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SERVICE MANUAL MSZ-FH09NA MSZ-FH12NA MSZ

1. 1 2 50 68 86 104122140 Temperature Connector to indoor power P C board CN102 El JP RRE JR24 JR88 Jolnts Timer short mode point JPG JPS Refer to 7 1 To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 4 10 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points gt The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Hold the sleeve and the terminal while pull out the terminal pushing the locking slowly lever Connector 10 1 MSZ FHOONA MSZ FH12NA MSZ FH15NA NOTE Turn OFF power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panel Photo 1 1 Remove the horizontal vanes Front panel Removal procedure Unlock the upper and lower vanes as shown in D using a thin instrument Then remove the horizontal vanes in the direction of 2 Horizontal vanes Horizontal vanes Photo 2 Upper and lower vanes Left panel
2. OBH683B i SPECIFICATI ON Indoor model MSZ FH09NA MSZ FH12NA MSZ FH15NA Power supply V phase Hz 208 230 1 60 Disconnect switch A 15 Min circuit ampacity A 1 0 Fan motor 0 67 Airflow COOL Dry Wet 381 304 221 167 137 328 261 190 143 117 398 304 221 167 137 342 261 190 143 117 411 355 304 262 225 354 305 261 225 194 Super high High Med Low Quiet HEAT Dry 437 325 225 167 140 454 325 225 167 140 497 394 317 254 201 0 6 40 36 29 23 20 42 36 29 24 20 1 9 41 36 29 24 21 42 36 29 24 21 5 8 36 7 16 Dimensions D 9 3 16 H 12 11 16 29 Munsell 1 0Y 9 2 0 2 Wireless type 12 24 VDC 4 0 44 39 35 31 27 46 39 34 29 25 Moisture removal Sound level Cooling Super high High Med Low Quiet Heating Cond drain connection O D Weight External finish Remote controller Control voltage by built in transformer NOTE Test conditions are based on AHRI 210 240 3 1 OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V 1 phase 60 Hz Min 187 208 230 Max 253 Indoor unit 2 OPERATION Intake air temperature F Condition Indoor Outdo
3. S3 1 Y Turn ON the power supply Y Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board is normal LED blinks 6 times after 3 minutes Is the bus bar voltage of the inverter P C board normal Refer to TEST POINT DIAGRAM AND VOLTAGE in the outdoor service manual Check of power supply Refer to the outdoor service manual ved Yes Y Does the LED on the inverter P C board repeat ET c and 0 8 second ON quick blinking 3 No Replace he inverterF C board Ue Y Lighted F es or not X2 Be careful of the residual voltage of Y lighted smoothing capacitor Turn OFF the power supply Remove the bridge between the outdoor terminal block S2 and S3 Turn ON the power supply Check the wiring If there are any errors of the indoor outdoor connecting wire such as the damage of the wire intermediate connection and or poor contact to the terminal block replace the indoor outdoor connecting wire Y Is there rated voltage between the indoor terminal block S1 and S2 Confirmation of power voltage No Yes Y Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal No Yes A Turn OFF inverter controlled lighting e
4. blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them 77 will be displayed 8 9 i see CONTROL MODE In the i see control mode the room temperature is controlled based on the sensible temperature 1 Press SENSOR button with a thin instrument during COOL DRY HEAT and AUTO mode to activate i see control mode 3 The default setting is active 2 Press SENSOR button again to activate ABSENCE DETECTION ff 3 Press SENSOR button again to release i see control mode ABSENCE DETECTION ft This function automatically changes the operation to energy saving operation when nobody is in the room 1 To activate this function press SENSOR button until ft appears on the operation display of the remote controller during the i see control mode 2 Press SENSOR button again to release ABSENCE DETECTION NOTE Any person at the following places cannot be detected Along the wall on which the air conditioner is installed Directly under the air conditioner Where any obstacle such as furniture is between the person and the air conditioner A person may not be detected in the following situations Room temperature is high A person wears heavy clothes and his her skin is not exposed A heating element of whic
5. RIL RESISTOR A disconnect should ATLL ROOM TEMP required by local code aK 6 eh THERMISTOR 42 _ RT11 COIL TEMP 110 RT12 THERMISTOR MAIN 2135 rental COIL TEMP SWITCH L RT13 THERMISTOR SUB 5 5 P C BOARD _ MV1 amp IM CN111 TRANSFORMER Gz 1 E MT TB TERMINAL BLOCK 1 CN301 1 CN302 o IRECEIVER DISPLAY P BOARD C BOARD mvi SE Tsee 3 SENSOR INDOOR ELECTRONIC CN151 CONTROL P C BOARD NOTES 1 About the outdoor side electronic wiring refer to the Outdoor unit electronic wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols indicate CO Terminal block 6555 Connector OBH683B 4 6 REFRIGERANT SYSTEM DIAGRAM MSZ FHO9NA MSZ FH12NA Refrigerant pipe 23 8 with heat insulator Flared connection ind Indoor coil ior ad nermistor exchanger RT12 main Indoor coil thermistor RT13 sub Room temperature thermistor RT11 Flared connection Refrigerant pipe 21 4 with heat insulator Refrigerant flow in cooling gt Refrigerant flow in heating MSZ FH15NA Refrigerant pipe 21 2 with heat insulator Flared connection iid Indoor coil Beate thermistor exchanger RT12 main Indoor coil thermistor RT13 sub Room
6. TIMER is cancelled and the display of set time disappears OBH683B PROGRAM TIMER OFF timer and ON timer can be used in combination The set time that is reached first will operate first my and display shows the order of OFF timer and ON timer operation Example 1 The current time is 8 00 PM Example 2 The current time is 11 00 AM The unit turns off at 11 00 PM and on at 6 00 AM The unit turns on at 5 00 PM and off at 9 00 PM Current Current ON ON ON OFF OFF OFF AM PM Ze ON PM OFF PM Benge Du pre 11 E FaN DQ 6 NOTE If the main power is turned OFF or a power failure occurs while ON OFF timer is active the timer setting is celled As these models are equipped with an auto restart function the air conditioner starts operating with timer cancelled when power is restored 8 8 WEEKLY TIMER OPERATION A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week E g Runs at 75 F 24 C from waking up to leaving home and runs at 81 F 27 C from getting home to going to bed on weekdays Runs at 81 F 27 from waking up late to going bed early on weekends Mo Setting1 Setting2 Setting3 Setting4 1 ON OFF ON OFF 75 F 24 C 81 27 6 00 8 30 5 30 10 00
7. Vane motor MV2 VERTICAL Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire RED SKY Normal 219 2730 i see SENSOR MOTOR MT OBH683B Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire RED BLK Normal 262 3280 BLK 9 6 TROUBLESHOOTING FLOW Check of indoor fan motor The indoor fan motor error has occurred and the indoor fan does not operate Turn OFF the power supply Pay enough attention to the high voltage on the fan motor connector CN211 EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER GENCY OPERATION switch is pressed If more than 12 seconds passes turn OFF the power supply and turn it Turn ON the power supply wait 5 seconds or more and then press Is there any foreign matter that interferes the rotation of the line flow fan No ON again then measure the voltage Indoor power P C board 1 Measure the voltage between CN211 and Yes 2 Measure the voltage between CN211 and Indoor electronic control P C board 3 Measure the voltage between CN102 and JPG GND R the forei tt d 2 Sdiust tha Saa e X If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage
8. 23 Replace the inverter P C board or the outdoor electronic control P C board Check Flow chart of the detailed outdoor unit failure mode recall func tion 9 4 TROUBLESHOOTING CHECK TABLE Before taking measures make sure that the symptom reappears for accurate troubleshooting When the indoor unit has started operation and detected an abnormality of the following condition the first detection after the power ON the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes The following indicator applies regardless of shape of the indication OPERATION INDICATOR B Abnormal point Lighted Blinking Not lighted Operation indicator lamp Symptom Condition Remedy Miswiring or serial signal LEFT lamp flashes 0 5 second ON sosososo 0 5 second OFF Indoor coil thermistor Room tem perature thermistor LEFT lamp flashes 2 time flash Du pl 2 5 second OFF Indoor fan motor LEFT lamp flashes 3 time flash Y 09 oeooooosSosSosooo fie 2 5 OFF Indoor con trol system LEFT lamp flashes 4 time flash ososo Py wows ooooosSososoes jt estie 2 5 second OFF Outdoor power sys tem LEFT lamp flashes 5 time flash Y Y n n pee 2 5 second OFF Outdoor thermistors LEFT lamp flashes
9. 3 6 VDC m E 15 VDC GND high voltage DC 294 325 VDC Resistor R111 JP7 o o DB111 cut electronic control P C board CN202 Indoor electronic control P C board Room temperature thermistor RT11 CN111 Connector cable CN24 CN110 pin ICN104 oe OB Lo Receiver board CN301 1 BO los reum RECS SSO LOO wm 600 isee SENSOR t pin MOTOR MT i see SENSOR Vane motor MV1 amp pin horizontal motor MV2 D pin vertical Emergency operation switch E O SW SW1 Indoor coil thermistor RT12 RT13 CN112 Interface CN105 GND Switch board 31 Bz gt Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Resistance s s L j L l j
10. SENSOR MOTOR coil Refer 9 5 Replace pisos SENSOR MOTOR and the indoor electronic P C board Replace the varistor NR11 and fuse F11 3 3 Yes Are the varistor NR11 y burnt and the fuse F11 blown Turn OFF the power supply Check both parts side and pattern Be sure to check both the fuse side of the indoor power P C board and the varistor in any case visually Is the fuse F11 blown only No Yes X1 The fan motor connector s Q lead wire is red Y whereas is black Measure the resistance between X2 Connect of the tester to fan motor connector s CN211 and of indoor fan lead wire to lead wire otherwise the motor connector X1 2 resistance cannot be measured properly X3 Please replace the fuse after removing the indoor power P C board from the electrical box Y Is the resistance 1 or more Replace the fuse F11 andine No indoor fan motor 3 Yes Replace the fuse F11 3 Measure the resistance of Is the resistance of Replace the indoor gt tresistor R111 on the indoor J resistor R111 approximately power P C board and power P C board 390 No the indoor fan motor Ye Indoor power Fuse F11 Varistor m P C board NR11 Is the approximately 5 VDC between 5 V and JPG GND of the indoor electronic control P C board 14 111 Is there approximately 12 VDC Replace the indoor fan motor between 12 V and JPG GND
11. Screws of the panels Right panel 2 Remove the front panel Remove the screw caps of the under panel Remove the screws of the under panel 3 Pull out the right top corner of the right panel and remove the right panel 4 Pull out the left bottom corner of the left panel and remove the left panel 5 Unhook the lower part of the under panel and Under panel remove the under panel Screws of the under panel OBH683B id OPERATING PROCEDURE PHOTOS 2 Removing the indoor electrical box Photo 3 Ground wire 1 Remove the panels Refer to 1 and the right corner Electrical box box 2 Remove the screw of the V A clamp and V A clamp 3 Remove the screw of the electrical cover and the electrical cover 4 Disconnect following connectors ili 7 Indoor electronic control P C board Screw of CN151 Vane motor electrical cover lt Indoor power P C board gt CN211 Indoor fan motor 5 of CN110 DISPLAY AND i see SENSOR ASSEMBLY WU Na m he V A clamp 5 Remove DISPLAY AND i see SENSOR ASSEMBLY 6 Remove the screw of conduit cover and the conduit cover 7 Remove the screw of conduit plate the conduit plate DISPLAY AND i see and the indoor outdoor connecting wire D EC X ASSEMBLY 8 Remove the ground wire connected to the indoor heat exchanger from the electrical box 9 Remove the screw fixing the electrical box then the
12. Water cut Screw of the upper right side of the heat exchanger Photo 13 Photo 12 Screws of the left side of the heat exchanger Screw of the line flow fan OBH683B E Fixing the indoor coil thermistor x There are 2 forms of parts for fixing the indoor coil thermistor Clip shape Holder shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down About the same length N Position and procedure for mounting the clip shape part 1 Set the indoor coil 2 Check the marked thermistor in the center mounting position of the clip shape part 3 Mount the clip shape part NOTE m Mount the clip shape part on the marked position OBH683B i m Take care to avoid loss and accidental falling of the clip shape part inside the unit m Do not pull the lead wire when removing the indoor coil thermistor MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Jul 2014 No OBH683 REVISED EDITION B Distributed in Apr 2014 No OBH683 REVISED EDITION A Distributed in Feb 2014 No OBH683 Made in Japan New publication effective Jul 2014 Specifications are subject to change without notice
13. of the indoor electronic control P C CN211 board No Are connector CN102 on the indoor electronic control P C Connect the connector or repair discon Indoor electronic Kao board or lead wires discon nection control P C board nected No Replace the indoor electronic control P C board GND JPG OBH683B i How to check miswiring and serial signal error Turn OFF the power supply Y Is there rated voltage in the power supply Y Yes Turn ON the power supply Y NOTE Refer to the outdoor unit service manual Check the power supply No Is there rated voltage between the outdoor terminal block S1 and S2 No Check the wiring yres Press EMERGENCY OPERATION switch once Y Does the left lamp of OPERATION INDICATO lamp light up Confirmation of the power to the indoor unit No i Yes DIT Y Is there any miswiring poor contact or wire Is serial signal error indicated 6 minutes later disconnection of the Correct them No Yes indoor outdoor connect Yes ing wire No lt Y A X1 Miswiring may damage indoor electronic control P C Y board during the operation Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and
14. Air in Wall hole 3 9 3 16 3 1 Installation plate 2 2 L oe 2 1 9 16 Drain hose 2 3 8 21 11 16 5 16 E 2 3 8 Le 11 16 Air out erp i 1 2 5 8 2 11 16 MSZ FH09 12NA MSZ FHI 5NA amp Insulation 61 1 16 0 0 Insulation 61 1 16 0 D e liquid Line 1 4 19 11716 Flared connection 41 4 line 1 4 19 11 16 Flared connection 61 4 e Gas line 3 8 16 15 16 Flared connection 3 8 Gas line 3 8 16 15 16 Flared connection 1 2 rain hose Inslation 41 1 8 Connected part 5 8 0 0 rain hose iInslation 1 1 8 Connected part 5 8 0 0 6 OBH683B 5 WIRING DIAGRAM MSZ FHO9NA MSZ FH12NA MSZ FH15NA SYMBOL NAME D FROM OUTDOOR UNIT 77 7 id E a T Fl I5AL250V NIS 208 230V it Pigg BBN NRI ANA LUN wp VANE MOTOR 1 phase 60Hz bru RED R111 HORIZONTAL i oj LU m VANE MOTOR TO OUTDOOR UNIT N VERTICAL MES Ee I MT i see SENSOR MOTOR TO OUTDOOR UNIT LD106 CONNECTING WIRE 000 NRL VARISTOR Sol pen ici lir a
15. down to open the remote controller Slide it down further to get to the weekly timer buttons NOTE Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receives the signal of the remote controller with beeps INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of the indication Indication Operation state Room temperature D The unit is operating to reach the set temperature About 4 F 2 or more away from set temperature OBH683B The room temperature is approaching the set tem perature About 2 to 4 F 1 to 2 C from set temperature 11 39 Lighted Blinking Not lighted 8 1 COOL lt 1 OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 61 88 F 16 31 C 1 Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting When the temperature of indoor heat exchanger becomes too low the coil frost prevention mode works The indoor fan operates a
16. keep efore blinking does the left lamp of checking at least 1 minute or longer OPERATION INDICATOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep Yes The outdoor unit is abnormal No Y Y The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table Refer to outdoor unit service manual Make sure to check at least two consecutive blinking cycles X3 The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the indoor unit failure mode table Refer to 9 2 2 Make sure to check at least two consecutive blinking cycles X2 lt Releasing the failure mode recall function Y Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Y Repair the failure parts Deleting the memorized abnormal condition CD After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 8 Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4 Release the failure mode r
17. malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A 3 SPECIFICATION has been modified The value of the disconnect switch for MSZ FH15NA has been modified 8 MICROPROCESSOR CONTROL has been modified 9 TROUBLESHOOTING has been modified Revision B 4 OUTLINE AND DIMENSIONS has been modified The length of the connect pipes has been modified Some descriptions have been modified OBH683B 5 1 TECHNICAL CHANGES MSZ FHO9NA MSZ FH12NA MSZ FH15NA 1 New model OBH683B 2 PART NAMES AND FUNCTIONS MSZ FHO9NA MSZ FH12NA MSZ FH15NA Front panel Air inlet Emergency operation switch Air filter Nano platinum filter Air cleaning filter Electrostatic anti allergy enzyme filter and deodorizing fiter i see SENSOR Remote controller Remote control receiving section ACCESSORIES MSZ FHO9NA Model MSZ FH12NA MSZ FH15NA Installation plate 1 Attachment screws for the installation plate 4 x 25 mm Remote controller holder Screw for the remote controller holder 3 5 x 16 mm Black Battery AAA for the remote controller Wireless remote controller Felt tape For left or left rear piping Air cleaning filter Electrostatic anti allergy enzyme filter Air cleaning filter Deodorizing filter
18. measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 amp Is there 294 325 VDC and 9 on the power P C board between CN211 Yes rise to the range of 3 to 6 VDC within Replace the indoor fan motor and 12 seconds after EMERGENCY OPERATION switch is pressed Does the voltage between CN102 and JPG on the indoor Replace the indoor power electronic control P C board fall to Replace the indoor electronic P C board Yes 2 V or less within 12 seconds after No control P C board EMERGENCY OPERATION switch is pressed The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 Measure the voltage CN102 and while the fan motor is Is it unchanged holding gt and JPG GND on the indoor rotating 0 or 15 VDC No electronic control P C board when Yes Changed the fan motor is rotating Unchanged Replace the indoor fan motor Y Replace the indoor Replace the indoor power P C lt Is it unchanged holding electronic control P C board Yes 0 or 5 VDC N board o Unchanged Changed OBH683B S Check of remote controller and indoor electronic control P C board X Check if the remot
19. tem perature deletes timer setting Hold down the button to change the time quickly The temperature can be set between 61 F and 88 F 16 C and 31 C at weekly timer Press and buttons to continue setting the timer for other days and or numbers 4 Press button to complete and transmit the weekly timer setting Mon CsET which was blink CLOCK PM ing goes out and the current time will be displayed NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the remote controller toward the indoor unit for 3 seconds When setting the timer for more than one day of the week or one number button does not have to be pressed per each setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit OBH683B WEEKLY 5 Press button to turn the weekly timer ON T lights When the weekly timer is ON the day of the week whose timer setting is complete will light WEEKLY Press button again to turn the weekly timer OFF goes out NOTE The saved settings will not be cleared when the weekly timer is turned OFF 2 Checking weekly timer setting 1 Press button to enter the weekly timer setting mode
20. temperature thermistor 9 7 2 time flash 2 5 second OFF Indoor coil thermistor The indoor coil thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the main indoor coil ther mistor the sub indoor coil thermistor 9 7 3 time flash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 9 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan motor is operated Refer to 9 6 Check of indoor fan motor 12 time flash 2 5 second OFF Indoor control System It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 9 4 3 Operation check on i see SENSOR While recalling the failure details set the temperature to 66 F 19 C to perform the simple check on the i see SENSOR Place your hand over the i see SENSOR and the buzzer will beep at 1 second intervals Normal detection temperature range is 93 to 102 F 34 to 39 C If the buzzer does not beep check for disconnection of the connectors Set the temperature to 73 F 23 C to exi
21. the remote controller No on the remote controller x1 Yes Y Y Is noise heard from radio No Replace the remote controller Yes Y M SR Reinstall the unit away from lights within the range of 3 28 ft 2 Yes Attach a filter on receiving part No Measure the voltage between receiver P C board connector CN301 No 1 and No 3 when the remote controller button is pressed Y Yes Replace the indoor electronic Is the voltage approximately 4 VDC 5 VDC Eel P C board No Replace the receiver P C board OBH683B 2 O Check of indoor P C board and indoor fan motor Turn OFF the power supply Remove indoor fan motor connector CN211 from indoor power P C board and vane Measure the resistance of indoor fan motor connector CN151 from the indoor motor electronic control P C board and turn ON Refer to 9 5 Replace the indoor fan motor the power supply Short circuit Does the unit operate with the remote controller Measure the resistance of the vane Short circuit Does OPERATION INDICATOR lamp light I motor coil Replace the vane motor and the indoor up by pressing EMERGENCY OPERATION Yes Refer to 9 5 electronic control P C board switch No Short circuit Measure the resistance of the i see gt
22. the screws of the horizontal vane motor 4 Disconnect the connector from the horizontal vane motor 5 Remove the horizontal vane motor from the horizontal vane motor unit OBH683B 35 Screw of the vertical vane motor unit Screws of the vane motor unit cover Photo 9 Screws of the horizontal vane motor unit Screws of the horizontal vane motor Screws of the horizontal vane motor OPERATING PROCEDURE PHOTOS 7 Removing the indoor fan motor the indoor coil Photo 10 thermistor and the line flow fan Lead wire of the indoor 1 Remove the panels Refer to 1 and the right corner coil thermistor box 2 Remove the indoor electronic control P C board holder the electrical box and the nozzle assembly 3 Remove the screws fixing the motor bed 4 Release the hooks of the water cut and remove the water cut 5 Loosen the screw fixing the line flow fan 6 Remove the motor bed together with the indoor fan motor and the motor band 7 Release the hooks of the motor band and remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 10 Screws of 9 Remove the screws fixing the left side and the upper the motor bed right side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan Photo 11 to the lower left
23. upper catch of the electrical box and Photo 4 pull out the electrical box Ground wire Upper catch x When installing the electrical box pass the lead wire from the fan motor through B Photo 10 and Photo 4 so that it will not be pinched under the electrical box Lead wire holder Indoor power P C board Indoor electronic Screw of the electrical box Catch of the DISPLAY Ngcrew of SENSOR ASSEMBLY the terminal block Photo 5 _ Screw of the Screwiof the conduit plate conduit cover OBH683B i OPERATING PROCEDURE PHOTOS 3 Removing the indoor power P C board the Photo 6 switch board the display board the receiver Catch of the DISPLAY AND board and the indoor electronic control P C i see SENSOR ASSEMBLY board 1 Remove the panels Refer to 1 and the right corner box 2 Remove the indoor electrical box Refer to 2 3 Remove the ground wire connected to the electrical box from the indoor power P C board 4 Disconnect the following connectors Indoor electronic power P C board CN106 Switch board CN201 Terminal block CN202 To the indoor electronic control P C board 5 Remove the lead wire holder Photo 7 6 Remove the indoor power P C board 7 Disconnect the following connectors Indoor electronic control P C board CN111 Room temperature thermistor CN112 Indoor coil thermistor 8 Unhook the catches of the DISPL
24. 6 time flash oso 60808080000080 ela Sag 2 5 second OFF Outdoor control sys tem LEFT lamp flashes 7 time flash Du MEL A M Vu eososoeoesososooooos pil l 2 5 second OFF Other ab normality LEFT lamp flashes 14 time flash or more Ld 2 5 second OFF Indoor unit and outdoor unit do not operate The serial signal from the outdoor unit is not received for 6 minutes Refer to 9 6 How to check miswiring and serial signal er ror The indoor coil or the room temperature ther mistor is short or open circuit Refer to the characteristics of indoor coil thermistor and the room temperature thermistor 9 7 The rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 9 6 Check of in door fan motor It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual It cannot pro
25. AY AND i see SENSOR ASSEMBLY from the electrical box right side 9 Unhook the catch of the rear cover of the DISPLAY AND i see SENSOR ASSEMBLY and open the rear Cover Remove the display P C board and the receiver P C board 10 Open the switch panel and remove the switch P C board Receiver P C board OBH683B idi OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly 1 Remove the panels Refer to 1 and the right corner box 2 Remove the indoor outdoor connecting wire Refer to 2 3 Remove the electrical cover Refer to 2 4 Disconnect the following connector Indoor electronic control P C board CN151 Vane motor 5 Remove the DISPLAY AND i see SENSOR ASSEMBLY 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to 5 6 5 Removing the vertical vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screw of the vertical vane motor unit and pull out the vertical vane motor unit 3 Remove the screws of the vertical vane motor unit cover 4 Disconnect the connector from the vertical vane motor 5 Remove the vertical vane motor from the vertical motor unit cover 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Remove
26. MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL Models MSZ FHO9NA MSZ FH12NA MSZ FH15NA Changes for the Better Revision B 4 OUTLINE AND DIMENSIONS has been modified Some descriptions have been modified Please void OBH683 REVISED EDITION A No OBH683 REVISED EDITION B Outdoor unit service manual MUZ FH NA H Series OBH684 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND 4 3 eee 5 4 OUTLINES AND DIMENSIONS 6 5 DIAGRAM A nnm 7 6 REFRIGERANT SYSTEM DIAGRAM 8 7 SERVICE FUNCTIONS 9 8 MICROPROCESSOR CONTROL 11 9 TROUBLESHOOTING 20 10 DISASSEMBLY 32 PARTS CATALOG OBB683 NOTE RoHS compliant products have lt G gt mark on the spec name plate Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system
27. Setting1 Setting2 ie ON OFF 81 F 27 ia PM 8 00 PM 9 00 NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the weekly timer is set temperature can not be set to 50 F 10 The weekly timer operation and SMART SET operation cannot be used together OBH683B 1 How to set the weekly timer Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode Mon blinks SET 1 E 2 Press and buttons to select setting day and number E g Mon Sun 3500 Mon Tue Wed Thu Fri Sat Sun and 1 are selected PO Pressing selects the day of Pressing selects the week to be set the setting number pers gt Wed gt Thu gt Fri Sat Sun C 1 gt 2 gt 3 gt 4 Mon Tue Wed Thu Fri Sat Sun L All days can be selected 3 Press e and buttons to set ON OFF time and temperature E g ON AM 6 00 and SET o 75 F 24 are 1 6 00 GF selected Mon Tue Wed Thu Fri Sat Sun M Pressing ON OFF selects ON OFF timer h A A OON GOFF Pressing TIME Pressing TEMP peg Y 7 a Pressing adjusts the time adjusts the
28. TROL POWERFUL or NATURAL FLOW button 10 POWERFUL 0 operation The air conditioner automatically adjusts the fan speed and the set temperature and operates the POWERFUL mode The POWERFUL mode is cancelled automatically 15 minutes after operation starts or when POWERFUL button is pressed once again within 15 minutes after operation starts The operation mode returns to the mode prior to POWERFUL operation POWERFUL mode also is cancelled when the OPERATE STOP ON OFF ECONO COOL FAN SPEED CONTROL NATURAL FLOW or SMART SET button is pressed within 15 minutes after operation starts or operation mode is changed OBH683B 2 Vertical vane 1 Vane motor drive These models are equipped with a stepping motor for the vertical vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from microprocessor 2 The vertical vane angle and mode change as follows by pressing WIDE VANE CONTROL button 3 Positioning 1 1 2 1 9 3 4 5 R sm SWING To confirm the standard position the vane moves until it touches the vane stopper Then the vane is set to the select ed angle Confirming of standard position is performed in the following cases a OPERATE STOP ON OFF button is pressed POWER ON 4 SWING zw MODE By selecting SWING mode with WIDE VANE CONTROL button the vertical vane swings horizontally The remote controller di
29. e controller is exclusive for this air conditioner Press OPERATE STOP ON OFF button on the remote controller x 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital Is LCD display on the remote n camera or a camera phone It is normal if the LED of controller visible gt Replace the batteries Refer to 9 1 4 the signal transmitting section lights up when the OP i No Not clear ERATE STOP ON OFF button on the remote control Yes ler is pressed However it may be difficult to see the illuminated LED of the signal transmitting section with a Remove the batteries then set them smartphone camera ran ano RESET button 2 If the inverter fluorescent light is turned on when the is a Fs ith th room is cool the unit may have difficulty receiving the ci signal from the remote controller or may not be able to remote controller operate with it if the inverter fluorescent light is turned on when the room is warm the unit may be able to Assign a number of remote controller operate with the remote controller Does the unit operate with the Refer to 7 2 m gt remote controller No Check if the unit operates with the remote controller Yes Y OK Turn ON a radio to AM and press Does the unit operate with gt OPERATE STOP ON OFF button
30. e horizontal vane returns to the closed position a When OPERATE STOP ON OFF button is pressed POWER OFF b When the operation is stopped by the emergency operation c When ON TIMER is ON standby 6 Dew prevention During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour the vane angle automatically changes to Angle 3 for dew prevention 7 SWING X4 mode By selecting SWING mode with VANE CONTROL button the horizontal vanes swing vertically When COOL DRY or FAN mode is selected only the upper vane swings 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat off this control does not work in the indoor unit 9 ECONO COOL operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 4 F 2 C higher by the microprocessor However the temperature on the LCD screen on the remote controller is not changed Also the hori zontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL VANE CON
31. ecall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized X2 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval wie Je dee dd p 4 gt mp II t prb de OFF MX x7 ex G7 ex lt gt Repeated cycle Repeated cycle Repeated cycle 3X3 Blinking pattern when the outdoor unit is abnormal Tun Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON Second interval 2 5 second OFF second OFF second ON second ON second interval p Jo F Je Meg ores L LI l BUR SUR D h i gt La 4 a No beep Beeps No beep Beeps gt lt t Repeated cycle Repeated cycle Repeated cycle OBH683B u 2 Indoor unit failure mode table The left lamp of the OPERATION INDICATOR lamp Abnormal point Failure mode Condition Remedy Not lighted Normal 1 time flash every 0 5 second Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds dur ing operation Refer to the characteristics of the room
32. erature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 F 1 C above the set temperature 8 6 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motors for the horizontal vanes The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor L VANE R 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button pem 1 2 334 4 gt NOTE The right and left horizontal vanes set to the same level may not align perfectly OBH683B P 3 Positioning To confirm the standard position the vane move until it touches the vane stopper Then the vane is set to the select ed angle Confirming of standard position is performed in the following cases a When the operation starts or finishes including timer operation b When the test run starts c When standby mode only during multi system operation starts or finishes 4 AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tem perature distribution In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position Vane angle is fixed to Angle 4 Horizontal position 5 STOP operation OFF and ON TIMER standby In the following cases th
33. for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally Remove the front lid and insert batteries Press RESET button with a thin instrument and Then reattach the front lid then use the remote controller Insert the negative pole of the batteries first Check if the polarity 9 of the batteries is correct RESET button NOTE 1 If RESET button is not pressed the remote controller may not operate correctly 2 This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement 3 Do not use the leaking batteries OBH683B a 9 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 9 4 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall
34. function Turn ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Make sure that the indicators on the LCD screen shown in the right figure are all displayed Then release the but tons Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 X1 Regardless of normal or abnormal condition a short beep is emitted once the signal is received Does the left lamp of the OPERATION INDICA TOR lamp on the indoor unit blink at the interval of Indoor unit is normal 0 5 seconds 2 But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal No malities that cannot be recalled with this way Beep is emitted at the same timing as the Ch ti j E OFF eck if outdoor unit is abnormal according to the detailed outdoor unit blinking of the left lamp of OPERATION failure mode recall function INDICATOR lamp 2 Yes NOTE It takes up to 1 minute to indicate the outdoor unit abnormality Judgment of indoor outdoor abnormality Blinks Even if the OPERATION INDICATOR lamp is not lighting
35. h temperature changes significantly is present Some heat sources such as a small child or pet may not be sensed A heat source and the air conditioner are more than 20 ft 6 m apart A heat source does not move for a long time 8 10 INDIRECT DIRECT MODE The INDIRECT DIRECT mode offers finely tuned operation by locating where an occupant is in the room 1 Press INDIRECT DIRECT button during COOL DRY HEAT or AUTO mode to activate INDIRECT DIRECT mode This mode is only available when the i see control mode is effective 2 Each press of INDIRECT DIRECT button changes INDIRECT DIRECT in the following order pm C INDIRECT DIRECT OFF C amp INDIRECT An occupant will be less exposed to direct airflow amp DIRECT Mainly the vicinity of an occupant will be air conditioned NOTE Horizontal and vertical airflow directions will be automatically selected If you still feel uncomfortable with the air direction determined by the INDIRECT mode adjust the air direction manually Cancelling the i see control mode automatically cancels the INDIRECT DIRECT mode INDIRECT DIRECT mode is also cancelled when the VANE or WIDE VANE buttons is pressed Do not touch the i see SENSOR This may cause malfunction of the SENSOR OBH683B 8 11 NATURAL FLOW 34 OPERATION In NATURAL FLOW operation air flow will become more like natural wind An occupant will not be directly exposed to t
36. he air flow and feel more comfortable 1 Press NATURAL FLOW button during COOL or FAN mode to start NATURAL FLOW operation 2 Press NATURAL FLOW button again to cancel NATURAL FLOW operation NATURAL FLOW operation is also cancelled when the POWERFUL or ECONO COOL button is pressed NOTE As the fan speed changes constantly during NATURAL FLOW operation the sound of air flow wind velocity and air flow temperature also change This is not a malfunction 8 12 SMART SET i OPERATION 1 How to set SMART SET operation 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT or ECONO COOL mode 3 Press SMART SET button 4 Set the temperature fan speed and airflow direction for SMART SET operation NOTE SMART SET operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode SMART SET operation is 50 F 10 and 61 88 F 16 31 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT SMART SET operation and the weekly timer operation cannot be used together 2 How to cancel operation Press SMART SET button again SMART SET operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing SMART SET button 8 13 EMERGENCY TEST OPERATION In the case of test run operation or emergency operation use Operation mode COOL HEAT EMERGENCY OPERATION switch on the righ
37. he power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the electromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise OBH683B 9 7 TEST POINT DIAGRAM AND VOLTAGE Indoor power P C board Indoor electronic control P C board Receiver board Display board Switch board MSZ FHOONA MSZ FH12NA MSZ FH15NA Fuse F11 Indoor power P C board Connector Terminal Block res c CN201 l 5 vbc ezee ili ea s gy Z x 4 y GND n o M 5 B m 4 MK y PIS Connector to indoor Varistor NR11 Indoor fan motor CN211 0 or 15 VDC
38. he room tem perature is low or when defrosting is being done the indoor fan will stop or rotate in Very Low speed 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of outdoor heat exchanger becomes too low The compressor stops once the indoor outdoor fans stop the 4 way valve reverses and the compressor re starts This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes OBH683B 8 5 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with AUTO operation from OFF If the room temperature is higher than the set temperature operation starts in COOL mode If the room temperature is equal to or lower than the set temperature operation starts in HEAT mode 2 Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 F 1 C below the set temp
39. ltage Refer to How to check inverter com pressor Refer to Check of R V coil Refer to 9 6 B Check of remote controller and indoor electronic 1 Check indoor out door connecting wire Check if the power is supplied to the indoor control P C unit Refer to 9 6 Check of indoor P C board and indoor fan motor board LEFT lamp Flash on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal LEFT lamp LEFT lamp 2 time flash 3 time flash Cause Cause Indoor unit Indoor unit Trouble Trouble of of room indoor fan temperature motor indoor coil thermistor LEFT lamp LEFT lamp LEFT lamp 4 time flash 5 time flash 6 time flash Cause Cause Cause Indoor unit Outdoor unit Outdoor unit Trouble Outdoor Trouble of of indoor power thermistor in unit control system outdoor unit system abnormality LEFT lamp 7 time flash Cause Outdoor unit Trouble of outdoor con trol system LEFT lamp 14 time flash or more Cause Outdoor unit Other ab normality Refer to 9 6 OBH683B Check room 9 7 Test point diagram and voltage Refer to 9 6 Check of indoor fan motor Refer to How to check inverter com pressor Replace the indoor elec tronic control P C board outdoor ther mistors
40. n mode the set temperature and the fan speed are memorized by the indoor electronic control P C board AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation CD If the main power has been cut the operation settings remain 0 After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running How to disable AUTO RESTART FUNCTION CD Turn off the main power for the unit amp Cut the jumper wire to JR77 on the indoor electronic control P C board Refer to 9 7 Indoor electronic control P C board JR77 NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled f the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breaker OFF due to the rush of starting current systematize other home appliance not to turn ON at the same time When some air conditioners are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at
41. o an indoor unit will be regarded as the remote controller for the indoor unit Once they are set the indoor unit will only receive the signal from the assigned remote controller afterwards 7 3 SETTING THE INSTALLATION POSITION Be sure to set the remote controller according to the installed position of the indoor unit Installation position Left Center Right Left Distance to objects wall cabinet etc is less than 50 cm to the left Center Distance to objects wall cabinet etc is more than 50 cm to the left and right o Right Distance to objects wall cabinet etc is less than 50 cm to the right The installation position can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited WIDE VANE 1 Hold down button on the remote controller for 2 seconds to enter the position setting mode WIDE VANE WIDE VANE 2 Select the target installation position by pressing button Each press of the button displays the positions in order center right left EDIT SEND 3 Press button to complete the position setting Installation position Left Center Right Remote controller display OBH683B Y 7 4 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operatio
42. or WB 67 73 57 DB 95 115 14 Standard temperature Maximum temperature Minimum temperature Maximum humidity Standard temperature Maximum temperature Minimum temperature Cooling 60 67 60 47 75 13 Heating 3 2 OUTLET AIR SPEED AND COVERAGE e The air coverage is the figure up to the position where the air speed is 1 ft s when air is blown out horizontally from the unit properly at the High speed position The coverage should be used only as a general guideline since it varies according to the size of the room and furniture arranged inside the room Air speed ft s 19 5 17 0 14 6 20 3 17 8 15 3 22 2 18 3 15 7 OBH683B i Model Function Coverage ft 29 8 26 1 22 5 31 0 27 3 23 5 33 8 28 0 24 1 Dry Dry Wet Dry Dry Wet Dry Dry MSZ FHO9NA MSZ FH12NA MSZ FH15NA 4 OUTLINES AND DIMENSIONS MSZ FHO9NA MSZ FH12NA MSZ FH15NA 1 16 x 1 1 16 Oblong hole Installation plate Unit inch 1 16 x 13 16 Oblong hole 4 16 41116 2 36 1 16 RE 35 5 8 38 ey A dL cu Y 8 1 8 16 3 4 Indoor i 2 5 8 15 9 16 14 11 16 gt 39 16
43. perly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board Refer to outdoor unit service manual An abnormality other than above mentioned is detected Check the stop valve Check the 4 way valve Check the abnormality in detail using the failure mode recall function for outdoor unit Outdoor control sys tem Y LEFT lamp lights up OBH683B Outdoor unit does not oper ate It cannot properly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board 24 Check the blinking pattern of the LED on the inverter P C board or the outdoor electronic control P C board 9 5 TROUBLE CRITERION OF MAIN PARTS MSZ FHO9NA MSZ FH12NA MSZ FH15NA Part name Check method and criterion Figure Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Measure the resistance with a tester Refer to 9 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan motor MF Check 9 6 Check of indoor fan motor Vane motor MV1 HORIZONTAL Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire RED SKY Normal 262 3280
44. quipment Turn OFF the power supply and then turn ON again and JPG on the indoor electronic Is there 2 VDC or less between CN202 Press EMERGENCY OPERATION Switch control P C board ye Reinstall either the unit or the light board Is there 2 VDC or less between CN202A 8 and JPG GND on the indoor electronic control P C Is there 2 VDC or less between CN202 8 and JPG GND on the indoor electronic control P C Yes board away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later Replace the indoor power P C board of the indoor Replace the indoor elec tronic control P C board Yes No unit OBH683B 29 E Electromagnetic noise enters into TV sets or radios Is the unit grounded No Ground the unit Yes Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit and the indoor unit within 9 91 ft 3m or is the distance between the antennas Yes and the outdoor unit within 9 91 ft 83m No the distance between the antennas dios and the indoor unit within 3 28 ft 1m Is the distance between the TV sets or ra Extend the distance between the TV sets and or or is the distance between the TV sets or
45. radios and the indoor unit or the TV sets or radios and the outdoor unit within Yes radios and the outdoor unit 9 91 ft 3m No Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of gt connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas the antennas damaged Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring ground wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF t
46. restart Therefore the special counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one OBH683B x 8 MICROPROCESSOR CONTROL MSZ FHOONA MSZ FH12NA MSZ FH15NA WIRELESS REMOTE CONTROLLER Operation display section Temperature buttons A MITSUBISHI ELECTRIC Signal transmitting section Distance of signal About 20 ft 6 m Beep s is are heard from the indoor unit when the signal is received TEMP OONOFF FAN SPEED CONTROL button Sox sec Pall Mon Tue Wed Thu Fri Sat Sun CSET AMPH AMPM 1234 Sor 06 89588 98 TEMP QON OFF Lv JL aJl 9 C DIRECTIDIRECT SMART SET button OPERATION SELECT button Lv IL HL oe MODE FAN AWIDE VANE ECONO COOL button s mme WIDE VANE button quus AER VANE CONTROL bution POWERFUL button a mer VANE CONTROL button INDIRECT DIRECT button NATURAL FLOW button OPERATE STOP ON OFF button FORWARD button TIME TIMER set zu BACKWARD button WEEKLY TIMER set buttons I CLOCK button Indication of c lt Lid remote controller model is on back Slide the lid
47. splays mw Swing mode is cancelled when WIDE MODE CONTROL button is pressed once again 8 7 TIMER OPERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 12 00 AM blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK button How to set the current time a Press the CLOCK button b Press the TIME SET buttons and Cv to set the current time Each time FORWARD button CA is pressed the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK set button 2 Press OPERATE STOP ON OFF button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button eoN during operation b Set the time of the timer using TIME SET buttons and x OFF timer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and x x Each time FORWARD button CZ is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button ecrr
48. t side of the indoor unit Set temperature 75 F 24 C Emergency operation is available when the remote controller is missing or has failed or when the batteries in the remote controller are running down The unit will start and OPERATION INDICATOR lamp will light up The first 30 minutes of operation is the test run operation This opera tion is for servicing The indoor fan runs at High speed and the tem Fan speed Med Horizontal vane Auto The operation mode is indicated by the Operation Indicator lamp as following perature control does not work Operation Indicator lamp After 30 minutes of test run operation the system shifts to EMERGENCY COOL O EMERGENCY COOL HEAT MODE with a set temperature of 75 F 24 The fan speed shifts to Medium EMERGENCY HEAT o x Lighted The coil frost prevention works even in the test run or the emergency Not lighted operation STOP In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION Switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start Emergency operation switch NOTE Do not press EMERGENCY OPERATION switch during normal 7 SW operation 8 14 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 min
49. t the set speed and the compressor stops This mode continues until the temperature of indoor heat exchanger rises 2 Low outside temperature operation When the outside temperature is lower low outside temperature operation starts and the outdoor fan slows or stops 8 2 DRY OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select DRY mode with OPERATION SELECT button 3 The set temperature is determined from the initial room temperature 1 Coil frost prevention Coil frost prevention works the same way as that in COOL mode 8 1 1 2 Low outside temperature operation Low outside temperature operation works the same way as that in COOL mode 8 1 2 8 3 FAN 3 OPERATION 1 OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select FAN mode with OPERATION SELECT button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 8 4 HEAT 5 OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 61 88 F 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or t
50. t the simple check mode on the i see SENSOR The left lamp of the OPERATION INDICATOR lamp Abnormal point Failure mode Condition Remedy 6 time flash i see SENSOR OBH683B Poor contact in i see SENSOR wiring Failure in loading corrected data of i see SENSOR 22 Check for disconnection of the connectors 9 3 INSTRUCTION OF TROUBLESHOOTING Start X Test Run operation means the operation within 30 minutes af ter EMERGENCY OPERATION Switch is pressed If blinking of OPERATION INDI CATOR lamp cannot be checked it can be checked with failure mode recall function Y Indoor unit ates Outdoor unit does not operate Indoor unit oper Outdoor unit does not operate normally ates Indoor unit does not receive the signal from re mote controller LEFT lamp of the OPERA TION INDICATOR lamp is flashing ON and OFF Outdoor unit Outdoor unit operates only does not in Test Run operate even operation in Test Run operation Unit does not operate nor mal operation in COOL or HEAT mode Indoor unit Indoor unit does operates when not operate when EMERGENCY EMERGENCY OPERATION OPERATION Switch is pressed Switch is pressed Check room temperature thermistor Refer to 9 7 Test point diagram and vo
51. temperature thermistor RT11 Flared connection Refrigerant pipe 21 4 with heat insulator Refrigerant flow in cooling gt Refrigerant flow in heating OBH683B Unit inch 7 SERVICE FUNCTIONS MSZ FHO9NA MSZ FH12NA MSZ FH15NA 7 1 TIMER SHORT MODE For service the following set time can be shortened by bridging JPG and JPS on the electronic control P C board Refer to 9 7 Set time 3 minutes 3 seconds It takes 3 minutes for the compressor to start operation However the starting time is shortened by bridging JPG and JPS 7 2 HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT A maximum of 4 indoor units with wireless remote controllers can be used in a room To operate the indoor units individually with each remote controller assign a number to each remote controller according to the number of the indoor unit This setting can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited 1 Hold down button on the remote controller for 2 seconds to enter the pairing mode 2 Press button again and assign a number to each remote controller Each press of button advances the number in the following order 1 gt 2 gt 3 4 EDIT SEND 3 Press button to complete the pairing setting After you turn the breaker ON the remote controller that first sends a signal t
52. utes as 3 minute time delay function operates to protect compressor from overload OBH683B bi 9 TROUBLESHOOTING MSZ FHO9NA MSZ FH12NA MSZ FH15NA 9 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and then after confirming the horizontal vane is closed turn OFF the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the P C board 3 When removing the P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires Incorrect Correct Lead wiring Housing point 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting serv ice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern

SERVICE MANUAL MSZ-FH09NA MSZ-FH12NA MSZ

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