fan motor shakes violently at all times or makes an abnormal Check the inverter frequency on the LED monitor and proceed to 2 sound 6 7 if the fan motor is in operation Noise is picked up by the peripheral device lt 1 gt Check that power supply wiring of the peripheral device does not run close to the power supply wiring of the outdoor unit lt 2 gt Check that the inverter output wiring is not in close contact with the power supply wiring and the transmission lines lt 3 gt Check that the shielded wire is used as the transmission line when itis required and check that the grounding work is performed prop erly on the shielded wire lt 4 gt Meg failure for electrical system other than the invert
101. gure below If DC5V is applied between the red and the black wires voltage corresponding to the pressure between the white and the black wires will be output and the value of this voltage will be converted by the microcomputer The output voltage is 0 173V per 0 098MPa 14psi The pressure sensor on the body side is designed to connect to the connector The connector pin number on the body side is different from that on the main board side side Main board side 1 8 261 1 6 232 63LS 123 Pressure 0 1 7 MPa 247psi TED Vout 0 5 0 35 V F 1 20174 aT 0 173 V 0 098 MPa 14 psi v 1 0 145 0 8 116 Connector 2 06187 GND black orp Vout White oe 0 0 05 1 15 Do 85 f 35 Vcc DC 5 V Red Output voltage V 318 IX Troubleshooting 3 Solenoid Valve Check whether the output signal from the control board and the operation of the solenoid valve match Setting the self diagnosis switch SW1 as shown in the figure below causes the ON signal of each relay to be output to the LED s Each LED shows whether the relays for the following parts are ON or OFF The circuits on some parts are closed when the relays are ON Refer to the following instructions 12345678910 LD5 12345 6 7 89 10
102. h M NET the con Connect the connecting adapter for nected necting adapter for M NET M NET to the outdoor unit must be connected to the in door unit 269 IX Troubleshooting O OZ OOOO IX Troubleshooting Error Error definition and error detec Caiet Check method and remedy Code tion method 6831 6834 6832 6833 MA communication error or no reception error Communication between the MA remote controller and the indoor unit is not done proper ly No proper data has been re ceived for 3 minutes MA communication error or start bit detection error Communication between the MA remote controller and the indoor unit is not done proper ly No proper data has been re ceived for 2 minutes MA communication error or synchronization recovery error Communication between the MA remote controller and the indoor unit is not done proper ly Failure to detect opening in the transmission path and unable to send signals Indoor unit 3 minutes Remote controller 6 seconds MA communication error or transmission reception H W er ror Communication between the MA remote controller and the indoor unit is not done proper ly An error occurs when the transmitted data and the re ceived data differ for 30 times in a row Contact failure of the remote controller lines of MA remote controller or the indoor unit 2 All the remote controllers are set to SUB 3 Failure to meet wiring regula
103. h is connected to the BC controller Sub YES Change the BC controller Sub address NO Is the address of the indoor unit which is connected to the the BC controller Main smaller than that of the indoor which is connected to the BC controller Sub 1 or 2 Change the indoor unit address or change the BC controller address YES Is the address of the indoor unit which is connected to the the BC controller Main smaller than that of the indoor which is connected to the BC controller Sub 1 or 2 Check method and remedy 1 Check whether the power source of the transmission is turned on 2 Turn off the power sources of outdoor indoor units and trans mission booster and turn them on again Replace the remote controller with the one with built in temperature sensor Check all main board connectors and rectify faulty connection Check for the contact of the connec tor CNTYP1 4 5 on the main board Check the model names of the con nected indoor unit and the BC con troller Check whether the connecting adapter for M NET is not connected to the indoor unit Connect the connecting adapter for M NET to the outdoor unit IX Troubleshooting 4 Troubleshooting according to the remote controller malfunction or the external input error 1 In the case of MA remote controller ee ae re a Even if the operation button on 1 The power is not supplied to the the remote control
104. he intake temperature of the sensor with the LED monitor When the temperature is far different from the actual temperature replace the control board Open detection TH11 TH12 240 C 464 F and above 0 57 KQ 0 C 82 F and below 643 kQ TH5 110 C 230 F and above TH6 110 C 230 F and above 0 4kQ 40 C 10 F and below 130 kQ 0 4kQ 40 C 40 F and below 130 KQ TH7 70 C 158 F and above 1 14kQ 40 C 40 F and below 130 KQ 282 IX Troubleshooting 2 Contact failure Replace THHS sensor Heat sink fail ure Detail code No 01 Com pressor INV side Detail code No 05 Fan INV side Refer to section 8 Inverter When a short or an open of THHS is detected just before or during the in verter operation 3 Compressor INV board or fan INV board failure Temperature sensor failure BC controller Error Code EOL enn ANGEREN Cause Check method and remedy detection method 5111 Liquid inlet 1 TH11 5112 Bypass outlet TH12 5115 LEV3 outlet TH15 LEVS inlet TH16 2 The short or open de Thermistor failure Pinched lead wire Torn wire coating A pin on the male connec tor is missing or contact failure 5 Disconnected wire 6 Thermistor input circuit failure on the main board When a short high temperature inlet or an open low tempera ture inlet of the ther mistor is detected during operation
105. he power on If an error occurs again check 2 Check 3 and 4 on the left gt If the cause is found correct it gt If no cause is found check 3 Check transmission wave shape noise on trans mission line by follow ing lt Investigation method of transmis sion wave shape noise gt Noise is the most possible cause of the error 6602 eee si Troubleshooting IX Troubleshooting Error Error definition and error detec Cauce Check method and remedy Code tion method 6831 6834 6832 6833 MA communication error or no reception error Communication between the MA remote controller and the indoor unit is not done proper ly No proper data has been re ceived for 3 minutes MA communication error or start bit detection error Communication between the MA remote controller and the indoor unit is not done proper ly No proper data has been re ceived for 2 minutes MA communication error or synchronization recovery error Communication between the MA remote controller and the indoor unit is not done proper ly Failure to detect opening in the transmission path and unable to send signals Indoor unit 3 minutes Remote controller 6 seconds MA communication error or transmission reception H W er ror Communication between the MA remote controller and the indoor unit is not done proper ly An error occurs when the transmitted data and the re ceived data differ for 30 times in a
106. heck for THHS sensor resistor 185 F or higher is 5 Compressor INV board Check that a voltage of 208 230V is detected failure and cooling fan fail applied to the compressor INV board ure connector CNFAN while the inverter is in operation 6 Cooling failure Check the cooling fan operation un der the above operating conditions 7 IPM failure Refer to 9 4 8 2 2 Check for compressor ground fault or coil error Refer to 9 4 8 2 5 Check the inverter circuit trouble 248 IX Troubleshooting Error Code Emor Pean anemor Cause Check method and remedy detection method 4250 IPM error When an error signal of 4255 Detail code IPM is detected 101 ACCT overcur When overcurrent break rent breaker 150 Apeak or 60 Arms trip is detected by the current Detail code sensor 102 DCCT over current break er trip Detail code 103 Overcurrent breaker trip Detail code 106 107 IPM short When IPM short damage grounding fault or grounding on the load Detail code side is detected just be 104 fore starting the inverter Overcurrent When a short is detected error due to on the compressor or the short circuited fan motor just before the motor inverter operation Detail code105 4260 Cooling fan In the case of 4260 4265 abnormality When the heat sink temperature THHS1 95 C 203 F or more is detected for 10 or more minutes at in verter startup In the case of 4265 Whe
107. here is a voltage drop Check the voltage of CN52C1 on the main board Refer to 3 Check whether 52C1 works normally Refer to 4 Or check 52C1 connecting piping Check for the diode stack Refer to 5 Check for the wiring and the con nectors between the CNDC2 G on the compressor INV board and the CNDC1 on the G A board Replace G A board when no fault is found for the above 1 4 In the case of 4225 Check the following 1 Check the voltage of CN52C1 on the main board Refer to 3 Check whether 52C1 works normally Refer to 4 Or check 52C1 wire connection Check for diode stack failure Refer to 5 Check the wiring and the connectors of the CNVDC on the FAN INV board Replace FAN INV board when no fault is found for the above 1 4 3 Main board failure Check whether AC208 230V is applied to the male connector CN52C1 on the main board during inverter operation gt lf not applied check the main board and the fuse F01 andFO2 Replace the main board when no fault is found 4 52C1 failure Refer to 9 4 8 4 and check the coil resistance check 5 Diode stack failure Refer to 9 4 8 6 and check the di ode stack resistance Bus voltage rise If Vdc 425V or more is 1 Different voltage connection Check the power supply voltage on the pow Detail code 109 detected during inverter er supply terminal block TB1 operation 2 INV board failure Replace the INV board when no fault is fou
108. ine to the ter button is pressed HO or minal block PLEASE WAIT display will The indoor transmission line is connected incorrectly to the transmission termi normally turn off 5 minutes lat nal block for centralized controller TB7 er after the power on The male power supply connectors on the multiple outdoor units are connected to the female power supply switch connector CN40 In the system to which the power supply unit for transmission lines is connect ed the male power supply connector is connected to the female power supply switch connector CN40 on the outdoor unit 4 Disconnected M NET transmission line on the indoor unit 5 Disconnected wire between the terminal block for M NET line TB5 of the indoor unit and the indoor unit board CN2M or disconnected connector 6 Incorrect wiring for the MA remote controller Short circuited wire for the MA remote controller Disconnected wire for the MA remote controller No 2 and disconnected line to the terminal block Reversed daisy chain connection between groups Incorrect wiring for the MA remote controller to the terminal block for transmis sion line connection TB5 on the indoor unit The M NET transmission line is connected incorrectly to the terminal block TB13 for the MA remote controller 7 The sub main setting of the MA remote controller is set to sub 8 2 or more main MA remote controllers are connected 9 Indoor unit board failure MA remote controller commu
109. installed properly fan heater stove or electric grill poisonous gases may be dust and or water may infiltrate and pose a risk of electric produced shock smoke and or fire Do not try to defeat the safety features of the unit Only use the type of refrigerant that is indicated on the areca Serer ee ewiic T EEE unit when installing or reinstalling the unit Oe ee ee ee een switch by defeating the safety features of these devices or Infiltration of any other type of refrigerant or air into the unit the use of accessories other than the ones that are recom may adversely affect the refrigerant cycle and may cause mended by MITSUBISHI may result in smoke fire and or the pipes to burst or explode explosion When installing the unit in a small room exercise cau Only use accessories recommended by MITSUBISHI tion and take measures against leaked refrigerant reaching the limiting concentration Ask a qualified technician to install the unit Improper instal lation by the user may result in water leakage electric Consult your dealer with any questions regarding limiting shock smoke and or fire concentrations and for precautionary measures before in stalling the unit Leaked refrigerant gas exceeding the lim iting concentration causes oxygen deficiency Consult your dealer or a specialist when moving or re installing the unit Improper installation may result in water leakage electric shock and or fire Precautions f
110. ion wave shape noise gt Noise is the most possible cause of the error 6608 3 System error Error Error definition and error 7100 Outdoor unit Outdoor unit Indoor unit Total capacity error The model total of indoor units in the system with one outdoor unit exceeds limitations Capacity code error The model name capac ity code of the connect ed indoor unit connected is inappropriate The model total of indoor units in the system with one outdoor unit exceeds the following ta ble re s The model name capacity code set by the switch SW2 is wrong The capacity of the indoor unit can be confirmed by the self di agnosis function SW1 opera tion of the outdoor unit 267 IX Troubleshooting Check the model total capacity code total of indoor units con nected 2 Check the model name capaci ty code of the connected indoor unit set by the switch SW2 on indoor unit board When the model name set by the switch is different from that of the unit connected turn off the power source of the outdoor and the indoor units and change the setting of the model name capacity code 1 Check the model name capaci ty code of the indoor unit which has the error source address set by the switch SW2 on indoor unit board When the model name set by the switch is different from that of the unit connected turn off the pow er source of the outdoor and the indoor units
111. is locked makes a small clicking sound Outdoor When the valve makes a closing and opening sound the valve has a problem Disconnected or Measure resistance between the coils red Replace the LEV coils Indoor short circuited white red orange brown yellow brown blue LEV motor coil using a tester They are normal if resistance is 150 10 Measure resistance between the coils red Replace the LEV coils Outdoor white red orange brown yellow brown blue using a tester They are normal if resistance is 46 within 3 Incomple sealing When checking the refrigerant leak from the in If there is a large amount of leak Indoor leak from the door LEV run the target indoor unit in the fan age replace the LEV valve mode and the other indoor units in the cooling mode Then check the liquid temperature TH22 with the self diagnosis LED When the unit Is run ning in the fan mode the LEV is fully closed and the temperature detected by the thermistor is not low If there is a leak however the temperature will be low If the temperature is extremely low compared with the inlet temperature displayed on the remote controller the LEV is not properly sealed however if there is a little leak it is not necessary to replace the LEV when there are no effects to other parts Thermistor a liquid piping temperature detection j Linear Expansion Valve Faulty wire con 1 Check for loose pins on the conne
112. isconnected IC trans mission wiring 3 Disconnected IC connector CN2M 4 Indoor unit board failure 5 M NET remote controller failure 1 The power source of LOSSNAY has been shut off 2 When the address of LOSSNAY is changed in the middle of the oper ation 3 Faulty or disconnected transmis sion wiring of LOSSNAY 4 Disconnected connector CN1 on LOSSNAY 5 Controller failure of LOSSNAY 1 Faulty transmission wiring at IC unit side 2 Faulty wiring of the transmission line for M NET remote controller 3 When the address of M NET re mote controller is changed in the middle of the operation 4 M NET remote controller failure 289 Check method and remedy Turn off the power source of the outdoor unit and turn it on again If the error is acci dental it will run normally If not check the causes 1 5 Refer to 9 4 7 2 Outdoor unit transmis sion power source circuit failure judgment for 5 Turn off the outdoor indoor units for 5 or more minutes and turn them on again If the error is accidental they will run nor mally If not check the causes 1 4 Turn off the outdoor indoor units for 5 or more minutes and turn them on again If the error is accidental they will run nor mally If not check the causes 1 5 Turn off the power source of LOSSNAY and turn it on again If the error is accidental it will run normally If not check the causes 1
113. kohm for 3 minutes When the mistor wire 30 C 86 F 4 3 kohm error is not restored after 4 Unattached thermistor or 40 C 104 F 3 1kohm 3 minutes if restored the contact failure l outdoor unit runs normal l 5104 Outdoor air 5 Indoor board detection Check the connector contact ly the outdoor unit eae temperature makes an error stop circuit failure When no fault is found the indoor Short board is a failure detectable at 90 C 194 F or high er Open detectable at 40 C 40 F or low er Sensor error at gas side cannot be detected un der the following condi tions During heating oper ation During cooling oper ation for 3 minutes after the compressor turns on OA processing unit Error Code Sor CEUNON anoretior Cause Check method and remedy detection method 5104 Outdoor air 1 The connector CN29 is Check the contact of the connector temperature not connected tightly Replace the sensor 2 The outdoor air tempera ture sensor is broken 281 IX Troubleshooting Temperature sensor failure outdoor unit Error Code Eror Connon and Aror Cause Check method and remedy detection method 5101 Discharge Check thermistor resistance TH11 TH12 5105 Piping TH5 5106 Outdoor air temperature TH6 5107 Piping TH7 1 When a short high temperature intake or an open low tempera ture intake of the ther mistor i
114. l code detection circuit just be error detection circuit g lore tae inventer stans il erGroundingiaulekcome Rebro S 1478 2 21 pressor and IPM failure Check for compressor ground fault or coil error Refer to9 4 8 2 5 Check the inverter circuit trouble DCCT sensor When an error value is 1 Contact failure Check the contact of the connector circuit failure detected with the DCCT CNCT on the INV board and the Detail code detection circuit just be contact the connector on DCCT 118 fore the inverter starts side 2 Compressor INV board Refer to 9 4 8 2 1 failure Check the compressor INV board error 3 DCCT failure When no fault is found with items 1 and 2 replace the DCCT sensor and check the polarity of DCCT sen sor 4 Grounding fault of the com Refer to 9 4 8 2 2 pressor and IPM failure Check for compressor ground fault or coil error Refer to9 4 8 2 5 Check the inverter circuit trouble ACCT sensor When the effective out 1 Contact failure Check the contact of the connector failure put current between 2 CNCT2 ACCT on the compressor Detail code Arms and 2 Arms is de INV board 115 tected during inverter op eration 2 ACCT sensor failure Replace the ACCT sensor 1 Contact failure Check the contact of the connector CNCT DCCT on the compressor DCCT sensor When the bus current failure less than 18 Apeak is de Detail code tected at startup 1
115. lay is indicated and the display lights out immediately Check method and remedy Check LED1 on the indoor unit control board isi W When it is lit Check for the change of LED display by operating dip i switch SW1 for self TO hen it is off or cannot be checked 1 The power is not supplied to the indoor unit The main power of the indoor unit AC208 230V is not on The connector on the indoor unit board has come off The fuse on the indoor unit board has melted Transformer failure and disconnected wire of the indoor unit The indoor unit board failure The outdoor MAIN board failure As the indoor unit does not interact with the outdoor unit the outdoor unit model cannot be recognized Check voltage of the power supply terminal on the indoor unit AC208 230V Check the ae on the circuit board Check the main power of the power supply wire Turn on the power again Check 208 230V circuit for short circuit and ground fault Check the connection of the connector Check the resistance value of the transformer Within specification Check self diagnosis function of outdoor unit Changed Check self diagnosis function of outdoor unit after the power on Changed Indoor unit main Accidental board failure error Connector contact failure Check the cause of the disconnected transformer Ground fault on the circuit board Ground fault of the sensor and the LEV Outdoor unit board failur
116. ler Diameter 1 25mm AGW16 or more Remote controller wire 0 3 1 25mm AGW22 16 4 When the transmission line is daisy chained on the indoor unit terminals are the shields daisy chained on the terminals too The transmission is two wire daisy chained The shielded wire must be also daisy chained When the shielded cable is not daisy chained the noise can not be reduced enough 5 Is the grounding of the shield of the transmission line for indoor unit con trol provided on the indoor unit One point grounding must be provided on the outdoor unit If no grounding is provided the noise on the transmission line cannot escape leading to change of the transmission signal 6 Check the treatment method of the shield of the transmission line for cen tralized control When group operation of indoor units connected to different outdoor units is performed provide grounding of the shield of the transmission line for centralized control at the point of out door unit and when the system controller is used provide grounding at the point of the system controller so that the ef fect of noise can be minimized The environment against noise varies depending on the dis tance of the transmission lines the number of the connected units the type of the controllers to be connected or the envi ronment of the installation site Therefore the transmission line work for centralized control must be performed as follows 1 When
117. ler is indoor unit pressed the display remains i The main power of the indoor unlit and the unit does not start unit is not on running Power indicator li The connector on the indoor does not appear on the unit board has come off screen iii The fuse on the indoor unit board has melted iv Transformer failure and dis connected wire of the indoor unit 2 Incorrect wiring for the MA remote controller i Disconnected wire for the MA remote controller or disconnect ed line to the terminal block ii Short circuited MA remote con troller wiring iii Incorrect wiring for the MA re mote controller to the terminal block for transmission line con nection TB5 on the indoor unit iv Reversed connection of the wire for the MA remote control ler and the AC208 230V power wire v Reversed connection of the wire for the MA remote control ler and the M NET transmission line on the indoor unit 3 The number of the MA remote controllers that are connected to an indoor unit exceeds the allow able range 2 units 4 The length or the diameter of the wire for the MA remote controller are out of specification 5 Short circuit of the wire for the re mote display output of the outdoor unit or reversed polarity connec tion of the relay 6 The indoor unit board failure 7 MA remote controller failure 302 1 Measure voltages of the MA remote controller terminal among i to ili If the voltage is b
118. letion memory of the previous ad 1 Address deletion by M NET remote dress The same symptom will appear for the registration with SC controller Delete unnecessary address informa tion using the manual setting function of 2 Although the address of LOSS M NET remote controller Refer to this NAY has been changed after the service handbook 4 2 Group set interlock registration of LOSS tings and interlock settings via the ME NAY is made using M NET re remote controller 1 3 Address dele mote controller the indoor unit is tion keeping the memory of the pre Deletion of connection information of vious address the outdoor unit by the deleting switch Note that this switch deletes all the group information set via M NET re mote controller and all the interlock information of LOSSNAY and the in door unit Turn off the power source of the out door unit and wait for 5 minutes Turn on the dip switch SW2 2 on the outdoor unit main board Turn on the power source of the out door unit and wait for 5 minutes Turn off the power source of the out door unit and wait for 5 minutes Turn off the dip switch SW2 2 on the outdoor unit main board Turn on the power source of the out door unit 264 IX Troubleshooting Error Error definition and error detec Gaee Check method and remedy Code tion method 6608 No response When no response command is returned although acknowl edgemen
119. low 130 kQ TH8 70 C 158 F and above 0 4kQ 40 C 40 F and below 130 KQ ter the previous restart of the outdoor unit the outdoor unit makes an error stop 4 When a short or an open of the thermistor is detected just before the restart of the out door unit the outdoor unit makes an error stop and the error code 5101 5103 5104 5105 5106 5107 or 5108 will appear 5 During 3 minute anti restart mode prelimi nary errors will be dis played on the LED display 6 A short or an open de scribed above is not detected for 10 min utes after the com pressor start during defrost mode or for 3 minutes after defrost mode 5108 SC coil bypass outlet TH8 252 IX Troubleshooting Error Code en eeHniiion ane eror Cause Check method and remedy detection method Overload pro When the greater output 1 Short cycle of the air pas Check that the waste heat from the tection current lac than the sage outdoor unit fan is not short cycled Imax Arms or THHS of more than 90 C 194 F Air passage blockage Check that a cooling air is detected for 10 min passage is not blocke utes in a row Power supply Check whether the power supply Tr T max voltage is 187V or more 4 Faulty wiring Check for cooling fan wiring 5 THHS failure Check for THHS sensor resistor In the case of 4240 THHS1 In the case of 4245 THHS5 P144 model model
120. ltiple outdoor units are connect ed to the female power supply switch connector CN40 4 When the power supply unit for transmission lines is used in the system con nected with MELANS the male power supply connector is connected to the female power supply switch connector CN40 on the outdoor unit 5 Controller failure of the source of the error 6 When the transmission data is changed due to the noise on the transmission line 7 Voltage is not applied on the transmission line for centralized control in case of grouped indoor units connected to different outdoor units or in case of the system connected with MELANS Check method and remedy Is the transmission line work performed while the power is on NO Check the power source of the indoor unit NO 208 230V Check the transmission line work is performed and the shielded wire is treated properly YES Turn off the power source of outdoor indoor units and turn them on again Faulty power source work Grounding fault or does the shielded wire contact with the transmission line Improper transmission line work Single outdoor unit system Investigation into the transmission line noise Noise exist Controller failure of the source of the error 287 Multiple outdoor unit system Confirm that the power supply connector on the outdoor unit is not plugged into CN40 Is the male power supply connector connected to the female power supply switch conn
121. lty if 52C2 normally turns on 4 Main board failure If none of the items described above is applicable and if the trouble reap pears even after the power is switched on again replace the MAIN board 4116 Motor abnor 1 LOSSNAY 1 Board failure Replace the board Th k i ine mowr keep run 2 Motor malfunction Check for the motor and the solenoid 2 ning even if the pow er is OFF 3 ee switch malfunc switch The thermal over load relay is ON Only for the three phase model 2 Indoor unit If detected less than 180rpm or more than 2000rpm the indoor unit will restart and keep running for 3 minutes If detected again the display will appear 2 IX Troubleshooting Error Code EMO GE MNOM ANG Aror Cause Check method and remedy detection method 4220 Bus voltage If Vdc 150V or less is de 1 Power supply environment Check whether the unit makes an instanta 4225 drop tected during Inverter op neous stop when the detection result is ab Detail code eration S W detection normal Ora power failure occurs 08 l Check whether the power voltage is 150V or less across all phases 2 Voltage drop detected In the case of 4220 Measure voltages of the male connector CNDC2 on the compressor INV board gt Replace the INV board when there is no voltage drop gt Check the followings when there is a voltage drop Check the voltage of CN52C on the main board Ref
122. main board 284 IX Troubleshooting Error Code SRON Gennition anie Pror Cause Check method and remedy detection method 5301 ACCT sensor When an error value is 1 Compressor INV board Refer to 9 4 8 2 1 Check the compres circuit failure detected with the ACCT failure sor INV board error detection circuit re coge e foe 2 Ground fault of compres Refer to 9 4 8 2 2 Check for sor and IPM failure compressor ground fault or coil error Refer to 9 4 8 2 5 Check the in verter circuit trouble DCCT sensor When an error value is 1 Contact failure Check the contact of the connector CNCT circuit failure detected with the DCCT on the INV board and the contact the con Detail code detection circuit just be neclor on DCGT sige 118 fore the inverter starts 2 Compressor INV board Refer to 9 4 8 2 1 Check the failure compressor INV board error detec tion circuit 3 DCCT failure When no fault is found with items 1 and 2 replace the DCCT sensor and check the polarity of DCCT sensor 4 Grounding fault of the Refer to 9 4 8 2 2 Check for compressor and IPM fail compressor ground fault or coil er ure ror Refer to 9 4 8 2 1 Check the compressor INV board error detec tion circuit Refer to 9 4 8 2 5 Check the inverter circuit trouble ACCT sensor When the effective out 1 Contact failure Check the contact of the connector failure put
123. monitor Check for a melted fuse Check for short cir cuited cooling FAN MF 4 way valve or actuator like solenoid valve Refer to the page on the trouble shooting of the high pressure sen sor Errcode 2500 Refrigerant overcharge Error definition and error detection method An error can be detected by the discharge temper ature superheat 1 If the discharge SH 10K 18 F or less is detected during oper ation the first detec tion the outdoor unit stops at once turns to anti restart mode for 3 minutes and restarts after 3 minutes auto matically If the discharge SH 10K 18 F or less is detected again within 30 minutes after first stop of the outdoor unit the second de tection the outdoor unit will make an error stop and the error code 1500 is dis played 3 If discharge SH 10K 18 F or less is de tected more than 30 minutes after the out door unit stops and the operation de scribed in step 1 above will start 4 For 30 minutes after the stop of the outdoor unit preliminary errors will be displayed on the LED display Water leakage When the drain sensor detects water or its tip be comes immersed in wa ter IX Troubleshooting 1 Overcharged refrigerant Refer to the page on refrigerant amount evaluation Check the temperature and the pres sure of the sensor with LED monitor 2 Thermistor input circuit failure on the main board 3 F
124. n Check the operation by LED display and operation sound of the solenoid valve 2 In the case of heating only all of SV4a 4d 5a and 5b turn on The operation can be checked by LED display and operation sound of the solenoid valve 3 In the case of cooling main or heating main one or more valves among SV4a 4d 5a and 5b turn s on Check the operation by LED display and operation sound of the solenoid valve 4 Refrigerant flow is as shown in the figure below In the case of cooling only or cooling main mode high temperature high pressure flow is shown and in the case of heating only or heating main mode low temperature gas or liquid flow is shown Refer to the refrigerant circuit figure Turn on or off the solenoid valve depending on the indoor unit capacity or the outdoor temperature Check the LED monitor Remove the SV coil open the lid and check the plung er Pin face tools which are specified in service parts list are required 320 IX Troubleshooting Refrigerant Circuit Figure P72 P144 models J Solenoid Valves Block D Check Valves Block Orifice Bea IX Troubleshooting Solenoid valve block 1 We Refrigerant Circuit Figure P168 P234 models Solenoid Valves Block 2 Q eee E J ooo olenoid Valves Bloc O Solenoid valve block 2 Check Valves Block 1 Orifice Pin face tool Pin face tool V4d SV4c SV4b SV4 Tightening torque 150N m 7 In case of SV5b 2
125. n the heat sink temperature THHS5 85 C 185 F or more is detected for 10 or more minutes at in verter startup In the case of 4250 1 Inverter output related 2 Same as 4230 error In the case of 4255 1 Fan motor abnormality 2 FAN INV board failure 1 Inverter output related In the case of 4250 1 Grounding fault of com pressor 2 Inverter output related In the case of 4255 1 Grounding fault of fan mo tor 2 FAN INV board failure In the case of 4250 1 Short circuited compres sor 2 Output wiring 3 Power supply In the case of 4255 1 Short circuited fan motor 2 Output wiring 3 Power supply Same as 4230 error Same as 4230 error Refer to 9 4 8 2 6 Refer to 9 4 8 2 7 9 4 8 2 Inverter output related troubles Refer to 1 5 Refer to 9 4 8 2 Refer to 9 4 8 2 6 Refer to 9 4 8 2 7 Refer to 9 4 8 2 2 Refer to 4 8 2 6 Refer to Same as 4230 error Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 250 IX Troubleshooting Temperature sensor failure indoor unit Error Code Or peunitien arickerror Cause Check method and remedy detection method 5101 If a short or an open is 1 Thermistor failure Check the thermistor resistor 5102 Liquid pipe detected during thermo 2 Connector contact failure 0 C 32 F 15 kohm
126. nd In the case of 4220 Compressor INV board In the case of 4225 FAN INV board Abnormal VDC Bus voltage abnormality If Vdc Same as detail code No 108 Same as detail code No 108 and Detail code 110 400V or more or Vdc 160V or and 109 of 4220 error 109 of 4220 error less is detected H W detec tion Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 247 IX Troubleshooting Error Code SMOLE CNANON ANG BION Cause Check method and remedy detection method Logic error If only the H W error logic In the case of 4220 Refer to 9 4 8 2 1 and replace Detail code circuit operates and no 1 External noise the G A board No 111 identifiable error is de 2 Compressor INV board Refer to 9 4 8 2 5 and replace tected failure DCCT 3 G A board failure 4 IPM failure 5 DCCT failure In the case of 4225 Refer to 9 4 8 2 7 1 External noise 2 FAN INV board failure Heatsink over In the case of 4230 1 Power supply environment Measure the power supply voltage heat protection When the heat sink Ensure that the power supply volt temperature age is 187V or more between each THHS1 95 C phase ee meets 2 Air passage blockage Check that the heat sink cooling air In the case of 4235 passage is not blocked When the heat sink 3 Faulty wiring Check for cooling fan wiring temperature THHS1 85 C 4 THHS failure C
127. nication circuit 10 Remote controller failure When 2 and 3 apply check code 7102 will be displayed on the self diagno sis LED Check method and remedy system with one outdoor unit Check the self diagnosis LED s the error code 7120 displayed Measure voltages of the terminal block for transmissio line TB5 on the indoor unit Check 4 YES Check for 5 and 6 Correct lt lt Error found gt Replace the M NET remote the error lt lt Error found controller with the MA NO remote controller NO Indoor unit board or MA remote controller failure Check 1 l S Correct Refer to 4 6 2 Outdoor unit transmission power source circuit failure judgment for the check method 304 IX Troubleshooting Flow chart Even if the operation button on the remote controller is pressed the indoor and the outdoor units do not start running aul UOISSIUSULI LAN W 284 104 Y09949 n9119 4uLIa puyo Buluonounyyew y Y20849 z t OL paddojs urew n3119 ueob Wal g oy JO Z ON ewou SI nouo uesa puya p ON YBnouny Y92949 N3119 JUBIOBLYOY L ON z t OL ON ule6e uo pauuny uny yun soopul gt SAA gt alii Jo sounos samod ayy Auo S JSI POO 1011 OY 0 1 J H 10 2099 1018 19 01 U09 OJOWA YN 9y JO G4lM OU BoR deY uoneoyioads y sJaaw ey M ay SN SHA J9 O4JUOD B OW BU JO 41M BU YOBUD A ddns samod t y Y98UD pueog 01
128. noid valve SV1 malfunc tion The by pass valve SV 1 can not control rise in high pres sure 12 Thermistor failure TH5 TH6 13 Pressure sensor failure 14 Failure of the thermistor input circuit and pressure sensor input circuit on the controller board 15 Faulty mounting of thermistor TH5 TH6 16 Disconnected male connector on the pressure switch 63H or disconnected wire 17 Melted fuse F1 or F2 on the controller board 1 Inner pressure drop due toa leakage 2 Pressure sensor failure 3 Shorted circuited pressure sensor cable due to torn out er rubber 4 A pin onthe male connector on the pressure sensor is missing or contact failure 5 Disconnected pressure sen sor cable 6 Failure of the pressure sen sor input circuit on the con troller board 242 check the operation Heating LEV on the indoor unit Refer to the page on troubleshooting LEV Confirm that the ball valve is fully open Check the indoor units for problems and correct them if any Check the fan on the outdoor unit Refer to the section on troubleshoot ing the outdoor unit fan Refer to the section on troubleshoot ing the solenoid valve Check the thermistor resistor Refer to the page on the trouble shooting of the high pressure sen sor Check the temperature and the pres sure of the sensor with LED monitor Check the temperature and the pres sure of the sensor with LED
129. ntroller transmission The communication between the MA remote controller and the indoor unit is performed with current tone burst 1 Symptoms caused by noise interference on the transmission line If noise is generated on the transmission line and the communication between the MA remote controller and the indoor unit is interrupted for 3 minutes in a row MA transmission error 6831 will occur 2 Confirmation of transmission specifications and wave pattern A1 B2 No polarity Across terminal No 1 2 MA remote controller Indoor unit Power supply 8 5V to 12VDC Transmission waveform Across terminal No 1 2 Satisfies the formula VWI DC9 12V 12 msec bit 5 2 Voltage among terminals must Logic 1 Logic 0 Logic 1 Logic 1 be between DC9 and 12 V 12msec 12msec 12msec 12msec 316 IX Troubleshooting 4 Troubleshooting Principal Parts 1 High Pressure Sensor 63HS 1 Compare the pressure that is detected by the high pressure sensor and the high pressure gauge pres sure to check for failure Set the digital display switch SW1 as shown below to display the pressure that is detected by the high pressure sensor on the light emitting diode 12345 6 7 8 9 10 ON 1 While the sensor is stopped compare the gauge pressure and the pressure displayed on self diagnosis LED1 1 When the gauge pressure is between 0 and 0 098MPa 14psi internal pressure is caused due to gas leak 2 When the pressure displa
130. o as not to apply an excess force 6 Close the oil balance pipe attachment point with a cap to prevent the oil from leaking 7 Remove the compressor terminal cover and remove the power supply wiring 8 Remove the discharge temperature thermistor and the sound proof material that is wrapped around the compres Sor 9 Remove the crankcase heater 10 Heat the brazed part of the discharge pipe and the suction pipe and remove the pipes 11 Remove the compressor fixing nuts and the metal fitting 2 3 places on compressor 2 12 Replace the compressor with the service compressor 13 14 Z Braze the discharge pipe and the suction pipe Attach the oil balance pipe to both compressors Attach the oil balance pipe to both compressors After replacing the dryer do not leave the refrigerant circuit open for long time Note When replacing the compressor and when the equal oil pipe is damaged or irreparably deformed after replacing the compressor heat the junction of the equal oil pipe remove the equal oil pipe and braze the service equal oil pipe 15 Close the ball valves in the outdoor unit both on the liquid and the gas side and pressurize up to 4 15MPa 601si with nitrogen from the check joints for high and low pressure service 16 After confirming the airtightness release the nitrogen gas 17 Open the ball valves in the outdoor unit both on the liquid and the gas side and perform vacuuming 18 While vacuuming
131. ode EOL Cen ANG AMOT Cause Check method and remedy detection method High pressure 1 If the high pressure High pressure sensor fail Refer to the page on the trouble sensor out sensor detects ure shooting of the high pressure sen door unit 0 098MPa 14psi or sor 9 4 1 less during the opera J ae Pressure drop due to re tion the outdoor unit erie leak stops once turns to anti restart mode for 3 3 Torn wire 3 Torn wire coating minutes and restarts after 3 minutes when tel 4 A pin on the male connec the detected high tor is missing or contact pressure sensor is failure 0 098MPa 14psi or 6 Disconnected wire Disconnected wire more 2 If the high pressure ees High pressure sensor input sensor detects circuit failure on the main 0 098MPa 14psi or board less just before the re start the outdoor unit makes an error stop and the error code 5201 will appear 3 During 3 minute anti restart mode prelimi nary errors will be dis played on the LED display 4 A error is not detected for 3 minutes after the compressor start dur ing defrost operation or 3 minutes after de frost operation 253 IX Troubleshooting Error Code EON rennon ane Aror Cause Check method and remedy detection method 5301 ACCT sensor When an error value is 1 Compressor INV board Refer to 9 4 8 2 1 circuit failure detected with the ACCT failure Check the compressor INV board Detai
132. oise lt Investigation method of transmission wave shape noise gt Investigation into the Noise exist cause of the noise Controller failure of the source of the error Correct the error 256 IX Troubleshooting Error Error definition and error detec Cae Check method and remedy Code tion method 6603 Transmission circuit bus busy 1 Generated error when the command cannot be trans mitted for 4 10 minutes in a row due to bus busy 2 Generated error when the command cannot be trans mitted to the transmission line for 4 10 minutes in a row due to noise Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred Communication error with the transmission processor Communication error between the main microcomputer on the indoor unit board and the mi crocomputer for transmission Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred The transmission processor cannot be transmitted as the short wavelength voltage like noise exists consecutively on the transmission line 2 Error source controller failure 1 Data is not properly transmitted due to accidental erroneous op eration of the controller of the er ror source 2 Error source controller failure 29 lt No noise indicates that the error source controller is a failure
133. om LEV Connect the LED for check which is as shown in the right figure to the board connector and check that the LED keeps lighting for 10 seconds r E YES Completed YES Replace LEV Oko LED NO Replace the board in trouble IX Troubleshooting 2 Solenoid valve SVA SVB SVC Faulty judgment of solenoid valve Stop the operation of the applied BC remote controller system i Stop the operation Check whether the wire to the solenoid valve is not connected wrongly or the connector is not loose lt Not Repair the fault YES j Run the cooling or heating operation of the refrigerant system of the solenoid valve in trouble j Note 1 Check the operation sound of the solenoid valve to be magnetized at the time of turning on the remote controller Makes a tick sound ae YES Remove the solenoid valve coil and check that there is a suction force There is a suction force YES Note 2 Stop the unit with the remote controller Measure the temperature at the upstream and downstream pipes of the solenoid valve and compare them There is no temperature difference OK There is a temperature difference NO Remove the solenoid valve connector and check that the electricity runs through the solenoid valve coil Check the relay output with the self diagnosis LED and check whether the operation corresponds with the operation mode YES Turn on th
134. om that of the unit connected turn off the power source of the outdoor and the indoor units and change the setting of the model name capacity code Outdoor unit Capacity code error The model name capacity 1 Check the model name capaci Indoor unit code set by the switch SW2 ty code of the indoor unit which The model name capac is wrong has the error source address set ity code of the connect by the switch SW2 on indoor ed indoor unit connected unit board is inappropriate When the model name set by the switch is different from that of the unit connected turn off the pow er source of the outdoor and the indoor units and change the set ting of the capacity code The capacity of the indoor unit can be confirmed by the self di agnosis function SW1 opera tion of the outdoor unit 298 IX Troubleshooting o Error source Error cennin ene iror Cause Check method and remedy Code detection method 7102 Outdoor unit 7105 Outdoor unit BC controller Error in the number of connected units The number of connect ed indoor units is 0 or exceeds the allowable value Address setting error Erroneous setting of OC unit address Erroneous setting of BC controller address Number of units 1 Number of indoor units connected to the outdoor terminal block TB3 for in door outdoor transmission lines exceeds limitations described below Restriction on the number of units 1 15
135. on nected to the female power supply switch connector CN40 5 The male power supply connec tors on 2 or more outdoor units are connected to the female power supply switch connector CN40 for centralized control If an error occurs after the unit runs normally once the following causes may be considered Total capacity error 7100 Capacity code error 7101 Error in the number of con nected units 7102 Address setting error 7105 260 3 System connected to the system controllers MELANS Error source ad dress Outdoor unit OC Indoor unit IC No ACK abnormality Error dis play M NET re mote con troller RC system controller SC MA remote controller MA M NET re mote con troller RC MA remote controller MA system controller SC Detection method No ac knowl edgement ACK at IC transmis sion to OC No ac knowl edgement ACK at RC trans mission to IC No ac knowl edgement ACK at SC trans mission to IC IX Troubleshooting Error definition and error detection method The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response
136. on manual OK no problems with the remote controller check the wiring regula tions NO Replace the MA remote control ler 6832 6833 ERC due to noise interference lt Go to 5 gt 6 Check wave shape noise on MA re mote controller line by following lt 4 In vestigation method of transmission wave shape noise gt 7 When no problems are found with items 1 through 6 replace the indoor unit board or the MA remote control ler The following status can be confirmed on LED1 and 2 on the indoor unit board LED1 is lit The main power source of the indoor unit is turned on LED2 is lit MA remote controller line is being powered IX Troubleshooting 2 PURY 1 Mechanical system Error Code SHOP genion ane cmor Cause Check method and remedy detection method 0403 Serial commu nication error Refer to section 8 Inverter Serial communication er ror between the main board and the INV board on the compressor and between the main board and the INV board on the fan Detail code 01 Between the main board and the compressor INV board Detail code 05 Between the main board and the FAN INV board Faulty wiring 2 Inverter address switch setting error 3 Transformer failure 4 Compressor INV board failure FAN INV board failure 270 Check for wiring between the male connector CNRS3B on the main board and the male connector CNRS1 on the compre
137. on the remote control dress and then turn them on it again where an error oc ler indicates that an error occurred in curred No 1 unit Two or more units whose addresses are 01 exist in the same system 6601 Unset polarity 1 No voltage is applied to the Check if power is supplied to the M NET M NET transmission line that transmission line of the G 50A and cor The error detected when trans G 50A is connected to rect any problem found mission processor cannot dis 2 M NET transmission line to tinguish the polarities of the which G 50A is connected is M NET transmission line short circuited 286 Error Code 6602 Error definition and error detec tion method Transmission processor hard ware error Although 0 was surely trans mitted by the transmission pro cessor 1 is displayed on the transmission line Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred IX Troubleshooting Check method and remedy 1 When the wiring work of or the polarity of either the indoor or outdoor trans mission line is performed or is changed while the power is on the transmitted data will collide the wave shape will be changed and an error will be detect ed 2 Grounding fault of the transmission line 3 When grouping the indoor units that are connected to different outdoor units the male power supply connectors on the mu
138. ooling or heating operation Heating operation Cooling o eration J g op Note 2 Check that LEV1 is fully open Check that LEV1 is fully open NO NO LEV1 is fully open LEV1 is fully open YES Note 3 Check LEV1 YES Note 3 Check whether LEV3 is controlling Check whether LEV 3 is controlled by superheat the value of the differential pressure NO NO Superheat control OK Differential pressure OK YES YES h l i Check LEV3 Check that SVA and SVC are ON Check that SVA and SVC are OFF i f j YES Check SVA and SVC YES Check that SVB is OFF Check that SVB is ON i i YES Check SVB f Completed 333 IX Troubleshooting Note1 BC controller Phenomena when LEV is connected wrongly reverse connection of LEV1 and LEV3 to the board Non cooling Non cooling and non heat Indoor heating SC small Non cooling SH12 small SC11 small ing A PHM large Indoor heating SC small SH16 small branch pipe SH12 small SC11 small A PHM large SC small SH16 large but branch BC controller sound pipe SC small BC controller sound APHM large Note2 Check method of fully open state or fully closed state of LEV 1 Check LEV opening pulse on the self diagnosis LED Outdoor control board SW1 Full open 2000 pulses Fully closed 110 pulses In the case of heating only mode however the pulse may become 110 or more 2 When LEV is fully open measure the temperature at the upstream and downstre
139. ooster and turn them on again Direct operation with the MA remote controller IX Troubleshooting or Error source Emor e enmton OO Cause Check method and remedy Code detection method Indoor unit Remote controller sen The remote controller without Replace the remote controller with OA processing sor failure the temperature sensor the the one with built in temperature unit wireless remote controller or sensor This error occurs when the M NET compact remote the temperature data is controller mounted type is not sent although the re used and the remote controller mote controller sensor is sensor for the indoor unit is specified specified SW1 1 is ON 7113 Outdoor unit Model setting error Short circuit Check all main board connectors short detection Faulty wiring or contact failure and rectify faulty connection 7117 Outdoor unit Model setting error Disconnected connector dis Check for the contact of the connec Open detection connected wire or contact fail tor CNTYP1 4 5 on the main board ure 7130 Outdoor unit Incompatible units The indoor unit that uses only Check the connected indoor unit R22 refrigerant is connect model The check code will ap ed The wrong unit model is Check whether the connecting pear when the indoor connected adapter for M NET is not connected units with different refrig When connecting Mr SLIM A to the indoor unit erant systems are con control wit
140. operation Cooling LEV on the indoor unit LEV1 2 3 SVM1 2 SVA Heating LEV on the indoor unit LEV3 SVB SV4a 4d SV5a 5b Refer to the page on trouble shooting LEV 9 Port address setting error Confirm the port address of the in door unit 10 Closed ball valve 11 Outdoor fan including fan parts failure motor failure or fan controller malfunction gt Heating only or heating main Rise in discharge temp by low pressure drawing for 3 11 12 Gas leak between low and high pressures 4 way valve failure compressor failure solenoid valve SV1 SV2 failure 13 Thermistor failure TH11 TH12 14 Input circuit failure on the controller board thermistor MOT Confirm that the ball valve is fully open Check the fan on the outdoor unit Refer to the section on troubleshoot ing the outdoor unit fan Perform a cooling or heating opera tion and check the operation Check the thermistor resistor Check the inlet air temperature on the LED monitor and check for con tact failure of the connector IX Troubleshooting Error Code SNOrGE MINON ANG Aror Cause Check method and remedy detection method Abnormal low When starting the com Inner pressure drop due to Refer to the section on troubleshoot pressure pressor from Stop Mode a leakage ing the low pressure sensor for the first time if low 2 Low pressure sensor fail pressure reads ure 0 098MPa 14psi imme 3
141. or handling units for use with R410A Do not use the existing refrigerant piping Use a vacuum pump with a reverse flow check valve A large amount of chlorine that may be contained in the re sidual refrigerant and refrigerating machine oil in the exist ing piping may cause the refrigerating machine oil in the new unit to deteriorate R410A is a high pressure refrigerant and can cause the existing pipes to burst Use refrigerant pipes made of phosphorus deoxidized copper Keep the inner and outer surfaces of the pipes clean and free of such contaminants as sulfur oxides dust dirt shaving particles oil and water These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate Store the pipes to be installed indoors and keep both ends of the pipes sealed until immediately before braz ing Keep elbows and other joints wrapped in plastic Infiltration of dust dirt or water into the refrigerant system may cause the refrigerating machine oil to deteriorate or cause the unit to malfunction Use a small amount of ester oil ether oil or alkylben zene to coat flares and flanges Infiltration of a large amount of mineral oil may cause the re frigerating machine oil to deteriorate Charge liquid refrigerant as opposed to gaseous re frigerant into the system If gaseous refrigerant is charged into the system the com position of the refrigerant in the cylinder will change and may
142. or more See the next item 4 ii When SC 16 is less than 10K 18 F After the compressor stops collect the refrigerant inside the system repair the leak perform evacuation and recharge new refrigerant Leak spot In the case of outdoor unit handle in the same way as heating season SC16 self diagnosis switch 12345 67 8 910 ON 4 Stop all the indoor units and stop the compressor i To stop all the indoor units and the compressors turn SW3 2 from ON to OFF when SW3 1 on the outdoor MAIN board is ON ii Check that all the indoor units are being stopped 5 Close the ball valves BV1 and BV2 6 To prevent the liquid seal extract small amount of refrigerant from the check joint of the liquid ball valve BV2 as the liquid seal may cause a malfunction of the unit 7 Collect the refrigerant that remains inside the outdoor unit Do not discharge refrigerant into air into the atmosphere when it is collected 8 Repair the leak 9 After repairing the leak replace the dryer with the new one and perform evacuation inside the outdoor unit 350 IX Troubleshooting 10 To adjust refrigerant amount open the ball valves BV1 and BV2 inside the outdoor unit Note When the power to the outdoor indoor unit must be turned off to repair the leak after closing the ball valves specified in the item 5 turn the power off in approximately one hour after the outdoor indoor units stop i When 30 minutes have passed a
143. or resistance TH1 temperature intake or an open low tempera 5105 ae ture intake of the ther Pinched lead wire Check for pinched lead wire mistor is detected the 3 Torn wire coating Check for wire coating first detection the outdoor unit stops turns to anti restart mode for 3 minutes and restarts when the 5106 Outdoor air temperature TH6 5107 SC coil outlet TH7 4 A pin on the male connec Check connector detected temperature tor is missing or contact of the thermistor failure 2 When a short or an 5 Disconnected wire Check for wire open is detected again the second detection 6 Thermistor input circuit Check the intake temperature of the after the first restart of failure on the main board sensor with the LED monitor the outdoor unit the When the temperature is far different outdoor unit stops from the actual temperature replace turns to anti restart the control board mode for 3 minutes and restarts in 3 min utes when the detect ed temperature is within the normal range 3 When a short or an open is detected again the third detection af Short detection Open detection TH1 240 C 464 F and above 0 57 kQ 0 C 32 F and below 643 kQ TH5 110 C 230 F and above 0 4kQ 40 C 40 F and below 130 kQ TH6 110 C 230 F and above 0 4KQ 40 C 40 F and below 130 kQ TH7 70 C 158 F and above 1 14kQ 40 C 40 F and be
144. ote controller failure An error occurs when the data cannot be read normally from the nonvolatile memory built in on the remote controller Remote controller board failure Remote controller failure An error occurs when the clock function built in on the remote controller does not work nor mally Address overlaps Two or more remote controllers for The error is detected when the the outdoor units the indoor units same address is transmitted LOSSNAY and the M NET remote from different units controllers have the same address es Note The address attribute appeared on the display lt Example gt on the remote controller The error code 6600 01 appeared indicates the controller on the display on the remote control where an error oc ler indicates that an error occurred in curred No 1 unit Two or more units whose addresses are 01 exist in the same system Unset polarity 1 No voltage is applied to the M NET transmission line that The error detected when trans G 50A is connected to mission processor cannot dis 2 M NET transmission line to tinguish the polarities of the which G 50A is connected is M NET transmission line short circuited 255 IX Troubleshooting Replace the remote controller Replace the remote controller Search for the unit which has the same ad dress with that of the source of the trouble When the same address is found turn off the power of the outdoor unit LOSSN
145. oting 3 System connected to the system controllers MELANS Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Enor Error dis Detection source ad Check method and remedy dicas play method System M NET re No ac 1 Error display on some displays on Check 1 3 on the left controller mote con knowl M NET remote controllers SC troller RC edgement 1 Faulty wiring of the transmission MA remote ACK atIC line for M NET remote controller controller transmis 2 Disconnection or contact failure MA sion to SC of the transmission connector for M NET remote controller 3 M NET remote controller failure 2 Error occurrence on all IC in the 1 Check the LED display for troubleshoot system with one outdoor unit ing on the outdoor unit 1 An error is found by the outdoor gt lf an error is found check the check unit code definition and correct the error Total capacity error 7100 gt lf no error is found check 2 Capacity code error 7101 2 Check 2 4 on the left Error in the number of connect ed units 7102 Address s
146. p Mode for the first time if low pressure reads 0 098MPa 14psi imme diately before start up the operation immediate ly stops Inner pressure drop due to Refer to the section on troubleshoot a leakage ing the low pressure sensor 2 Low pressure sensor fail ure 3 Short circuited pressure sensor cable due to torn outer rubber 4 A pin on the male connec tor is missing 5 Disconnected wire 6 Failure of the low pressure input circuit on the control ler board 244 IX Troubleshooting Error Code SRON GE MINON ANG Aitor Cause Check method and remedy detection method LEV failure on the indoor 1302 Abnormal high 1 Ifthe pressure of 3 87MPa Perform a heating operation and pressure 1 outdoor unit Abnormal high pressure 2 outdoor unit 561 psi or higher is detect ed by the pressure sensor during operation the first detection the outdoor stops once turns to anti restart mode for 3 minutes and restarts after 3 min utes automatically If the pressure of 3 87MPa 561 psi or higher is detect ed by the pressure sensor again the second detec tion within 30 minutes af ter the first stop of the outdoor unit the outdoor unit stops once turns to anti restart mode for 3 min utes and restarts after 3 minutes automatically If the pressure of 3 87MPa 561 psi or higher is detect ed by the pressure sensor the third detection within 30 minutes of the
147. pe If the unit is left on a damaged platform it may fall and lightning rod or grounding wire from a telephone pole Im Cause injury proper grounding may result in electric shock smoke fire and or malfunction due to noise interference Properly install the drain pipes according to the in structions in the installation manual Keep them insu Do not put tension on the power supply wires lated to avoid dew condensation If tension is put on the wires they may break and result in Improper plumbing work may result in water leakage and excessive heat smoke and or fire damage to the furnishings Install an earth leakage breaker to avoid the risk of elec Exercise caution when transporting products ic shock FE MIRNOG Products weighing more than 20 kg should not be carried Failure to install an earth leakage breaker may result in alone electric shock smoke and or fire Do not carry the product by the PP bands that are used on some products Use the kind of power supply wires that are specified in Do not touch the heat exchanger fins They are sharp and the installation manual dangerous When lifting the unit with a crane secure all four corners to current leak electric shock and or fire Properly dispose of the packing materials Use breakers and fuses current breaker remote switch lt switch Type B fuse gt moulded case circuit breaker Nails and wood pieces in the package may pose a risk of with the prop
148. ply eee Sl s Cooling fan mann Ny aa Drive circuit 5 O O O O ed Cooling fan 12V Power supply poy 7 V Power suppl Power supply for centralized Terminal block for power source TB15 ___ Indoor unit 1 gt l l l l l l l l l j l l l l l C l l TB5 for MA remote E S controller Pe Terminal block for transmission line connection DC 17 30V L_ AB Deire M NET remote controller LL A Bor1 2 DC 8 5 12V MAremote controller nn MA remote controllers and M NET remote controllers cannot be used together 347 IX Troubleshooting P168 P234 models nos POWer source system AC 208 230 V Control system DC 5 30 V Fuse 63 A 52C2 5102 O o ol lo No 2 Compressor AC 208 230 V TB1 Terminal block for Q 52C1 Noise filter Smoothing capacitor No 1 Compressor G A board Relay board Heat l exchanger DIP IPM i IPM drive circuit n 15 V Power supply DC DC converter 52C1 Solenoid valve 4 way valve Relay LEV Drive circuit I Transformer 5 V Power supply 15 V Power supply E Coens oe eee eee gt Rectifier l J Cooling fan Cooling fan Fan INV board Drive circuit J E DRO a Outdoor unit 12 V Power supply 5 V Power supply TB7 Terminal block fo
149. r 5 Compressor INV board Check that a voltage of 208 230V is failure and cooling fan fail applied to the compressor INV board detected ure connector CNFAN while the inverter is in operation 6 Cooling failure Check the cooling fan operation un der the above operating conditions 7 IPM failure Refer to 9 4 8 2 2 Check for compres sor ground fault or coil error Refer to 9 4 8 2 5 Check the inverter circuit trouble 4240 Overload pro When the greater output 1 Short cycle of the air pas Check that the waste heat from the 4245 tection current lac than the sage outdoor unit fan is not short cycled aay ath is detected for 10 min peoe Taa utes in a row 3 Power supply Check whether the power supply oo T max voltage is 187V or more 4 Faulty wiring Check cooling fan wiring 5 THHS failure Check THHS sensor resistance Inthe case of 4240 THHS In the case of 4245 THHS5 P144 model model 53 Arms Arms 6 Compressor INV board Check that a voltage of 208 230V is failure and cooling fan fail applied to the compressor INV board ure connector CNFAN while the inverter mode rms ane IS IN operation i P234 model 7 Cooling failure Check the cooling fan operation un der the above operating conditions 8 Current sensor ACCT Refer to 9 4 8 4 Current sensor failure ACCT 9 Compressor Inverter cir Refer to 9 4 8 2 4 Check wheth cuit failure er the in
150. r transmission line for centralized control DC 24 30 V Power supply for centralized control TB7 side I I I line TB3 side TB3 Indoor outdoor Lec Fares transmission block SS DC 24 30V 4 Main board e INV board M NET M E ee E E ee E Pe Ee Pe Pe a m Ei transmission line Non polar 2 wire I a a a Non p Ji TB2 M l Terminal block for power source TB15 p _ r uni E Terminal block for Indoo unit l 7 a l LL TB5 power source o next uni aa Indoor unit ere l ee Terminal block ry for transmission oe o ee oe ee l l DC 17 30V hill ee DF eee SF TT eee ea E TD eee ST Tee EPFL FeO I l ae g od _ E E l A B Ea I ON FER O g DC 17 30 V M NET remote 25 controller a l I a Po l l l l l l i PO A Bor 1 2 DC 8 5 12 V MA remote controller o onn MA remote controllers and M NET remote controllers cannot be used together 348 IX Troubleshooting 2 Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor outdoor transmission terminal block TB3 of outdoor unit YES gt Check whether the transmission line is disconnected check NO for contact failure and repair the problem Check the voltage at TB3 afte
151. r removing transmission line from TB3 YES Check if the indoor outdoor transmission line is not ii NO short circuited and repair the problem Check whether the male connector is connected to the female power supply connector CN40 y NO Connected YES Check voltage of terminal block for centralized control TB7 lt 6 24 30 VS YES Check the wiring between connectors CNS1 and TB3 gt Check if the connector CNS1 is not disconnected Y no Check voltage of TB7 by removing transmission line from TB7 lt lt pe 24 30 ue Check if the transmission line for centralized control is not short Disconnected Connect it NO circuited and repair the problem Check the voltage between 1 and 2 and 1 and 3 of main board CNVCC1 YES Check and repair wiring between main board connector CNVCC1 and INV board connector CNVCC1 Check if the connector CNL1 and CNL2 on the INV board are not disconnected YES Connect it NO Check the voltage between 1 and 3 of INV board CNDC2 YES Replace the INV board NO Check the voltage of the power supply terminal block TB1 y No AC 208 230 V YES Check if the connector on the outdoor unit board is not disconnected NV board CNDC2 G A board CNDC1 Check and repair power source wiring and main power source YES Disconnected Connect it Check the wiring inside the outdoor unit G A board CNDC1 INV
152. r unit 13 Indoor fan including fan parts failure or motor failure For 9 13 rise in high pres sure caused by lowered con densing capacity in heating only or heating main operation 14 Short cycle on the out door unit 15 Dirty heat exchanger of the outdoor unit Check the fan on the outdoor unit Refer to the section on troubleshoot ing the outdoor unit fan 16 Outdoor fan including fan parts failure motor failure or fan controller malfunction gt Heating only or heating main Rise in discharge temp by low pressure drawing for 13 15 Refer to the section on troubleshoot ing the solenoid valve Check the thermistor resistor Refer to the page on the trouble shooting of the high pressure sen Sor 17 Rise in high pressure cannot be controlled due to solenoid valve SV1 malfunction 18 Thermistor failure TH5 TH7 19 Pressure sensor failure 20 Failure of the thermistor input Check the temperature on the LED monitor circuit and pressure sensorin and check for contact failure of the connec put circuit on the controller tor board 21 Faulty mounting of ther mistor TH5 TH7 22 Disconnected male connector on the pressure switch 63H or disconnected wire 2 3 IX Troubleshooting Error Code SRON GE MNOM ANG Aitor Cause Check method and remedy detection method 1302 Abnormal high pressure 2 outdoor unit 1500 Refrigerant overcharge
153. refrigerant shortage on the running unit 3 RPM error of the outdoor unit FAN Refer to the page on troubleshooting of the Motor failure or board failure or outdoor unit fan airflow rate decrease due to clog Refer to 5106 ging of the heat exchanger Refer to 1302 The fan is not properly controlled as the outdoor temperature cannot be precisely detected by the tem perature sensor The fan is not properly controlled as the pressure cannot be precise ly detected by the pressure sen sor 310 IX Troubleshooting ON O a a E o E E a Although cooling operation starts with the normal remote controller display the capacity is not enough 4 Long piping length The cooling capacity varies great ly depending on the pressure loss When the pressure loss is large the cooling capacity drops 5 Piping size is not proper thin 6 Insufficient refrigerant amount Protection works and compressor frequency does not rise due to high discharge temperature 7 Clogging by foreign object 8 The indoor unit inlet temperature is excessively Less than 15 C 59 F WB 9 Compressor failure The amount of circulating refriger ant decreases due to refrigerant leak in the compressor 10 LEV1 malfunction Sufficient liquid refrigerant is not be supplied to the indoor unit as sufficient sub cool cannot be se cured due to LEV1 malfunction 11 TH5 TH7 and HPS sensor fail ure or faulty wiring LEV1 is
154. res sor frequency does not rise due to high pressure 2 Indoor unit LEV malfunction Insufficient refrigerant flows due to LEV malfunction not enough opening 3 When the higher temperature than the actual temperature is de tected due to malfunction of the piping sensor TH22 on the in door unit the smaller sub cool is detected and LEV opening will be smaller 4 RPM error of the outdoor unit FAN Motor failure or board failure or airflow rate decrease pressure drop due to clogging of the heat exchanger leading to high dis charge temperature The fan is not properly controlled as the temperature cannot be precisely detected with the pip ing sensor 312 1 Check pressure difference between the detected pressure by the pressure sen sor and the actual pressure with self di agnosis LED gt f the accurate pressure is not de tected check the pressure sensor Re fer to the page on Troubleshooting of Pressure Sensor Note Higher inlet pressure by the high pressure sensor than the actual pressure causes insufficient ca pacity SW1 setting High pressure sensor 12 34 56 7 8 910 ON Low pressure 12 2 Check the difference between the con densing temperature Tc and the tar get condensing temperature Tcm with self diagnosis LED Note Higher Te than Tem causes in sufficient capacity SW1 setting Condensing temperature Tc 1238456 7 8 9 10 ON Target conden
155. result in performance loss If a vacuum pump that is not equipped with a reverse flow check valve is used the vacuum pump oil may flow into the refrigerant cycle and cause the refrigerating machine oil to deteriorate Prepare tools for exclusive use with R410A Do not use the following tools if they have been used with the con ventional refrigerant gauge manifold charging hose gas leak detector reverse flow check valve refrigerant charge base vacuum gauge and refrigerant recovery equipment lf the refrigerant or the refrigerating machine oil left on these tools are mixed in with R410A it may cause the re frigerating machine oil to deteriorate Infiltration of water may cause the refrigerating machine oil to deteriorate Gas leak detectors for conventional refrigerants will not de tect an R410A leak because R410A is free of chlorine Do not use a charging cylinder If a charging cylinder is used the composition of the refrig erant will change and the unit may experience power loss Exercise special care when handling the tools for use with R410A Infiltration of dust dirt or water into the refrigerant system may cause the refrigerating machine oil to deteriorate Only use refrigerant R410A The use of other types of refrigerant that contain chlorine i e R22 may cause the refrigerating machine oil to deteri orate Before installing the unit a a measures to reduce noise interference If gaseous
156. roller has been isting address which some indoor units should not changed after the group is set have be existed using M NET remote controller Use either of the following two methods for the indoor unit is keeping the deletion memory of the previous ad 1 Address deletion by M NET remote dress controller The same symptom will appear Delete unnecessary address informa for the registration with SC tion using the manual setting function of 2 Although the address of LOSS M NET remote controller Refer to this NAY has been changed after the service handbook 4 2 Group set interlock registration of LOSS tings and interlock settings via the ME NAY is made using M NET re remote controller 1 3 Address dele mote controller the indoor unit is tion keeping the memory of the pre Deletion of connection information of vious address the outdoor unit by the deleting switch Note that this switch deletes all the group information set via M NET re mote controller and all the interlock information of LOSSNAY and the in door unit Turn off the power source of the out door unit and wait for 5 minutes Turn on the dip switch SW2 2 on the outdoor unit main board Turn on the power source of the out door unit and wait for 5 minutes Turn off the power source of the out door unit and wait for 5 minutes Turn off the dip switch SW2 2 on the outdoor unit main board Turn on the power source of the out door unit
157. ror In the case of 4255 1 Fan motor abnormality 2 FAN INV board failure 1 Inverter output related In the case of 4250 1 Grounding fault of com pressor 2 Inverter output related In the case of 4255 1 Grounding fault of fan mo tor 2 FAN INV board failure In the case of 4250 1 Short circuited compres sor 2 Output wiring 3 Power supply In the case of 4255 1 Short circuited fan motor 2 Output wiring 3 Power supply Same as 4230 error Same as 4230 error Refer to 9 4 8 2 6 Refer to 9 4 8 2 7 9 4 8 2 Inverter output related troubles Refer to 1 5 Refer to 9 4 8 2 Refer to 9 4 8 2 6 Refer to 9 4 8 2 7 Refer to 9 4 8 2 2 Refer to 9 4 8 2 6 Same as 4230 error Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 280 IX Troubleshooting Temperature sensor failure indoor unit Error Code Or peunitien arickerror Cause Check method and remedy detection method 5101 If a short or an open is 1 Thermistor failure Check the thermistor resistor 5102 Liquid pipe detected during thermo 2 Connector contact failure 0 C 32 F 15 kohm 5102 Liquid pipe stat ON the outdoor unit 3 Disconnected wire or par 10 C 50 F 9 7 kohm 5103 Gas pipe turns to anti restart mode tial disconnected ther 20 C 68 F 6 4
158. ror 7101 Error in the number of connected units 7102 Address setting error 7105 If no error is found gt Indoor unit board failure 1 Same causes as 1 5 for system with one outdoor unit Interlocked operation between LOSS NAY and the indoor units in the system in which the indoor units connected to different outdoor units are grouped Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized control line connection TB7 When multiple outdoor units are con nected and the power source of one of the outdoor units has been shut off The male power supply connector of the outdoor unit is not connected to the female power supply switch connector CN40 The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch con nector CN40 for centralized control If an error occurs after the unit runs normally once the following causes may be considered Total capacity error 7100 Capacity code error 7101 Error in the number of connected units 7102 Address setting error 7105 Turn off the power source of LOSSNAY for 5 or more minutes and turn it on again If the error is accidental it will run normally If not check the cause 2 Check the causes of 1 5 If the cause is found correct it If no cause is found check 3 Same cause as that for indoor unit de scribed in 3 209 IX Trou
159. rost bites and burns do i not touch these parts with bare hands CONTENTS I Read Before Servicing ii Read STOR Servicing eines act al ech tcl attrac ec O a 3 2 Necessary Tools and Materials cccccccccssececcseeeeeceeseeeceeeeeeseaeeeecseeeessegsessgeeesseeeesseneeeees 4 I PIPING Material S oessa A E E E E T oad ana 5 AF Storage 510 ill gal OL 0 eea e a e r a i E RS 7 Si PRIDE PROCESSING arii a a et neck Medea aa catchy 7 6 Brang wpcoiee ncaa nts deates dei ch can hasten Nas ein bet E N el 8 I Ar WGI SS TOS loran EE E E a edunesiuaarnetae ovate 9 8 Vacuum Drying EVACUATION eeren EEE EEEE EE EE E EEE EEE 10 Sy Remgerant Charging eirese n E E A A A E T OA takes 11 10 Remedies to be taken in case of a Refrigerant Leak cecccccceccccceeceeceeceeceeeeesseeeeeesaees 11 11 Characteristics of the Conventional and the New Refrigerants cccccscccecsseeeeeeeeeeeeaees 12 12 Notes on Refrigerating Machine Oil ccccccccccccecseeeeeeeeseeeeeeeseeeeeeeeesseeeseeessaaeeeeeesseaeeeeeeeas 13 II Restrictions 1 Types and Maximum allowable Length of Cables ccccecccccsssseeeeeeeeeeeeeessaeeeeeeeeaeeeeeeeeas 17 2 Switch Settings and Address Settings cccccccccccscsssseeeeeeeeeeeeeeeeeeeeeseaeeeeeeeeeseseeaeeeeeeeeessaas 18 3i Sample Systent COMNMECH OM aseene e a aia asa E E ae 23 4 An Example of a System to which an MA Remote Controller is connected 0
160. row Contact failure of the remote controller lines of MA remote controller or the indoor unit 2 All the remote controllers are set to SUB 3 Failure to meet wiring regula tions Wire length Wire size Number of remote controllers Number of indoor units 4 The remote controller is re moved after the installation with out turning the power source off 5 Noise interference on the re mote controller transmission lines 6 Faulty circuit that is on the in door board and performs trans mission reception of the signal from the remote controller 7 Problems with the circuit on the remote controller that sends or receives the signals from the re mote controller 1 Contact failure of the remote controller lines of MA remote controller or the indoor unit 2 2 or more remote controllers are set to MAIN 3 Overlapped indoor unit address 4 Noise interference on the re mote controller lines 5 Failure to meet wiring regula tions Wire length Wire size Number of remote controllers Number of indoor units 6 Problems with the circuit on the remote controller that sends or receives the signals from the re mote controller 297 Check for disconnected or loose transmission lines for the indoor units or MA remote controllers 2 Confirm that the power is supplied to the main power source and the remote controller line 3 Confirm that MA remote controller s Capacity limit is not exc
161. rror Check the voltage of the power sup sync signal ab determined when the ply terminal block TB1 noray Powel IS SWCNEG On A fuse is blown Check the fuses on the main board F01 and F02 2 3 Faulty wiring Measure voltages of pin 5 of the male connector CN20 on the main board and between pins 1 and 3 of the male connector CN21 on the main board If the voltage AC208 230V is not the same as the power supply volt age the wiring is faulty No 2 compressor the 2 Power supply error Check the voltage of the power sup Power supply voltage ply terminal block TB1 outdoor unit stops d AREE R ps once turns to anti re lee l eck for open phase start mode for 3 min an p es of power utes and restarts after SUppIy voltage 3 minutes Set value 3 Faulty wiring Check 52C2 connector and the wir of the over current re lay 43A Second detection If 51C2 is started again within a minute after restarting in com pliance with 1 above the unit makes an er ror stop and the error code 4108 will ap pear 3 There will be a minute grace period of an er ror stop when No 2 compressor restarts after the outdoor unit stops and LED indi cates which means ing Check the wiring and apply a meg ger to the compressor Start operation under no load condi tions Remove the power wire on the com pressor side insulate the power line and start operation gt The compressor is faulty if
162. rrors occur eg The third stop is considered as an error when the thermistor error occurs 313 IX Troubleshooting 3 Investigation of Transmission Wave Shape Noise 1 M NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit M NET remote controller through M NET transmission Noise interference on the transmission line will interrupt the normal transmission leading to errone ous operation 1 Symptoms caused by noise interference on the transmission line Cause Erroneous Erroneous operation Errorcode code Error code definition code definition a ae is transformed and will be misjudged as the Address oo signal of another address Transmission wave pattern is transformed due to Transmission pro the noise creating a new signal cessor hardware er ror Transmission wave pattern is transformed due to Noise interference on ane the noise and will not be received normally leading the transmission line to no acknowledgement ACK Transmission cannot be performed due to the fine 6603 Transmission circuit noise bus busy Transmission is successful however the acknowl No ACK edgement ACK or the response cannot be re No response ceived normally due to the noise 2 Wave shape check No fine noise aN SS 7 L 7 With transmission No fine noise allowed Without transmission Check the wave pattern of the transmission line with an
163. run normally If not check the cause 2 Check the causes of 1 5 If the cause is found correct it If no cause is found check 3 Same cause as that for indoor unit de scribed in 3 If the operation does not return to nor mal check the causes 1 through 5 If an error occurs after the unit runs normal ly once the following causes may be consid ered Total capacity error 7100 Capacity code error 7101 Error in the number of connected units 7102 Address setting error 7105 291 IX Troubleshooting 3 System connected to the system controllers MELANS Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the Error source ad dress Outdoor unit OC BC control ler BC Indoor unit IC Error dis play M NET re mote control ler RC System con troller SC MA remote controller MA M NET re mote control ler RC system con troller SC MA remote controller MA M NET re mote con troller RC system controller SC Detection method No ac knowl edgement ACK at BC trans mission to OC No ac knowl edgement ACK atIC transmis sion to BC No acknowl edgement ACK at RC transmission to IC No ac knowl edgement ACK at SC trans mission to IC transmission eg When the data is transmitted six times in a row wi
164. rvice space can be secured at the rear Only NU GA type for SVM 2 CMB 1016NU GA 356 sa MITSUBISHI ELECTRIC HVAC Advanced Products Division 3400 Lawrenceville Suwanee Road e Suwanee Georgia 30024 Toll Free 800 433 4822 e Toll Free Fax 800 889 9904 www mrslim com Specifications are subject to change without notice
165. s attribute appeared on the display on the remote controller indicates the controller where an error oc curred Communication error with the 1 Data is not properly transmitted Turn off the power source of the outdoor transmission processor due to accidental erroneous op and the indoor units When the power Communication error between eration of the controller of the er source is turned off separately the micro the main microcomputer on the ror source computer will not be reset and the error indoor unit board and the mi 2 Error source controller failure will not be corrected s crocomputer for transmission gt If the same error occurs the error source controller is a failure Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred 288 IX Troubleshooting 1 System with one outdoor unit 6607 Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Error source ad dress Outdoor unit OC BC control ler BC Indoor unit IC LOSSNAY LC M NET re mote con troller RC Error dis play M NET re mote con troller RC MA remote controller MA M NET re mot
166. s detected the first detection the outdoor unit stops turns to anti restart mode for 3 minutes and restarts when the detected temperature of the thermistor 2 When a short or an open is detected again the second detection after the first restart of the outdoor unit the outdoor unit stops turns to anti restart mode for 3 minutes and restarts in 3 min utes when the detect ed temperature is within the normal range 3 When a short or an open is detected again the third detection af ter the previous restart of the outdoor unit the outdoor unit makes an error stop 4 When a short or an open of the thermistor is detected just before the restart of the out door unit the outdoor unit makes an error stop and the error code 5101 5103 5104 5105 5106 or 5107 will appear 5 During 3 minute anti restart mode prelimi nary errors will be dis played on the LED display 6 A short or an open de scribed above is not detected for 10 min utes after the com pressor start during defrost mode or for 3 minutes after defrost mode Thermistor failure 2 Pinched lead wire 3 Torn wire coating 4 A pin on the male connec tor is missing or contact failure 5 Disconnected wire 6 Thermistor input circuit failure on the main board Short is detection Check for pinched lead wire Check wire coating Check connector Check for wire Check t
167. se cannot be started be is normal cause of the open Check the wiring between the pow phase of one of the er supply terminal block TB1 and power lines L1 L2 or the main boards CN20 and L3 CN21 Pin If the above faults are not found the main board is faulty The operation cannot 1 Power supply error Check the input resistance of the be started because of Open phase of power power supply terminal block TB1 the reserve phase of supply voltage one of the power lines Power supply voltage L1 L2 or L3 drop 2 Main board failure 2 Faulty wiring Measure voltages of pin 5 of the Between the power supply male connector CN20 on the terminal block TB1 and main board and between pins 1 the main boards CN20 and 3 of the male connector and 21 CN21 on the main board lf the voltage is not the same as the power supply voltage the wiring is faulty 3 A fuse is blown Check whether the fuses of the main board both F01 and F02 are not blown If the above faults are not found the main board is faulty 4 Main board failure 2 6 IX Troubleshooting Error Eworcode SOF CEN AIO Hane Aror Cause Check method and remedy detection method 4108 ee 1 First detection Overload operation that Check the unit working condition protection lf 51C2 is started during exceeds unit use limit the operation of No 2 com Power supply error Check the voltage of the power sup Power supply voltage ply
168. sensor has a problem 2 If other than 1 the main board has a problem 2 Pressure sensor configuration The high pressure sensor consists of the circuit shown in the figure below If DC 5V is applied between the red and the black wires voltage corresponding to the pressure between the white and the black wires will be output and the value of this voltage will be converted by the microcomputer The output voltage is 0 071V per 0 098MPa 14psi The pressure sensor on the body side is designed to connect to the connector The connector pin number on the body side is different from that on the main board side Body side Main board side 4 5 653 4 0 580 Pressure 0 4 15 MPa 601psi 3 5 508 Vout 0 5 0 35 V 0 071 V 70 098 MPa 14 psi 2 sons wo o 2 5 363 Connector 3 2 0 290 amp 1 5 218 GND black 1 0 145 Vout White 0 5 73 0 Vcc DC 5 V Red 0 05 1 15 2 25 3 35 Output voltage V 317 IX Troubleshooting Tor Error source Emor geunitionane error Cause Check method and remedy Code detection method MA remote controller intended for use with indoor units such as an MA remote controller is connected to the OA process ing unit whose attribute is FU 7 7107 BC controller Attribut
169. sing temperature Tcm 1234567 8 910 ON Protection works and compressor fre quency does not rise even at lower Tc than Tem due to high discharge temperature and high pressure At high discharge temperature Refer to 1102 At high pressure Refer to 1302 Refer to the page of LEV troubleshooting 9 4 6 Check the thermistor TH22 Refer to the page on outdoor unit fan 4 4 IX Troubleshooting CE e E A Although heating operation 5 Insulation failure of the refrigerant starts with the normal remote piping conoley Spay tie capacly 6 Long piping length Confirm that the characteristic of capacity is not enough l ae ie Excessively long piping on the drop due to piping length high pressure side causes pres gt Change the pipe sure loss leading to increase in the high pressure 7 Piping size is not proper thin 8 Clogging by foreign object Check the temperature difference between in front of and behind the place where the foreign object is clogging the pipe up stream side and downstream side Difficult to confirm if the object is clogged inside the extended piping Run the unit in cooling mode and find the foreign object using the same method as that for cooling operation gt Remove the foreign object 9 The indoor unit inlet temperature Check the inlet air temperature and for short is excessively high exceeding cycling Change the environment where the 28 C 82 F indoor
170. sor circuit failure 119 IPM open Disconnected ACCT connector 120 ACCT faulty wiring detection 6201 Remote controller board failure nonvolatile mem ory failure Communication error with the transmission pro cessor No ACK MA communication transmission error No receipt MA communication receipt error Synchronization MA communication transmission error Hardware error Prelimi nary Error Code Notes error code A Fa G O O O am 6202 6600 6601 6602 2 6603 6606 ES 6607 a 6608 ES 6831 6832 6833 MA communication transmission error 6834 Start bit detection error ie Z 411 Se Shere les fet ee jj tf eel eles fot td eee Pt Tt fee efefe fol Tt Tt tT I tossnay 71 7100 Total Total capacity error error DNNE ror 3 fo me ferrero fof TOT ras fresesssengerer OTT TT re fawbtesinoere TO Tr a SO 7a Ursetuntcamesioniiomatonerar TA ff PT Remoteconotersensrtaire OT OT pra rineionsemrooror OT ST TT cre Rescomainsennoerer OT cra ieeeseterer OT TT A T a a Note The last digit in the check error codes in the 4000 s and 5000 s and two digit detail codes indicate if the codes apply to compressor inverter on fan inverter 237 IX Troubleshooting Example Code 4225 Bus voltage drop in the fan inverter system Code 4250 IPM overcurrent breaker
171. ssor INV board or between the male connec tor CNRS3A on the main board and the male connector CNRS2 on the FAN INV board and check for contact of the connectors Check for contact of the connector CNAC3 on the main board or of the connector CNTR on the FAN INV board Check the setting for SW2 1 on the inverter board on the compressor Confirm that the SW2 1 on the fan inverter board is set to ON Measure voltages between pins 1 and 3 of the male connector CNTR on the FAN INV board Replace the compressor INV board or the FAN INV board when the pow er turns on automatically even if the power source Is reset under part 4 Trouble shooting principal parts for error codes related to the inverter Error Code Error definition and error detection method 1102 Abnormal dis 1 lf the discharge tem charge air tem perature of 120 perature C 248 F or more is detected during the above operation the first detection the outdoor unit stops once turns to anti re start mode for 3 min utes and restarts after 3 minutes automati cally 2 If the discharge tem perature of 120 C 248 F or more is detected again the second detection within 30 minutes after the second stop of the outdoor unit described above the mode will be changed to 3 minute restart mode then the outdoor unit will restart in 3 min utes 3 If the discharge tem perature of 120 C 248 F or more is de tected
172. st 0 0 In the case of 52F A u elef Button OFF Pushbutton CO CO CO CO CO 1 Qor less almost 00 DC reactor DCL Measure the resistance between terminals 10hm or lower almost 0 ohm Measure the resistance between terminals and the chassis oo Noise filter Resistance check between each terminal Check point Judgment value and between terminal and case nal FNS 6 FN 2 4 igol ma0a FN 1 2 FN2 3 FN 4 6 FN1 FN2 FNS FN 4 FN6 OO Current sensor ACCT Disconnect the CNCT2 connector and measure the resistance between terminals 280 ohm 30 ohm 1 2 PIN U phase 3 4 PIN W phase ACCT U ACCT W U V W IPM Check the ACCT connection phase and the direction of the connection 344 IX Troubleshooting 5 Intelligent power module IPM Measure resistances between each pair of terminals on the IPM with a tester and use the results for troubleshooting Notes on measurement Check the polarity before measuring On the tester black normally indicates plus Check that the resistance is not open co ohm or not shorted to 0 ohm The values are for reference and the margin of errors is allowed The result that is more than double or half of the result that is measured at the same measurement point is not allowed Tester restriction Use the tester whose internal electrical power source is 1 5V or greater Use the dry battery powere
173. system for the outdoor unit 3 Error display on all displays on M Check 1 4 on the left NET remote controllers 1 Same causes as 1 4 de scribed in 2 2 When the power supply unit for transmission lines is used and the male power supply connec tor is connected to the female power supply switch connector CN40 for the transmission line for centralized control 3 Disconnection or shutdown of the power source of the power supply unit for transmission line 4 System controller MELANS malfunction 263 IX Troubleshooting 4 Errors that are not limited to a particular system Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in a row with 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Enor Error dis Detection source ad Check method and remedy dicas play method Address 1 Although the address of M NET Delete unnecessary information of non ex which remote controller has been isting address which some indoor units should not changed after the group is set have be existed using M NET remote controller Use either of the following two methods for the indoor unit is keeping the de
174. t ACK is received after transmission an error is detected When the data is transmitted 10 times in a row with 3 sec onds interval an error is de tected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller where an error oc curred The transmission line work is see while the power is on the transmitted data will collide and the wave shape will be changed 2 The transmission is sent and re ceived repeatedly due to noise 3 Decrease of transmission line voltage signal by exceeding ac ceptable range of transmission wiring Farthest 200m 656ft or less Remote controller wiring 12m 39ft or less 4 The transmission line voltage signal is decreased due to erro neous sizing of transmission line Wire diameter 1 25mm AWG16 or more 265 When an error occurs at commission ing Turn off the power source of the out door unit indoor unit and LOSSNAY for 5 or more minutes and turn them on again gt When they return to normal opera tion the cause of the error is the transmission line work performed with the power on gt If an error occurs again check the Cause 2 Check 3 and 4 on the left gt If the cause is found correct it gt If no cause is found check 3 Check transmission wave shape noise on trans mission line by follow ing lt Investigation method of transmis s
175. t number using the port number setting switch or the model using the model capacity code setting switch turn off the power of the outdoor unit the BC controller and the indoor unit IX Troubleshooting 2 Low Pressure Sensor 63LS 1 Compare the pressure that is detected by the low pressure sensor and the low pressure gauge pressure to check for failure Set the digital display switch SW1 as shown below to display the pressure that is detected by the low pressure sensor on the self diagnosis LED 12345 67 8 910 ON 1 While the sensor is stopped compare the gauge pressure and the pressure displayed on self diagnosis LED1 1 When the gauge pressure is between 0 and 0 098MPa 14psi internal pressure is caused due to gas leak 2 When the pressure displayed on self diagnosis LED1 is between 0 and 0 098MPa 14psi the connector may be defective or be disconnected Check the connector and go to 4 3 When the pressure displayed on self diagnosis LED1 exceeds 4 15MPa 14psi go to 8 4 If other than 1 2 or 3 compare the pressures while the sensor is running Go to 2 2 Compare the gauge pressure and the pressure displayed on self diagnosis LED1 while the sensor is running Com pare them by MPa psi unit 1 When the difference between both pressures is within 0 03MPa 4psi both the low pressure sensor and the main board are normal 2 When the difference between both pressures exceeds 0 03MPa 4psi the lo
176. t up of the unit has completed normal The start up of the unit has not completed nor mally in the system to which a transmission booster is connected ly When the start up of the unit has completed without turning on the power source of the transmission booster When the power source of the transmission booster is turned on afterwards The remote controller without the temperature sensor the wireless remote controller or the M NET compact remote the temperature data is controller mounted type is not sent although the re used and the remote controller mote controller sensor is sensor for the indoor unit is specified specified SW1 1 is ON Remote controller sen sor failure This error occurs when Short circuit Faulty wiring or contact failure Model setting error short detection Disconnected connector dis connected wire or contact fail ure Model setting error open detection Incompatible units The indoor unit that uses only R22 refrigerant is connected The wrong unit model or the wrong BC controller model is connected When connecting Mr SLIM A control with M NET the con necting adapter for M NET must be connected to the in door unit The check code will ap pear when the indoor unit or the BC controller with different refrigerant sys tems is connected 301 A For the address of the BC controller Sub is 50 added to the smallest indoor unit address whic
177. tep 1 above will start 5 For 30 minutes after the stop of the outdoor unit preliminary errors will be displayed on the LED display 6 The outdoor unit makes an error stop immediately when not only the pressure sen sor but also the pres sure switch detects 4 15 9 0 19 MPa 601 psi LEV failure on the indoor unit 2 BC controller LEV mal function Heating only or heating main Indoor LEV 3 Defrost LEV3 BC controller SVM1 and 2 mal function gt Cooling only or defrost BC controller SVA malfunction gt Cooling only or cooling main BC controller SVB malfunction gt Heating only or heating main Solenoid valve SV malfunction 4a 4d P72 P144 models 4a 4d and 5a 5b P168 P234models heating only heating main gt Heating only or heating main 9 Short cycle on the indoor unit side 10 Clogged filter on the indoor unit Perform a heating operation and check the operation Cooling LEV on the indoor unit LEV1 2 3 SVM1 2 SVA Heating LEV on the indoor unit LEV3 SVM2 SVB SV4a 4d SV5a 5b Refer to the page on trouble shooting for LEV and solenoid valve 7 Port address setting error Confirm the port address of the indoor unit 8 Closed ball valve Confirm that the ball valve is fully open Check the indoor units for problems and correct them if any 11 Reduced air flow due to dirty fan on the indoor unit fan 12 Dirty heat exchanger of the in doo
178. terminal block TB1 drop Check for open phase pressor the outdoor unit stops once turns to anti restart mode for 3 minutes and restarts after 3 min utes Set value of the over current relay 43A Second detection If 51C2 is started again i within a minute after re ng o 4 aun eer 4 Compressor failure Check the wiring and apply a meg eee an ae R Compressor open phase ger to the compressor code 4108 will appear or grounding fault Start operation under no load condi Compressor lock tions There will be a minute grace period of an error Remove the power wire on the com stop when No 2 compres sor restarts after the out door unit stops and LED indicates which means the grace period will appear 4115 Power supply The frequency cannot be Power supply error Check the voltage of the power sup sync signal ab determined when the ply terminal block TB1 normmaniy Powers spiced On A fuse is blown Check the fuses on the main board FO1 and F02 3 Faulty wiring Measure voltages of pin 5 of the male connector CN20 on the main board and between pins 1 and 3 of the male connector CN21 on the main board If the voltage AC208 230V is not the same as the power supply volt age the wiring is faulty Open phase of power supply voltage 3 Faulty wiring Check 52C2 connector and the wir pressor side insulate the power line and start operation gt The compressor is fau
179. th 30 seconds interval the error is detected on the transmission side Note The address attribute appeared on the display on the remote controller indicates the controller which did not provide the response ACK Same cause as that for system with one outdoor unit Same cause as that for system with one outdoor unit Same as grouping of units in a sys tem with multiple outdoor units 1 Error occurrence on some IC 1 Same cause as that for system with one outdoor unit 2 Error occurrence on all IC in the system with one outdoor unit Total capacity error 7100 Capacity code error 7101 Error in the number of connected units 7102 Address setting error 7105 Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized control line connection TB7 Turn off the power source of the out door unit Malfunction of electrical system for the outdoor unit 3 Error occurrence on all IC 1 Same causes as 1 7 described in 2 2 The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch con nector CN40 for the transmission line for centralized control Disconnection or shutdown of the pow er source of the power supply unit for transmission line System controller MELANS malfunc tion 292 Check method and remedy Same remedy as that for system with one outdoor unit Same remedy as that for
180. the third detec tion within 30 minutes after the stop of the outdoor unit described above regardless of the first or the second stop the outdoor unit will make an error stop and the error code 1102 will be displayed 4 If the discharge tem perature of 120 C 248 F or more is de tected more than 30 minutes after the pre vious stop of the out door unit the detection is regarded as the first detection and the operation de scribed in step 1 above will start 5 For 30 minutes after the stop the first stop or the second stop of the outdoor unit pre liminary errors will be displayed on the LED display Cause 1 Gas leak gas shortage Refer to the page on refrigerant amount evaluation 2 Overload operation 3 LEV failure on the indoor unit 4 BC controller LEV mal function Cooling only LEV3 Cooling main LEV1 2 3 Heating only or heating main LEV3 Defrost FLEV3 5 BC controller SVM1 and 2 malfunction gt Cooling only or defrost 6 BC controller SVA mal function gt Cooling only or cooling main 7 BC controller SVB mal function gt Heating only or heating main 8 Solenoid valve SV mal function 4a 4d P72 P144 models 4a 4d and 5a 5b P168 P234models heating only heating main IX Troubleshooting Check method and remedy Check operating conditions and op eration status of indoor outdoor units Perform a heating operation and check the
181. to LC indicates the controller which did not provide the response ACK Same causes as 1 5 for system with one outdoor unit Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized control line connection TB7 When multiple outdoor units are con nected and the power source of one of the outdoor units has been shut off The male power supply connector of the outdoor unit is not connected to the female power supply switch connector CN40 The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch con nector CN40 for centralized control Check method and remedy Same cause as that for system with Same remedy as that for system with one one outdoor unit outdoor unit 1 Turn off the power sources of the out door and indoor units for 5 or more min utes and turn them on again If the error is accidental the will run normally f not check the cause 2 Check the causes of 1 5 If the cause is found correct it If no cause is found check 3 Check the LED displays for trouble shooting on other remote controllers whether an error occurs If an error is found gt If an error is found check the check code definition and correct the error If an error occurs after the unit runs normal ly once the following causes may be consid ered Total capacity error 7100 Capacity code er
182. to LEV to fix the valve position It must be fixed at point Pulse signal is output for approximately 17 seconds When the valve operates smoothly there is no sound from the LEV and no vibration occurs but when the valve is locked noise is generated Whether a sound is generated or not can be determined by holding a screwdriver against it then placing your ear against the handle If liquid refrigerant flows inside the LEV the sound may become smaller Fully open 480 pulses x Pulses 326 IX Troubleshooting 3 Judgment methods and possible failure mode Note The specifications of the outdoor unit outdoor LEV and the indoor unit indoor LEV differ Therefore remedies for each failure may vary Check the remedy specified for the appropriate LEV as indicated in the right column Malfunction Judgment method Target LEV mode Microcomputer Disconnect the control board connector and When the drive circuit has a prob Indoor driver circuit fail connect the check LED as shown in the figure lem replace the control board Outdoor ure below 1kQ LED When the main power is turned on the indoor board or the outdoor MAIN board outputs pulse signals to the indoor LEV for 10 sec onds and to the outdoor LEV for 17 seconds If the self diagnosis LED is not lit or remains lit the driver circuit has a problem LEV mechanism If the LEV is locked the drive motor runs idle and Replace the LEV Indoor
183. ts 1 Error occurrence on some IC 1 Same cause as that for system with one outdoor unit 2 Error occurrence on all IC in the system with one outdoor unit 1 An error is found by the outdoor unit Total capacity error 7100 Capacity code error 7101 Error in the number of connect ed units 7102 Address setting error 7105 2 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 3 Turn off the power source of the outdoor unit 4 Malfunction of electrical system for the outdoor unit 3 Error occurrence on all IC 1 Same causes as 1 4 de scribed in 2 2 The male power supply connec tor on the outdoor unit is con nected to the female power supply switch connector CN40 for the transmission line for cen tralized control 3 Disconnection or shutdown of the power source of the power supply unit for transmission line 4 System controller MELANS malfunction 293 Check method and remedy Same remedy as that for grouping of units in a system with multiple outdoor units Same remedy as that for system with one outdoor unit 1 Check the LED display for troubleshoot ing on the outdoor unit gt lf an error is found check the check code definition and correct the error gt lf no error is found check 2 2 Check 2 4 on the left Check 1 4 on the left IX Troublesho
184. tting error 7105 2 Disconnection or short circuit of the transmission line for the out door unit on the terminal block for centralized control line con nection TB7 3 Turn off the power source of the outdoor unit 4 Malfunction of electrical system for the outdoor unit 3 Error occurrence on all IC 1 Same causes as 1 4 de scribed in 2 2 When the power supply unit for transmission lines is used and the male power supply connec tor is connected to the female power supply switch connector CN40 for the transmission line for centralized control 3 Disconnection or shutdown of the power source of the power supply unit for transmission line 4 System controller MELANS malfunction 262 Check method and remedy Same remedy as that for grouping of units in a system with multiple outdoor units Same remedy as that for system with one outdoor unit 1 Check the LED display for troubleshoot ing on the outdoor unit gt If an error is found check the check code definition and correct the error gt If no error is found check the cause 2 2 Check 2 4 on the left Check 1 4 on the left IX Troubleshooting 3 System connected to the system controllers MELANS Error definition and error detection method No ACK abnormality The error is detected when no acknowledgement ACK signal is received after the transmission eg When the data is transmitted six times in
185. us setting of OC unit address The address of outdoor unit is not being set to 51 100 MA remote controller intended for use with indoor units such as an MA remote controller is connected to the OA process ing unit whose attribute is FU When all power sources are turned off after the start up of the unit has completed normal ly When the start up of the unit has completed without turning on the power source of the transmission booster When the power source of the transmission booster is turned on afterwards 268 Check whether the number of units connected to the outdoor terminal block TB3 for indoor outdoor transmission lines does not exceed the limitation See 1 and 2 on the left Check 2 3 on the left Check whether the transmission line for the terminal block for centralized control TB7 is not connected to the terminal block for the indoor outdoor transmis sion line TB3 Check that the address of OC unit is set to 51 100 Reset the address if it stays out of the range while shutting the power source off To operate the OA processing unit using remote controllers for indoor units such as MA remote controller set the DipSW3 1 on the OA pro cessing unit to ON Operation method SW 3 1 Interlock with the indoor unit OFF 1 Check whether the power source of the transmission is turned on 2 Turn off the power sources of outdoor indoor units and trans mission b
186. ut Oil equalizing pipe Flare Nut Metal fitting 2 Check joint for draining liquid 7 Collecting the Cooling Liquid from the Accumulator Only P168 P234 types 1 Perform evacuation inside the recovery cylinder 2 Connect the check joint for collecting liquid that is derived from the accumulator and the recovery cylinder with a connection pipe or hose that has predetermined withstand pressure Note When the check joint and the connecting pipe hose are connected extremely low temperature oil may flow out Use some protective clothing such as leather gloves 3 Open the valves of the recovery cylinder while the recovery cylinder is being weighed and collect the liquid inside the accumulator into the cylinder Note Allow some capacity when collecting the refrigerant so that the recovery cylinder will not overflow Use several cylinders when collecting large amount of refrigerant 4 After collecting the refrigerant close the valve of the recovery cylinder and remove the connecting pipe hose Note When the check joint and the connecting pipe hose are connected extremely low temperature oil may flow out Use some protective equipment such as leather gloves 5 Charge 3 liter oil from the check joint on the accumulator during evacuation 353 IX Troubleshooting 8 Servicing the BC controller 1 Service panel Special care must be taken when replacing heavy parts Work procedure Explanatory figure 1 Remove 2 lock n
187. ut of range Return oil failure due to capillary blockage gt Replace the capillary 351 IX Troubleshooting 1 Check that the main power is OFF When replacing the compressor due to megger failure and when the megger is 1M ohm or more megger drop is likely due to the liquified refrigerant entering and accumulating in the compressor Turn the power off after powering the crankcase heater at least 12 hours and apply megger again 2 Remove the fin guard the front panel and the front partition plate on the right as you face the front Collect the refrigerant from the service check joints on both high and low pressure sides When collecting refrigerant from the accumulator perform proper work with the reference of refrigerant collecting method from the accumulator Collect the oil from the drain oil pipe that is located on the oil balance pipe Note When collecting the oil prepare an approximately 10 liter container Keep collecting oil until the oil in the drain oil plug clears up Keep track of the amount of collected oil as the same amount of oil will be added Do not splash oil Do not leave the refrigerant circuit open for a long time as the oil rapidly absorbs moisture The collected oil cannot be reused 5 After draining oil from the refrigerant and the drain oil plug remove the metal fitting 1 or the flare nuts 2 places that connect the compressor and the oil balance pipe and bend the oil balance pipe s
188. uts on the control box loosen 2 lock nuts and remove the control box 2 Remove 4 fixing screws on the service panel and remove the service panel 3 Remove 9 machine screws on the ceiling panel and re move the ceiling panel Control Box 2 Control box 1 To check the inside of the control box remove 2 lock nuts on the control box cover 1 Check the terminal connection of the power wire or of the transmission line 2 Check the transformer 3 Check the address switch 2 When the control board is replaced the followings must be noted 1 Check that the board type is NU G NU GA or NU GB 2 Check that the wire or the connector is not incorrectly connected not disconnected or not loose Note It is not required to remove 2 fixing screws on the con trol box when checking the inside 354 IX Troubleshooting 3 Thermistor liquid pipe gas pipe temperature detection Special care must be taken when replacing heavy parts Work procedure Explanatory figure 1 Remove the service panel 1 For TH11 TH12 and TH15 refer to 1 1 2 2 For TH16 refer to 1 1 2 3 2 Remove the lead wire of the piping sensor from the control board 1 TH11 TH12 CN10 2 TH15 TH16 CN11 3 Pull out the temperature sensor from the temperature sen sor housing and replace the temperature sensor with the new one 4 Connect the lead wire of the temperature sensor securely on the control board
189. ve the mode will Rise in discharge temp by be changed to 3 low pressure drawing for minute restart mode 3 6 then the outdoor unit will restart in 3 min 7 Gas leak between low and Perform a cooling or heating opera utes high pressures tion and check the operation 3 If the discharge tem 4 way valve failure Com pressor failur Solenoid perature of 120 C 248 F or more is de valve SV 1 failure tected the third detec 8 Thermistor failure Check the thermistor resistor tion within 30 minutes TH1 7H11 TH12 after the stop of the outdoor unit described 9 Input circuit failure on the Check the inlet air temperature on above regardless of controller board thermistor the LED monitor the first or the second stop the outdoor unit will make an error stop and the error code 1102 will be displayed 4 If the discharge tem perature of 120 C 248 F or more is de tected more than 30 minutes after the pre vious stop of the out door unit the detection is regarded as the first detection and the operation de scribed in step 1 above will start 5 For 30 minutes after the stop the first stop or the second stop of the outdoor unit pre liminary errors will be displayed on the LED display 240 IX Troubleshooting Error Code SOF CeO ANE AMOT Cause Check method and remedy detection method Abnormal low pressure When starting the com pressor from Sto
190. verter is damaged 10 Compressor failure gt Check that the compressor has not overheated during operation Replace the compressor when no fault is found Refer to section 8 Inverter under part 4 Trouble shooting principal parts for error codes related to the inverter 2 9 IX Troubleshooting Error Code Emor Pean anemor Cause Check method and remedy detection method 4250 IPM error When an error signal of 4255 Detail code IPM is detected 111 ACCT overcur When overcurrent break rent breaker 150 Apeak or 60 Arms trip is detected by the current Detail code sensor 102 DCCT over current break er trip Detail code 103 Overcurrent breaking Detail code 106 107 IPM short When IPM short damage grounding fault or grounding on the load Detail code side is detected just be No 104 fore starting the inverter Overcurrent When a short is detected error due to on the compressor or the short circuited fan motor just before the motor inverter operation Detail code No 105 4260 Cooling fan In the case of 4260 4265 abnormality In the case of 4260 When the heat sink temperature THHS1 95 C 203 F or more is detected for 10 or more minutes at in verter startup In the case of 4265 When the heat sink temperature THHS5 85 C 185 F or more is detected for 10 or more minutes at in verter startup In the case of 4250 1 Inverter output related 2 Same as 4230 er
191. w pressure sensor has a problem performance deterioration 3 When the pressure displayed on the self diagnosis LED does not change the low pressure sensor has a problem 3 Remove the low pressure sensor from the main board to check the pressure with the self diagnosis LED display 1 When the pressure displayed on the self diagnosis LED is between 0 and 0 098MPa 14psi the low pressure sen sor has a problem 2 When the pressure displayed on self diagnosis LED is approximately 1 7MPa 247psi the main board has a prob lem When the outdoor temperature is 30 C 86 F or less the main board has a problem When the outdoor temperature exceeds 30 C 86 F go to 5 4 Remove the low pressure sensor from the main board and short circuit between the No 2 and 3 connectors 63HS to check the pressure with the self diagnosis LED 1 When the pressure displayed on the self diagnosis LED exceeds 1 7MPa 247psi the low pressure sensor has a problem 2 If other than 1 the main board has a problem 5 Remove the high pressure sensor 63HS from the main board and insert it into the connector for the low pressure sensor 63LS to check the pressure with the self diagnosis LED 1 When the pressure displayed on the self diagnosis LED exceeds 1 7MPa 247psi the main board has a problem 2 If other than 1 the main board has a problem 2 Low pressure pressure configuration The low pressure sensor consists of the circuit shown in the fi
192. when it is collected 7 Repair the leak 8 After repairing the leak vacuum the extension pipe and the indoor unit 9 To adjust refrigerant amount and to check the composition of refrigerant open the ball valves BV1 and BV2 inside the outdoor unit and turn off SW3 6 2 Leak spot In the case of outdoor unit Cooling season 1 Run all the indoor units in the cooling test run mode i To run the indoor unit in test run mode turn SW3 2 from ON to OFF when SW8 1 on the outdoor MAIN board is ON ii Change the setting of the remote controller for all the indoor units to the cooling mode iii Check that all the indoor units are performing a cooling operation In case of PUHY series 2 Check the values of Tc and TH7 To display the values on the LED screen use the self diagnosis switch SW1 on the outdoor unit main board i When Tc TH7 is 10K 18 F or more See the next item 4 ii When Tc TH7 is less than 10K 18 F After the compressor stops collect the refrigerant inside the system repair the leak perform evacuation and recharge new refrigerant Leak spot In the case of outdoor unit handle in the same way as heating season Tc self diagnosis switch TH7 self diagnosis switch 12 34 5 6 7 8910 12345 6 78 910 ON ON In case of PURY series 3 Check the values of SC16 To display the values on the LED screen use the self diagnosis switch SW1 on the outdoor unit main board i When SC16 is 10K 18 F
193. y ping the main breaker circuited Search for the wire that short circuited and repair it b If item a above is not the cause of the problem the compressor may have a problem 2 Main power breaker trip A compressor ground fault can be con sidered Go to 2 2 343 IX Troubleshooting 4 Simple checking procedure for individual components of main inverter circuit Before checking turn the power off and remove the parts to be checked from the control box Diode stack Refer to Diode stack 9 4 5 6 IPM Intelligent power Refer to Intelligent power module _ 9 4 5 5 module Rush current protection re Measure the resistance between terminals 22 ohm 10 sistor R1 Electromagnetic relay 52C Measure resistance between terminals on each row gt nstallation direction Check point Judgment value Row Row Row Row Short circuit is not allowed Row B to RowE The coil is driven when AC 208 230V is applied Note that the coil is not driven at DC 12V which is different from the conventional relays The resistance of row A cannot be measured with a tester Check that it is not short circuited Test button Electromagnetic con tactor 52C2 52F In the case of 52C2 Check point Judgment value A1 A2 0 1k 20k0 Button 1 Qor less almost 0 0 Pushbutton on V 1Qorless almost 00 hold down 1 Qor less almost 0 0 1 Qor less almo
194. yed on self diagnosis LED1 is between 0 and 0 098MPa 14psi the connector may be defective or be disconnected Check the connector and go to 4 3 When the pressure displayed on self diagnosis LED1 exceeds 4 15MPa 601psi go to 3 4 If other than 1 2 or 3 compare the pressures while the sensor is running Go to 2 2 Compare the gauge pressure and the pressure displayed on self diagnosis LED1 while the sensor is running Com pare them by MPa psi unit 1 When the difference between both pressures is within 0 098MPa 14psi both the high pressure sensor and the main board are normal 2 When the difference between both pressures exceeds 0 098MPa 14psi the high pressure sensor has a problem performance deterioration 3 When the pressure displayed on self diagnosis LED1 does not change the high pressure sensor has a problem 3 Remove the high pressure sensor from the main board to check the pressure on the self diagnosis LED1 1 When the pressure displayed on self diagnosis LED1 is between 0 and 0 098MPa 14psi the high pressure sensor has a problem 2 When the pressure displayed on self diagnosis LED1 is approximately 4 15MPa 601psi the main board has a problem 4 Remove the high pressure sensor from the main board and short circuit between the No 2 and 3 connectors 63HS to check the pressure with self diagnosis LED1 1 When the pressure displayed on the self diagnosis LED exceeds 4 15MPa 601psi the low pressure

(Chapter 9) Technical Service Manual Oct 2005 (HWE05020).

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