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SERVICE MANUAL

1. No E es Ye control receiv ing section of the indoor unit 32 OBH548D MSZ GE24NA MSY GE24NA L Turn OFF the power supply Y Is there rated voltage in the power supply Y Yes Turn ON the power supply Y No Check the power supply Is there rated voltage between outdoor terminal block S1 and S2 No Check the wiring yres Press EMERGENCY OPERATION switch once Does the OPERATION Y INDICATOR lamp light up Confirmation of the power to the indoor unit Yes Y Is serial signal error indicated 6 minutes later Yes Y Is there any miswiring poor contact or wire disconnection of the indoor outdoor connect ing wire Yes Correct them No lt Y A Y B Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and S3 1 Y Turn ON the power supply Y x1 X3 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts 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 or the outdoor electronic control P C board is normal LED blinks 6 ti
2. lt hy pid MEE Indoor unit 1 15 16 4 38 n Installation plate hole 23 3 e Pipin Es a t TN L 7 1 8 _ E HM 2316 70 4 718 2 65 16 Drain hose Air ou 7 14 3 33 1 8 Insulation 22 O D Liquid line 3 8 19 11 16 Flared connection 23 8 Gas line 1 2 16 15 16 Flared connection 25 8 Drain hose _ Insulation 1 1 8 Connected part 25 8 Piping 6 1 4 uy 2 1 2 OBH548D 5 WIRING DIAGRAM MSZ GEO6NA MSZ GE09NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GE09NA MSY GE12NA MSY GE15NA MSY GE18NA FROM OUTDOOR UNIT omer CONNECTING WIRES 7 35 LD201 P 0101 0104 DIODE PONER SUPPLY I His Nel tare m p dum T3 15AL250V UNIT is a FAN MOTOR O VANE MOTOR 12 HORIZONTAL O NRIL VARISTOR TD OUTDOOR UNIT RESISTOR ROOM TEMP RTII THERMISTOR COIL TEMP RTI THERMISTOR MAIN COIL TEMP NOTES RTI3 THERMISTOR SUB About the outdoor side electric wiring refer to the outdoor unit electric wiring Till TRANSFORMER diagram for servicing 2 Use copper conductors only For field wiring TERMINAL BLOCK INDOOR ELECTRONIC CONTROL P C BOARD 3 Symbols indicate CLO Ter
3. Upper lamp flashes 4 time flash oso Dad wvosooooosSosoesoe TA h A 2 5 second OFF Outdoor power sys tem Upper lamp flashes 5 time flash g Aa eosososoeooooosSoso 2 5 second OFF Outdoor thermistors Upper lamp flashes 6 time flash 080 f 0808080000080 2 5 second OFF Outdoor control sys tem Upper lamp flashes 7 time flash weosoeoeoeosoeooooos 2 5 second OFF Other ab normality Upper lamp flashes 14 time flash 6008008080808 000000000000 ae 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 verte
4. o 2 Sone s Eos AD ZA Beis V amp Ed j se Gay Jevistovisn NS Eu zB t 2 ox x 2 EE o 4 89 Power monitor receiver SW board Een mre TUR I i 3 MT 4 pim cla fog T PE crag LIU Rer ae b dr iss exce bi RC P S c192 S oo E Quee OL x gm 9 3 gt 2 CN20A Je sg EL EIL 5 9 C er Jew bi 9 slong Th S il RS OX Refer to 9 6 zu a iake CAUTION Indoor fan motor DM00N335 E n CN211 Emergency Timer short mode point 294 325 VDC operation switch JPG JPS Refer to 7 1 GND E O SW high voltage DC SW1 15 VDC 3 6 VDC 0 or 15 VDC Please replace the fuse after removing the indoor terminal board from the electrical box Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 0 Resistance 5 Jj B i 32 50 68 86 104122 140 Temperature F OBH548D 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 detach
5. Y Indoor electronic control P C board es 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and Remove the foreign matter and If more than 12 seconds passes after EMERGENCY OPERATION switch adjust the line flow fan is pressed the voltage measured at 2 above goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 ls there 294 325 tonto C oannes Leder L between CN211 DE g anie Ci Yes of 3 to 6 VDC within 12 seconds after Replace heindoor fanmotor EMERGENCY OPERATION switch is pressed No No Replace the indoor electronic control P C Replace the indoor electronic control board and the indoor terminal P C board P C board 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 ls it h d holdi Replace the indoor and while the fan motor is olaing electronic control P C tatin 0 or 15 VDC No board Changed Yes Unchanged Replace the indoor fan motor OBH548D Check of remote controller and indoor electronic control board Check if the remote controller is exclusive for this air conditioner MSZ GE06 09 12 15 18NA MSY GE09 12 15 18NA Press OPERATE STOP ON OFF
6. 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT MSZ 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 in SMART SET operation is between 50 F 10 and 61 87 F 16 31 C MS2 2 settings can be saved One for COOL ECONO COOL one for HEAT MSZ 1 setting can be saved MSY 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 will be selected from the next time by simply pressing SMART SET button 8 10 EMERGENCY TEST OPERATION In the case of test run operation or emergency operation use EMERGENCY OPERATION switch on the right side of the indoor unit Emergency operation is available when the remote controller is missing has failed or when the batteries in the remote Operation mode COOL HEAT MSZ controller running down The unit will start and OPERATION Set temperature 75 F 24 C 75 F 24 C INDICATOR lamp will light up Fan speed Med Med The first 30 minutes of operation is the test run operation This Horizontal vane Auto operation is for servicing The indoor fan runs at High speed and the temperature control does not work After 30 minutes of te
7. Be sure to check both the fuse tern side of the indoor terminal P C and the varistor in any case board visually N Is the fuse F11 blown only No Yes 3 1 The fan motor connector s lead wire is red whereas is black Measure the resistance between X2 Connect o of the tester to fan motor connector s CN211 and of indoor fan lead wire and to lead wire otherwise the motor connector X1 2 resistance cannot be measured properly X3 Please replace the fuse after removing the indoor terminal P C board from the electrical box Y Replace the fuse F11 and the i Is the resistance 1 or more No indoor fan motor X3 Yes Replace the fuse F11 Replace the indoor Measure the resistance of resistor Is the resistance of power P C board the gt 111 on the indoor power resistor R111 approxi N indoor terminal P C board mately 4 9 board and the indoor fan motor ndoor electronic control P C board JPG GND Is there approximately 5 VDC between 5 V and JPG GND of the indoor electronic control P C board Is there approximately 9 to 13 VDC Replace the indoor fan motor between 12 V and JPG GND of the indoor electronic control P C board CN10A No 12 VDC Y Are connector CN10A on the indoor electronic control P C Connect the connector or repair 5 VDC I h board or lead w
8. OBB548 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 malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A e MSZ GE24NA and MSY GE24NA have been added Revision B e MSZ GE06 09 12 15 18NA 8 and MSY GEO09 12 15 18NA 8 have been added Revision C Specification has been corrected The value of Moisture removal for MSZ GE24NA and MSY GE24NA has been corrected 2 7 pt h 5 1 pt h Revision D e MSZ GE06 09 12 15 18NA L9 and MSY GE09 12 15 18NA L9 have been added 1 TECHNICAL CHANGES MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA 1 New model MSZ GEO6NA MSZ GEO06NA m MSZ GEO9NA MSZ GEO09NA 2 MSZ GE12NA gt MSZ GE12NA MSZ GE15NA gt MSZ GE15NA m MSZ GE18NA gt MSZ GE18NA 5 MSY GEO9NA gt MSY GEOONA m MSY GE12NA gt MSY GE12NA 5 MSY GE15NA MSY GE15NA 5 MSY GE18NA MSY GE18NA 5 1 These models have b
9. Weight 22 37 External finish Munsell 1 0Y 9 2 0 2 Control voltage by built in transformer 12 24 VDC NOTE Test conditions are based on AHRI 210 240 498 385 300 237 170 498 385 304 240 194 661 562 420 347 OBH548D 7 3 1 OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V Min 187 208 230 Max 253 Indoor unit 1 phase 60 Hz 2 OPERATION Intake air temperature F Condition Indoor Outdoor WB DB Standard temperature 67 95 Maximum temperature 73 115 Minimum temperature 57 14 Maximum humidity Standard temperature 60 47 Heating Maximum temperature 67 75 Minimum temperature 60 4 Cooling 3 2 OUTLET AIR SPEED AND COVERAGE Air speed e The air coverage is the figure up to the Model Fungtion ft s Coverage ft position where the air speed is 1 ft s Dry 20 6 29 5 when air is blown out horizontally from MSZ GE06NA Dry 16 3 235 properly at the High speed posi 14 5 21 0 The coverage should be used only as a Dry 20 6 29 5 general guideline since it varies accord MSZ GEO9NA ing to the size of the room and furniture MSY GEO9NA Dry 16 3 23 5 arranged inside the room 14 5 21 0 Dry 20 6 29 5 Dry 16 3 23 5 14 5 21 0 Dry 234 33 5 Dry 21 3 30 5 19 5 28 0 Dry 25 9 36 9 Dry 21 3 30 5 19 5 28 0 Dry 18 0 36 9 18 0 36 9 16 1
10. only during multi system operation starts or finishes OBH548D k 4 VANE AUTO mode The microprocessor automatically determines the vane angle to make the optimum room temperature distribution In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position Vane angle is fixed to Angle 5 Horizontal position 5 5 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position 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 1 for dew prevention 7 SWING mode By selecting SWING mode with VANE CONTROL button the horizontal vane swings vertically 8 Cold air prevention in HEAT operation MSZ 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 Zi operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 4 F 2 C higher Also the horizontal vane swings in various cycle SWING operation makes you fe
11. 33 2 MSZ GE12NA MSY GE12NA MSZ GE15NA MSY GE15NA MSZ GE18NA MSY GE18NA MSZ GE24NA B MSY GE24NA ry OBH548D x 4 OUTLINES AND DIMENSIONS MSZ GEO6NA MSZ GE09NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSZ GEO06NA 9 MSZ GEO09NA s 12 MSZ GE12NA 15 s 52 15 18 Unit inch MSZ GE18NA 7 16x13 16 Oblong hole 3 118 N 31 7 16 i 30 15 16 ee HH 1 7 16x1 Oblong hole 3 1 8 878 __ 8 7 8 Installation plate St is lt 1 4 1 e e 5 1 N SL Rf dn Indoor unit 11 5 8 d 6 1 8 6 1 8 E 13 5 16 ME 13 9 16 gt 2 1 8 Air in Wall hole 22 9 16 g Installation plate Pipin Ll Tb 1 3 4 I 1 15 16 24 3 8 5 18 3 n Drain hose 2 5 16 3 4 Air out x m T B Insulation 21 3 8 O D i s 9 Liquid line 01 4 19 11 16 Flared connection 1 4 I Flare
12. 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 unit first with the remote controller and then after confirm ing 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 of the connector housing DO NOT pull the lead wires Incorrect Correct Lead wiring Connector housing 3 Troubleshooting procedure 1 First 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 ser vice work 2 Before servicing check that the connector and terminal are connected properly 3 When the P C board seems to be defective check the copper foil pattern 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 re
13. Install the indoor coil thermistor in its former position when assembling it Photo 9 10 Remove the screws fixing the left side of the heat exchanger 11 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 7 Electrical box Screw of the electrical cover Screw of the clamp X Power monitor receiver holder Screw of the water cut OBH548D Photo 8 Screw of the line flow fan Indoor coil thermistor main RT12 Screw of the motor band Screws of the motor bed Indoor coil thermistor sub RT13 Photo 10 Screws of the heat exchanger 46 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor When fixing the indoor coil thermistor to the clip shape holder shape part the Clip shape Holder shape lead wire should point down About the same length Position and procedure for mounting the clip shape part 1 Set the indoor coil 2 Check the marked 3 Mount the thermistor in the center mounting position clip shape part of the clip shape part NOTE m Take care to avoid loss and accidental falling of the clip shape part inside the unit m Mount the clip shape part on the marked position m Do not pull the lead wire when removing the indoor coil thermistor OBH548D X MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 J
14. P C board Resistor R111 10 ewe us Dios D104 ZV 1 e ta 40z07 Connector to indoor electronic Ole 08 jog og D102 cit 201118113 control board CN20A Please replace the fuse after removing the indoor terminal board from the electrical box MSZ GE06 09 12 15 18NA MSY GE09 12 15 18NA 2 Indoor electronic control P C board Timer short mode point JPG JPS Refer to 7 1 ci93 eni28 JRO1 JRI9 JR20 Jes 608 CN112 o N Emergency operation switch E O SW SW1 OBH548D z 8 6 s u o o on I Go 0 y ES o gt d s o o Ld o 4 o o o Hata S 8 8 00000 o oe o id Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 2 9 oW d 8 2 lg 5 Y 5VDC 12VDC G
15. antennas and the indoor unit within 9 91 ft 3 m or is the distance between the antennas Yes and the outdoor unit within 9 91 ft 3 m No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit and the indoor unit within 3 28 ft 1 m or is the distance between the TV sets or radios Yes and the outdoor unit within 9 91 ft 3 m radios and the indoor unit or the TV sets or radios and the outdoor unit No Are the antennas damaged 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 i 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 Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service 1 2 3 4 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave Channel frequency broadcast station affected by the electromagnetic noise Channel frequency broadcast station unaffected by the electr
16. board Including the receiver Y Does the unit operate with the remote controller No MSZ GE24NA MSY GE24NA Press OPERATE STOP ON OFF button on the remote controller Y US Oh tho Tore controller No Replace the batteries Refer to 9 1 4 1 Look at the image of the signal transmitting section of Not clear the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting section lights up when the OP ERATE STOP ON OFF button on the remote control Yes Remove the batteries then set them back and press RESET button Refer to 9 1 4 ler is pressed However it may be difficult to see the Check if the unit operates with the remote illuminated LED of the signal transmitting section with a controller smartphone camera 2 If the inverter fluorescent light is turned on when the Y room is cool the unit may have difficulty receiving the dor the unit operate with the remote Turn ON a radio to AM and press OP signal from the remote controller or may not be able to ERATE STOP ON OFF button on the operate with it if the inverter fluorescent light is turned controller No remote controller x1 on when the room is warm the unit may be able to Yes 7 operate with the remote controller Is noise heard from radio No Replace the remote controller pe Are there any
17. 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 Y camera or a camera phone It is normal if the LED of Is LCD displ h I the signal transmitting section lights up when the OP e See Onine remot 90 Replace the batteries Refer to 9 1 4 ERATE STOP ON OFF button on the remote control visible No ler is pressed However it may be difficult to see the Yes Not clear illuminated LED of the signal transmitting section with a smartphone camera Remove the batteries then set them back and press RESET button Refer to 9 1 4 Check if the unit operates with the remote controller 2 If the inverter fluorescent light is turned on when the room is cool the unit may have difficulty receiving the signal from the remote controller or may not be able to operate with it if the inverter fluorescent light is turned on when the room is warm the unit may be able to Turn ON a radio to AM and press OP operate with the remote controller ERATE STOP ON OFF button on the remote controller x1 Yes Y Is noise heard from radio No Replace the remote controller Je Are there any fluorescent lights of Reinstall th it f light inverter or rapid start type within the Y SA MS 1 range of 3 28 ft 1m x2 es ach a filter on receiving part T Replace the indoor electronic control P C
18. disable Auto restart function Fuse Terminal Varistor RT12 RT13 11 amp block NR11 CN112 12 VDC solder the Jumper wire to JRO7 Refer to 7 3 Rit e DMOON329 7 EN DM76Y837G lt SENS Room temperature k o o O o9 e ot St gt thermistor RT11 cese z 2 CENE 2 5 Ep i Apa Sa mol wm 0 We 9 e ew o o o o Xo z U is ceres a C53 2 Jer OI oo Js 8 D 5 52 51 2 T GL C
19. fluorescent lights of inverter or rapid start type within the range of 3 28 ft 1m x2 la Measure the voltage between power moni tor receiver SW P C board connector CN20A No 2 and No 3 when the remote controller button is pressed Refer to 9 7 3 Reinstall the unit away from lights Attach a filter on receiving part Y Replace indoor electronic control 2 lo OBH548D 29 Check of indoor board and indoor fan motor MSZ GE06 09 12 15 18NA MSY GE09 12 15 18NA 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 gt motor electronic control board and turn 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 gt 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 Replace the varistor NR11 and fuse F11 3 Yes Are the varistor NR11 burnt and the fuse F11 blown Turn OFF the power supply Check both parts side and pat
20. indicated 6 minutes later No o Y Is there any miswiring poor contact or wire disconnec tion of the indoor outdoor connecting wire No Correct them Yes lt A Y Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and S3 1 Turn ON the power supply Y X1 x3 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts 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 or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Except for outdoor unit of multi system type Is the bus bar voltage of the inverter P C board or the outdoor electronic control to TEST POINT DIAGRAM AND VOLTAGE in the outdoor service manual P C board normal Refer Check of power supply N gt Refer to the outdoor service manual i Does the LED on the inverter P C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking gt x3 yes Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Turn ON the power supply Is there rated voltage between indoor terminal bloc
21. 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 OFE second interval 2 5 second OFF second interval gt 4 ox SERE T Tir OFF pal gt gt gt gt gt lt gt Beeps Beeps f Beeps Repeated cycle Repeated cycle i Repeated cycle X3 Blinking pattern when the outdoor unit is abnormal Blinking at 0 5 Blinking at 0 5 _2 5 OFE 3 second ON Second interval Z 5 second OFE 3 second ON second interval oe Luc S OFF E r lt lt p 7 No bee Beeps No beep Beeps Repeated du Repeated cycle Repeated cycle OBH548D 2 Indoor unit failure mode table Upper lamp of OP ERATION INDICA TOR 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 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 si
22. not operate Turn OFF the power supply Pay enough attention to the high voltage on the fan motor connector Turn ON the power supply wait 5 seconds or more and then press 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 Is there any foreign matter that interferes the rotation of the line flow fan No ON again then measure the voltage lt Indoor power P C board gt 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 CN10A and JPG GND R the forei tt d adeste iwi X If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 Is there 294 325 VDC and on the power P C board O gt between CN211 Yes rise to the range of 2 to 6 VDC within and 12 seconds after EMERGENCY OPERATION switch is pressed F Does the voltage between CN10A and JPG GND on the indoor Replace the indoor fan motor p mme pid electronic control P C board fall to Replace the indoor electronic t de des Ch t s QOL Yes 2 V or less within
23. of the indoor unit that operates first is selected Other indoor units cannot operate and operation indicator lamp flashes as shown in the figure below In this case please set all the indoor units to the same operation mode Operation indicator lamp AK Lighted Blinking O Not lighted When indoor unit starts the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 minutes to blow out the warm air In the heating operation though indoor unit that does not operate may get warm or the sound of refrigerant flow ing may be heard they are not malfunction The reason is that the refrigerant continuously flows into it 8 7 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button AUTOQ 1 2w 3 944 5 SWING 3 Positioning To confirm the standard position the vane moves until it touches the vane stopper Then the vane is set to the selected 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 operation starts c When standby mode
24. pressed once again 5 WIDE MODE zx By selecting WIDE mode with WIDE VANE button indoor fan speed becomes faster than setting fan speed on the remote controller x The remote controller displays Z NOTE x Indoor fan speed becomes faster than setting fan speed on the remote controller even when x or is selected OBH548D 8 8 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 O 00 AM blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK SET button How to set the current time a Press the CLOCK set button b Press the TIME SET buttons and lt to set the current time Each time FORWARD button gt is pressed the set time increases by 1 minute and each time BACK WARD 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 59 during operation b Set the time of the timer using TIME SET buttons gt and lt OFF timer setting a Press OFF TIMER button pee during operation b Set the time of t
25. switch A 15 Min circuit ampacity A 1 0 Fan motor F L A 0 76 Airflow COOL Dry CEM 399 321 237 170 145 Super High High Med Wet 364 286 201 134 109 Low Quiet HEAT Dry CFM 406 321 233 170 145 406 321 237 170 145 Moisture removal pt h 1 5 2 5 Sound level Cooling dB A 45 37 30 22 19 Super High High Med 7 43 37 30 22 19 Low Quiet Heating 43 37 30 22 19 Cond drain connection O D 5 8 31 7 16 Dimensions in 9 1 8 11 5 8 Weight 22 External finish Munsell 1 0Y 9 2 0 2 Control voltage by built in transformer 12 24 VDC MSZ GE15NA MSZ GE18NA MSZ GE24NA Indoor model MSY GE15NA MSY GE18NA MSY GE24NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch A 20 Min circuit ampacity A 1 0 Fan motor F L A 0 76 Airflow COOL Dry CFM 533 420 335 272 205 533 420 339 275 230 738 628 469 388 Super High High Med Wet Low Quiet GE15 18 GE24 High Med Low HEAT Dry CFM 463 367 304 247 205 512 431 339 275 230 738 628 469 388 Moisture removal pt h 2 7 4 6 5 1 Sound level Cooling dB A 49 44 38 32 26 49 44 38 33 28 53 49 41 34 Super High High Med Low Quiet GE15 18 Powerful High Med Low Heating 46 40 35 30 26 49 43 38 33 28 52 49 41 32 GE24 Cond drain connection O D in 5 8 31 7 16 43 5 16 Dimensions in 9 1 8 9 3 8 11 5 8 12 13 16
26. terminal P C board 1 Remove the panel Refer to 1 and the corner box 2 Remove the screw of the V A clamp and the V A clamp 3 Remove the screw of the conduit cover and the con duit cover 4 Remove the screw of the conduit plate the conduit plate and the indoor outdoor connecting wire 5 Remove the screw of the electrical cover and then the electrical cover 6 Remove the ground wire connected to the indoor electronic control P C board from the electrical box Photo 3 7 Remove the power monitor receiver holder 8 Open the rear cover of the power monitor receiver holder and pull out the power monitor receiver SW board 9 Disconnect all the connectors on the indoor electronic control P C board and unhook all lead wires 10 Remove the screw of the terminal block on the indoor terminal P C board 11 Remove the indoor terminal P C board and the indoor electronic control P C board 3 Removing the indoor electrical box 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to 2 2 4 3 Remove the ground wire connected to the indoor heat exchanger from the electrical box 4 Remove the screw of the electrical cover and remove the electrical cover 5 Disconnect all the connectors on the indoor electronic control P C board and unhook all lead wires 6 Remove the screw fixing the electrical box then the upper catch of the
27. 12 seconds after No control P C board LLLA MEASURE 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 CN10A Measure the voltage between CN211 4 and JPG GND on the indoor Is it unchanged holding Y and while the fan motor is rotating 0 or 15 VDC No electronic control P C board when j Yes Changed the fan motor is rotaring Unchanged Replace the indoor fan motor Y Replace the indoor power P C ls i h d holdi Replace the indoor board and the indoor terminal P C lt s it unchanged holding electronic control P C board Yes Oor 15 VDC No board Unchanged Changed OBH548D a 52 24 MSY GE24NA 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 Turn ON the power supply wait 5 seconds or more and then press EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER 1 GENCY OPERATION switch is pressed Is there any foreign matter that interferes If han 12 d OFF th F the rotation of the line flow fan No more t 12 seconds passes turn C the power supply and turn it ON again then measure the voltage X
28. 6 Remove the vertical vane motor from the vertical vane motor unit 7 Disconnect the connector of vertical vane motor from the vertical vane motor Screws of the vertical vane motor unit cover Photo 6 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 Disconnect the connector from the horizontal vane motor 4 Remove the screws of the horizontal vane motor unit cover 5 Remove the horizontal vane motor from the horizontal o vane motor unit le Screws of the horizontal vane motor unit cover Screws of the horizontal vane motor unit OBH548D T OPERATING PROCEDURE PHOTOS 7 Removing the water cut the indoor fan motor the indoor coil thermistor and the line flow fan 1 Remove the panel Refer to 1 and the corner box 2 Remove the power monitor receiver holder the electri cal box and the nozzle assembly Refer to 3 and 4 3 Remove the screw of the water cut and remove the water cut 4 Remove the screws fixing the motor bed 5 Loosen the screw fixing the line flow fan 6 Remove the motor bed together with fan motor and motor band 7 Remove the screw of the motor band 8 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 9 Remove the indoor coil thermistor from the heat exchanger
29. APAN Copyright 2009 MITSUBISHI ELECTRIC CO LTD Distributed in Oct 2014 No OBH548 REVISED EDITION D Distributed in Jul 2011 No OBH548 REVISED EDITION C Distributed in Apr 2011 No OBH548 REVISED EDITION B Distributed in Sep 2010 No OBH548 REVISED EDITION A 5 Distributed in Jul 2009 No OBH548 5 New publication effective Oct 2014 Made in Japan Specifications subject to change without notice
30. 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 at 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 5 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 the COOL mode 8 1 1 2 Low outside temperature operation Low outside temperature operation works the same way as that in the COOL mode 8 1 2 OBH548D m 8 3 HEAT i OPERATION MSZ 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 TOO WARM or TOO COOL 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
31. MITSUBISHI ELECTRIC INDOOR UNIT SPLIT TYPE AIR CONDITIONERS SERVICE MANUAL Models MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA Changes for the Better Revision D e MSZ GE06 09 12 15 18NA 9 and MSY GE09 12 15 18NA 9 have been added Please void OBH548 REVISED EDITION C No OBH548 REVISED EDITION D MSZ GEO06NA MSZ GEO9NA i MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GEO9NA MSY GE12NA MSY GET5NA utdoor unit service manua MSY GE18NA MUZ GE NA MUY GE NA Series OBH549 MXZ B NA Series OB444 CONTENTS 1 TECHNICAL CHANGES n 2 2 PART NAMES AND FUNCTIONS 3 nn eaa i 5 4 OUTLINES AND DIMENSIONS 7 5 WIRING DIAGRAN nnnc 9 6 REFRIGERANT SYSTEM DIAGRAM 11 7 SERVICE FUNCTIONS 12 8 MICROPROCESSOR CONTROL 14 9 21 10 DISASSEMBLY INSTRUCTIONS 40 RoHS compliant products have G mark on the spec name plate PARTS CATALOG
32. ND GND Vane motor CN151 Connector to Indoor power board CN10A 12 VDC 5 VDC To disable Auto restart function solder the Jumper wire to JRO7 Refer to 7 3 35 Resistance kQ Indoor fan motor CN211 Q 294 325 VDC GND high voltage DC 15 VDC 3 6 VDC 0 6 V Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 32 50 68 86 104122 140 Temperature F oo MSZ GE06 09 12 15 18NA i 1 MSY GE09 12 15 18NA Indoor electronic control P C board Timer short mode point JPG JPS Refer to 7 1 Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 Lo GND RI o M Vane motor CN151 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 40 o CNIS1 041 l i l DM76Y529S Gi Connector to 30 ae ad lt Indoor power P C board e I 1 8 CN10A i 3 g ed m k 20 Va O om ain 12 b o 2 CNI27 JR07 c m nu 5 VDC 1 Emergency operation E disable Auto restart function switch E O SW SW1 solder the Jumper wire to JRO7 Beers 32 50 68 86 104122 140 Temperature F 36 OBH548D 52 06 09 12 15 18 1 MSY GE09 12 15 18NA Indoor power board Indoor terminal board koj I
33. ON OPERATION Switch is pressed operation X HEAT mode Switch is pressed Switch is pressed If blinking of OPERATION INDI CATOR lamp cannot be checked it can be checked with failure mode recall function 1 Check indoor out door connecting wire Check if the power is supplied to the indoor unit Refer to Check of R V coil Check room temperature thermistor Refer to 9 6 B Check of remote controller and indoor elec tronic control P C Refer to How to check inverter com pressor Refer to 9 7 Test point diagram and voltage board Refer to 9 6 Check of indoor P C board and indoor fan motor Upper lamp Upper lamp Upper lamp Upperlamp Upperlamp Upper lamp Flash ON 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 7 time flash 14 time flash and OFF at Cause Cause Cause Cause Cause Cause Cause 0 5 second Indoor unit Indoor unit Indoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit intervals Trouble Trouble of Trouble Outdoor Trouble of Trouble of Other ab Cause of room indoor fan of indoor power sys thermistor in outdoor con normality Indoor Outdoor temperature motor unit control tem abnor outdoor unit trol system uni
34. OWERFUL button gt J gt FAN SPEED CONTROL button TIME SET buttons FORWARD button PowERFUL TIME RESET button Indication of remote controller model is on back OFF TIMER button BACKWARD button J RESET CLOCK EI Q ON TIMER button CLOCK SET button 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 OBH548D 14 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 Lighted 325 Blinking O Not lighted About 4 F 2 C or more away from set tempera ture The unit is operating to reach the set temperature The room temperature is About 2 to 4 F 1 to 2 C approaching the set tem perature from set temperature Standby mode Only during multi system operation 8 1 COOL z 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 TOO WARM or TOO COOL button to select the desired temperature The setting range is 61 88
35. RATION SELECT button and TOO COOL 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 Confirm that the indicators on the LCD screen shown in the right figure are all displayed Then release the buttons v MITSUBISHI ELECTRIC ade MITSUBISHI ELECTRIC Press OPERATE STOP ON OFF button of the remote controller the set temperature isi K displayed with the remote controller headed towards the indoor unit 1 Y E g MSZ type Does upper lamp of OPERATION INDICATOR meri lamp on the indoor unit blink at the interval of 0 5 Indoor unit is normal seconds 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 OFF Check if outdoor unit is abnormal according to the detailed outdoor unit INDICATOR lamp Rd of OPERATION failure mode recall function Yes X1 Regardless of normal or abnormal condition Judgment of indoor outdoor abnormality y Blinks a short beep is emitted once the signal is re Before blinking does upper lamp of ceived 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 The outdoor unit is abnormal Check the blinking
36. Remove the indoor power P C board and the indoor terminal P C board OBH548D 41 Photo 2 Electrical box Ground wire Screw of the electrical cover Screw of the V A clamp Indoor electronic control P C board holder Catch of indoor electronic control P C board holder Photo Indoor terminal P C board Upper catch P C board Lower catch ss Screws of the Terminal block conduit plate Catch of indoor electronic Screw of the control P C board holder conduit cover Photo 4 Mee Screw of the electrical box OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly Photo 5 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to 2 2 7 3 Remove the indoor electronic control P C board hold er 4 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 5 2 Remove the screws of the horizontal vane motor unit 3 Disconnect the connector from the horizontal vane motor 4 Remove the screws of the horizontal vane motor 5 Remove the horizontal vane motor from the horizontal vane motor unit Screws of horizontal vane motor unit OBH548D OPERATING PROCEDURE PHOTOS 6 Removing the indoor fan motor the indoor coil Photo 6 thermistor and the line flow fan 1 Remov
37. S Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping OBH548D i MSZ GE24NA MSY GE24NA Front panel Air filter Nano platinum filter Air cleaning filter Electrostatic anti allergy enzyme filter Air outlet Remote controller Operation indicator lamp 4 Mi Emergency operation switch SW Remote control receiving section ACCESSORIES Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping Air cleaning filter ee N N N OBH548D 3 3 SPECIFICATION MSZ GE09NA MSZ GE12NA Indoor model MSZ GE06NA MSY GE09NA MSY GE12NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect
38. SY GE18NA Is BURN E gel Ra 7777 8 PE Ty LD201 P CN211 F11 POWER SUPPLY a N TB T3 15AL250V T L sl eui 1 RED phase 60Hz T writ le le m lol FAN MOTOR iia i 4 leit ie E ent el C8 NRL VARISTOR SET YLW E Hu NN i 0 5 R111 RESISTOR BLK me ROOM TEMP INDOOR TERMINAL oR POWER CN20A Ted THERMISTOR IP C BOARD BOARD T7 RT12 COIL TEMP HR QU eee ho THERMISTOR MAIN fe eec Z pr COIL TEMP NOTES 1 About the outdoor side electronic wiring refer to the CN10A Outdoor unit electronic wiring diagram for servicing 5 Ti TRANSFORMER 2 i copper congr Hrs only CN151 A or field wiring Terminal block B TERMINAL BLOCK 3 Symbols indicate 0000 Connector CN105 X A disconnect should be CNL 12 required by local code INDOOR ELECTRONIC CONTROL P C BOARD MSZ GE24NA MSY GE24NA FROM OUTDOOR UNIT ELTE Pegi POWER 1 1 phase amp 0Hz Wes EH h OC12 24V TO OUTDOOR UNIT MEMOS INDOOR TERMINAL S ee p 010400 NOTES 1 About the outdoor side electric wiring 9 refer to the outdoor unit electric wiring diagram for servicing I 2 Use copper conductors only For field wiring 3 Symbols indicate IT Terminal block T 5 looog Connector L X A disconnect should be requir
39. art one by one OBH548D 8 MICROPROCESSOR CONTROL MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA WIRELESS REMOTE CONTROLLER E g MSZ type MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA Signal transmitting section Operation display section OPERATE STOP ON OFF button ON OFF 0499 ON OFF Wau DESL FAN SPEED CONTROL button OPERATION SELECT button Temperature buttons MSZ GE24NA MSY GE24NA Signal transmitting section Operation display section OPERATE STOP ON OFF button Temperature buttons TOO ri TOO wARMUD COOL ECONO COOL button VANE CONTROL button SMART SET button RESET button Indication of remote controller model is on back VANE CONTROL button Rorizontal vane button OPERATION SELECT button ECONO COOL VANE START ON OFF VIRDEE OFF TIMER button ON TIMER button TIME SET buttons FORWARD button BACKWARD button CLOCK SET button jJ 2 ECONO COOL button WIDE VANE button Vertical vane button P
40. between X2 Connect of the tester to fan motor connector s lead CN211 O and of the indoor wire and to lead wire otherwise the resistance cannot be fan motor connector 1 2 measured properly X3 Please replace the fuse after removing the indoor terminal P C board from the electrical box Is the resistance 1 Replace the fuse F11 and the indoor fan motor x3 or more Replace the fuse F11 x3 Measure the resistance of cement Is the resistance No Replace the indoor electronic control P C board resistor R111 on the indoor electronic approximately 40 and the indoor fan motor control P C board Yes Indoor terminal Indoor electronic Replace the indoor electronic control P C board P C board control P C Board Fuse F11 R111 NE CN211 OBH548D i D How to check miswiring and serial signal error MSZ GE06 09 12 15 18NA MSY GE09 12 15 18NA Turn OFF the power supply Y Is there rated voltage in the power supply y Yes Turn ON the power supply y Yes No Check the power supply Is there rated voltage between outdoor terminal block S1 and S2 No Check the wiring Y Press EMERGENCY OPERATION switch once Does the OPERATION INDICATOR lamp light up lt Confirmation of the power to the indoor unit gt Y Yes serial signal error
41. coil thermistor CN151 Vane motor CN10A To the indoor power P C board 7 Unhook the catches of the indoor electronic control P C board holder from the nozzle and the electrical box right side 8 Remove the indoor electronic control P C board hold er from the conduit cover 9 Remove the room temperature thermistor from the hook of the indoor electronic control P C board hold er 10 Open the back side of the indoor electronic control P C board holder and remove the indoor electronic con trol P C board 11 Remove the room temperature thermistor from the indoor electronic control P C board Removing the indoor power P C board the indoor terminal P C board and the electrical box 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire and the indoor electric control P C board holder Refer to 2 2 8 3 Remove the screw of the conduit cover and the con duit cover 4 Remove the screw of the conduit plate and the con duit plate 5 Remove the ground wire connected to the indoor heat exchanger from the electrical box 6 Remove the screw fixing the electrical box 7 Unhook first the lower then the upper catches of the electrical box and pull out the electrical box 8 Disconnect all the connectors on the indoor power board and unhook all lead wires 9 Remove the screw of terminal block on the indoor ter minal P C board 10
42. d connection 23 8 GE06 09 12NA 21 2 GE15 18NA 2 3 16 1 15 16 Drain hose Insulation 1 1 8 O D Connected part 25 8 O D 52 0 06 MSZ GE09NA s MSZ GE12NA 5 MSZ GE15NA 5 MSZ GE18NA s 9 MSY GE12NA gt 9 MSY GE15NA MSY GE18NA 9 1 16x13 16 Oblong hole L3 1 8 lt rA 31 1 16 30 15 16 J 3 8 1116 1 Oblong hole Installation plate 3 1 8 ME 618 81 8 4 gt TN A x JN L i g 9 1 8 9 15 16 J 8 5 16 1 15 16 OBH548D e 2 ERN 3 ES 2 3 13 5 16 13 9 16 gt 2 118 Air in m hole 2 9 16 Installation plate Insulation 01 3 8 O D 2 Liquid line 21 4 19 11 16 Flared connection 21 4 amp Gas line 23 8 16 15 16 Flared connection 23 8 GE06 09 12NA 21 2 GE15 18NA Drain hose Insulation 21 1 8 O D Connected part 25 8 O D MSZ GE24NA MSY GE24NA 2732 42 718 7 16 1 Oblong hole Installation plate 5 116 8 7 8 8 7 8 7 16x3 4 Oblong hole 43 5 16 pure 3 16 a 11 116 TELLE L I IT 2 Lx E
43. e TOO TOO COOL WARM To raise the set temperature 2 4 F 1 2 C To lower the set temperature 2 4 F 1 2 C OBH548D 8 6 AUTO CHANGE OVER AUTO MODE OPERATION MSZ 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 f 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 temperature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 F 1 C above the set temperature NOTE1 If two or more indoor units are operating multi system there might be a case that the indoor unit which is operating in i AUTO cannot change over to the other operating mode COOL HEAT MSZ and becomes a state of standby Refer to NOTE2 FOR MULTI SYSTEM AIR CONDITIONER NOTE2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the others for heating the operation mode
44. e the panel Refer to 1 and the corner box 2 Remove the indoor electronic control P C board hold er the electrical box and the nozzle assembly 3 Remove the screws fixing the motor bed 4 Loosen the screw fixing the line flow fan 5 Remove the motor bed together with fan motor and motor band 6 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger X Install the indoor coil thermistor in its former position when assembling it Refer to Photo 9 9 Remove the screws fixing the left side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan to the lower left Screw of the line flow fan Photo 7 Motor band Indoor coil thermistor sub RT13 1 Screws of the motor bed Indoor coil thermistor main RT12 Photo 8 Screws of the left side of the heat exchanger OBH548D sis 10 2 MSZ GE24NA MSY GE24NA OPERATING PROCEDURE NOTE Turn OFF the power supply before disassembly PHOTOS 1 Removing the panel 1 Remove the horizontal vanes 2 Remove the screw caps of the panel Remove the screws of the panel 3 Hold the lower part of both ends of the panel and pull it slightly toward you and then remove the panel by pushing it upward 2 Removing the indoor electronic control P C board the power monitor receiver SW P C board and the indoor
45. ed by local code OBH548D INDOOR ELECTRONIC R111 CONTROL P BOARD C 10 SYMBOL NAME FUSE T3 15AL250V FAN MOTOR VANE MOTOR HORIZONTAL VANE MOTOR VERTICAL NR11 VARISTOR R111 RESISTOR ROOM TEMP THERMISTOR COIL TEMP THERMISTOR MAIN COIL TEMP THERMISTOR SUB TRANSFORMER TERMINAL BLOCK 6 REFRIGERANT SYSTEM DIAGRAM MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA Unit inch MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA Refrigerant pipe 23 8 MSZ GE06 09 12NA MSY GE09 12NA 21 2 MSZ GE15 18NA MSY GE15 18NA with heat insulator Flared connection Indoor coil thermistor 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 GE24NA MSY GE24NA Refrigerant pipe 25 8 with heat insulator Flared connection Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Room temperature thermistor RT11 Flared connection Refrigerant pipe 23 8 with heat insulator Refrigerant flow in cooling gt Refrigerant flo
46. een modified to be compatible with Honeywell remote controller 2 Indoor electronic control P C board has been changed MSZ GEO6NA gt MSZ GEO06NA MSZ GEO09NA gt MSZ GEO09NA m MSZ GE12NA gt MSZ GE12NA MSZ GE15NA gt MSZ GE15NA MSZ GE18NA gt MSZ GE18NA i MSY GEO09NA s gt MSY GEO9NA m MSY GE12NA 1 gt MSY GE12NA MSY GE15NA s gt MSY GE15NA MSY GE18NA gt MSY GE18NA P 1 Model name has been changed 2 New service parts numbers Refer to OBB548 1 9 to 1 12 OBH548D 2 PART NAMES AND FUNCTIONS MSZ GEO6NA MSZ GE09NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA Air filter Catechin air filter GE NA Nano platinum filter GE NA Front panel Air cleaning filter Anti Allergy Enzyme Filter lint 2 Gus 1 E E d Remote controller ES Horizontal vane Display section Remote control receiving section Operation indicator lamp L Emergency operation switch E O SW ACCESSORIE
47. el 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 CONTROL or POWERFUL MSZ MSY GE24NA button 10 POWERFUL amp operation MSZ GE24NA MSY GE24NA The air conditioner automatically adjusts the fan speed and the set temperature and operates the POWERFUL mode The POWERFUL mode is automatically released 15 minutes after operation starts and the operation mode returns to the mode prior to POWERFUL operation To manually cancel this operation select a different mode or press POWERFUL or ECONO COOL button 2 Vertical vane MSZ GE24NA MSY GE24NA 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 button 1443 2 R 3 4 ee 3 Positioning a When OPERATE STOP ON OFF button is pressed POWER ON b When SWING is started c When the power supply turns ON 4 SWING MODE By selecting SWING mode with WIDE VANE button the vertical vane swings horizontally The remote controller displays Swing mode is cancelled when WIDE MODE button is
48. electrical box and pull out the electrical box 44 OBH548D Photo 1 Horizontal vanes Front panel Screws of the panel Photo 2 Screw of the V A clamp BS Power monitor receiver holder Photo 3 Upper catch yu Indoor electri Screw of the terminal block electrical box Screw of the conduit cover Screw of the conduit plate Ground wires OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly 1 Remove the panel Refer to 1 and the corner box 2 Remove the V A clamp and then the indoor outdoor connecting wire Refer to 2 2 4 3 Remove the electrical cover Photo 2 4 Disconnect the following connectors on the electronic control P C board CN151 Horizontal vane motor CN152 Vertical vane motor 5 Remove the power monitor receiver holder Photo 2 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to 5 and 6 Screw of the vertical vane motor unit Photo 5 5 Removing the vertical vane motor unit 1 Remove the nozzle assembly Refer to 4 2 Remove the crank of the vertical vane motor unit from the arm of the vertical vane 3 Remove the screw of the vertical vane motor unit and pull the vertical vane motor unit 4 Remove the screws of the vertical vane motor unit cover 5 Remove the crank of the vertical vane motor unit from the shaft of the vane motor
49. er J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press the RESET button Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J1 Same as at left Same as at left No 3 unit Solder J2 Same as at left No 4 unit Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set The setting will be cancelled if the breaker has turned OFF or the power supply has shut down Please conduct the above setting once again after the power has been restored OBH548D 7 3 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation 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 shut off of the main power Operation If the main power has been cut the operation settings remain After the power is restored the unit resta
50. gnal 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 OBH548D 23 9 3 INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates Outdoor unit does not operate normally Indoor unit does not receive the signal from re mote controller OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF Indoor unit oper ates Outdoor unit does not operate r 2 rss ME Outdoor unit Outdoor unit Unit does Indoor unit Indoor unit does Test Run operation means the operates only does not operate nor operates when not operate when operation within 30 minutes af in Test Run operate even mal operation EMERGENCY EMERGENCY ter EMERGENCY OPERATION operation in Test Run in COOL or OPERATI
51. h OPERATION SELECT button 3 The operation mode is determined by the room temperature at start up of the operation Once the mode is fixed the mode does not change by room temperature afterwards Under the ON TIMER operation mode is determined according to the room temperature at the start up of operation 4 The initial set temperature is decided by the initial room temperature Initial room temperature Initial set temperature 79 F 26 or more 75 24 COOL mode of FEEL CONTROL 7T to 79 F 25 to 26 C Initial room temperature minus 4 F 2 C Less than 79 F 25 C P Initial room temperature minus 4 F 2 5 TEMPERATURE buttons In I FEEL CONTROL lt mode set temperature is decided by the microprocessor based on the room temperature In addition set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm Each time the TOO WARM or TOO COOL button is pressed the indoor unit receives the signal and emits a beep tone Fuzzy control When the TOO COOL or TOO WARM button is pressed the microprocessor changes the set temperature consider ing the room temperature the frequency of pressing TOO COOL or TOO WARM button and the user s preference to heat or cool So this is called Fuzzy control and works only in FEEL CONTROL mode In DRY mode of FEEL CONTROL the set temperature does not chang
52. he timer using TIME SET buttons gt and lt J x x Each time FORWARD button 3 is pressed the set time increases by 10 minutes each time BACKWARD button is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button 57 STOP To release OFF timer press OFF TIMER button 5 6 TIMER is cancelled and the display of set time disappears PROGRAM TIMER OFF timer and ON timer can be used in combination The set time that is reached first will operate first 1 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 The unit turns ON at 5 00 PM and OFF at 9 00 AM PM Current Current ON ON p ON OFF 9 0 PM OFF OFF PM o ded at LILI Ceri dd D ng OU NOTE If the main power is turned OFF or a power failure occurs while ON OFF timer is active the timer setting is can celled As these models are equipped with an auto restart function the air conditioner starts operating with timer cancelled when power is restored 19 OBH548D 8 9 SMART SET OPERATION MSZ GE06 09 12 15 18NA MSY 09 12 15 18NA 1 How to SET SMART SET operation
53. ing 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 C Hold the sleeve and Pull the terminal while pull out the terminal pushing the locking slowly lever Connector 10 1 MSZ GEO6NA MSZ GE09NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA NOTE Turn OFF the power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panel Photo 1 1 Remove the horizontal vanes 2 Remove the screw caps of the panel Remove the screws of the panel Horizontal vanes Front panel 3 Unhook the lower part of the panel 4 Hold the lower part of both ends of the panel and pull it slightly toward you and then remove the panel by pushing it upward Screws of the panel OBH548D OPERATING PROCEDURE PHOTOS 2 Removing the indoor electronic control P C board and the room temperature thermistor 1 Remove the panel Refer to 1 and the corner box 2 Remove the screw of the V A clamp and the V A clamp 3 Loosen the screw of the indoor outdoor connecting wire and remove the indoor outdoor connecting wire 4 Remove the screw of the electrical cover and the electrical cover 5 Open the indoor electronic control P C board holder to right side 6 Disconnect the following connectors lt Indoor electronic control P C board gt CN112 Indoor
54. ires discon Yes disconnection Indoor terminal P C board ndoor power P C board nected us ee s or lt R111 Fuse KR Replace the indoor electronic control P C board F11 Varistor NR11 CN211 30 OBH548D MSZ GE24NA MSY GE24NA Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply gt Measure the resistance between CN211 Short circu and of the indoor fan motor connector Replace the indoor fan motor Y Yes Does the unit operate with the remote controller Measure the resistance of the horizontal vane Short circuit Does OPERATION INDICATOR lamp light up by motor coil Replace the horizontal vane motor and the indoor pressing EMERGENCY OPERATION switch Refer to 9 5 electronic control P C board No Replace the varistor NR11 and fuse F11 i Yes Are the varistor NR11 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 electronic control P C and the varistor in any case board visually Is the fuse F11 blown only X1 The fan motor connector s lead wire is red whereas is black Measure the resistance
55. k S1 and S2 Confirmation of power voltage Yes Is there amplitude of 10 to 20 VDC between indoor terminal block S2 Replace the inverter P C board or the outdoor No electronic control P C board 2 Lighted z or not X2 Be careful of the residual voltage of smoothing lighted capacitor Check the wiring If there are any error 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 and S3 Confirmation of serial signal No Yes Y ET Is there 2 VDC or less between 10 Turn OFF inverter controlled lighting and JPG GND on the indoor electronic equipment control P C board Turn OFF the power supply and then turn ON again Yes ys Press EMERGENCY OPERATION Switch board Reinstall Is there 2 VDC or less between CN10A and JPG GND o the indoor electronic control P C Is there 2 VDC or less between CN10A and JPG GND on the indoor electronic control P C board Yes either the unit or the light away from each other Attach a filter on remote Replace the indoor power P C board and the indoor terminal P C board Is serial error ind minutes signal icated 6 later Replace the indoor elec tronic control P C board
56. mes after 3 minutes Except for outdoor unit of multi system type Is the bus bar voltage of the inverter P C board or the outdoor electronic control P C board normal Refer to TEST POINT DIAGRAM AND VOLTAGE in the outdoor service manual No Yes Y Does the LED on the inverter P C board or the outdoor electronic control P C Replace the inverter P C board or the outdoor board repeat 3 6 second OFF and 0 8 second ON quick blinking 3x3 No electronic control P C board Lighted Yes oat X2 Be careful of the residual voltage of smoothing Y lighted capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit OBH548D 33 Replace the indoor electronic control P C board Elect romagnetic noise enters into TV sets or radios t the distance between the TV sets or Extend the distance between the TV sets and or Is the unit grounded Ground the unit No Yes Is the distance between the
57. minal block Connector X A disconnect should be required by local code MSZ GEO06NA MSZ GE09NA s MSZ GE12NA s MSZ GE15NA s MSZ GE18NA s 9 MSY GE12NA 3 15 MSY GE18NA s NAME et a Sean POE SUPPLY m 1 RED 3 15AL250V I F p a FAN MOTOR ied x le TO OUTDOOR EU 4 3 VANE MOTOR MEC CL HORIZONTAL 0C12 24V NR11 VARISTOR R111 RESISTOR TO OUTDOOR UNIT BEER ma WEM P C BOARD ano TEMP a sS sss THERMISTOR MAIN COIL TEMP RT13 THERMISTOR SUB NOTES TRANSFORMER 1 About the outdoor side electric wiring refer to the outdoor unit electric wiring TERMINAL BLOCK diagram for servicing I Use copper conductors only For field wiring si 3 Symbols indicate OLO Terminal block Connector ZRT aI CONTROL P C BOARD X A disconnect should be required by local code OBH548D d 52 0 06 MSZ GEO9NA s MSZ GE12NA s MSZ GE15NA s MSZ GE18NA Is 9 5 MSY GE12NA m MSY GE15NA 9 M
58. mode Refer to outdoor unit service of the indoor unit that has operated at first has manual the priority mode 2 5 second OFF indoor unit does setting not operate 9 5 TROUBLE CRITERION OF MAIN PARTS MSZ GEO6NA MSZ GE09NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA Part name Check method and criterion Room temperature Measure the resistance with a tester thermistor RT11 Indoor coil thermistor Refer to 9 7 Test point diagram and voltage 2 or 3 Indoor electronic RT12 RT13 control P C board for the chart of thermistor Indoor fan motor MF Check 9 6 Measure the resistance between the terminals with a tester MSZ GE06 09 12 15 18NA Temperature 50 86 F 10 30 C MSY GE09 12 15 18NA rm Vane motor MV olor the lead wire orma RED BLK 223 268 Q Measure the resistance between the terminals with a tester MSZ GE24NA o _ MSY GE24NA Part temperature 50 86 F 10 30 C Horizontal vane motor MV1 Color of the lead wire Normal Vertical vane motor Horizontal vane motor MV1 RED BLK 313 375 O BLK BLK MV2 Vertical vane motor MV2 268 322 Q OBH548D zi 9 6 TROUBLESHOOTING FLOW A Check of indoor fan motor MSZ GE06 09 12 15 18NA MSY GE09 12 15 18NA The indoor fan motor error has occurred and the indoor fan does
59. mote 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 f Insert the negative pole of the batteries first Check if the polarity ofthe 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 OBH548D 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 MSZ GE06 09 12 15 18NA MSZ GE24NA MSY GE09 12 15 18NA MSY GE24NA Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Turn ON the power supply lt Preparation of the remote controller gt While pressing both OPE
60. ndoor terminal P C board Indoor power P C board Fuse 11 Varistor NR11 Resistor R111 Indoor fan motor CN211 0 6 V 3 6 VDC 15 VDC GND high voltage DC 294 325 VDC Terminal block Connector to indoor electronic control P C board CN20A Please replace the fuse after removing the indoor terminal board from the electrical box MSZ GEO06 09 12 15 18NA MSY GE09 12 15 18NA Indoor electronic control P C board ko Timer short mode point JPG JPS Refer to 7 1 Room temperature thermistor RT11 CN111 meum ilic mp h Short OR oc Indoor coil thermistor RT12 RT13 CN112 GND Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Vane motor CN151 40 e I A E E i SM76A270 Connector to 30 Indoor power P C board CN10A looo LAAT Au Pound BOMBA ROE BUEN CNIOA e Joints Resistance kQ 20 V 1 12 VDC z in Emergency operation To disable Auto restart function switch E O SW SW1 solder the Jumper wire to JR07 Refer to 7 3 0 32 50 68 86 104122 140 Temperature F OBH548D i MSZ GE24NA 3 Indoor terminal P C board Indoor electronic control P C board Power monitor receiver SW P C board Indoor electronic cont
61. omagnetic noise Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiv er 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 the 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 OBH548D 9 7 Test point diagram and voltage MSZ GE06 09 12 15 18NA NA MSY GE09 12 15 18NA NA 1 Indoor power board Indoor terminal board Indoor terminal P C board Fuse F11 3 Varistor NR11 DM76Y559G01 c C Toy Terminal block THa A0SZ TvSI EL nZ LZ iOar Indoor power
62. operating or is starting and the temperature of indoor heat exchanger and or the 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 8 4 OPERATION MSY 1 Press OPERATE STOP ON OFF button 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 5 I FEEL CONTROL OPERATION MSY 1 Press OPERATE STOP ON OFF button on the remote controller OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone 2 Select FEEL CONTROL mode wit
63. 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 Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall 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
64. r 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 properly 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 s Check the stop valve Confirm the abnormality in de tail using the failure mode recall function for outdoor unit Outdoor control sys tem OBH548D x Upper lamp lights up 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 25 Check the blinking pattern of the LED on the inverter P C board or the outdoor electronic control P C board OPERATION INDICATOR 5 Abnormal point Operation indicator lamp Symptom Condition Upper lamp lights and lower lamp flashes MXZ type Outdoor unit The operation mode of the each indoor unit A is differently set to COOL includes DRY and Unify the operation mode Operation AN i operates but HEAT at the same time the operation
65. rol P C board Indoor terminal P C board Indoor coil thermistor Fuse Terminal F11 block Varistor NR11 RT12 RT13 CN112 Power monitor receiver SW P C board CN20A 9 Refer to 9 6 VOZNO DMOON335 s Joints Emergency operation switch E O SW SW1 oe Bi DMO0N645 618 P ER d d Room temperature thermistor RT11 j an Ale 2 DE OC o S9 L 52 Si E 2 Vane motor le 2 12 VDC To disable Auto restart function solder the Jumper wire to JRO7 Refer to 7 3 Resistor R111 P9 VN CIBISRIAT omo On MN Timer short mode point JPG JPS Refer to 7 1 Indoor fan motor CN211 325 VDC GND high voltage 15 VDC 3 6 VDC 0 or 15 VDC Please replace the fuse after removing the indoor terminal board from the electrical box OBH548D 38 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Resistance kQ 40 a 32 50 68 86 104122 140 Temperature F MSY GE24NA Indoor terminal P C board Indoor electronic control P C board Power monitor receiver SW P C board Indoor terminal P C board Indoor electronic control P C board Indoor coil thermistor To
66. rts automatically according to the memory However it takes at least 3 minutes for the compressor to start running How to disable AUTO RESTART FUNCTION Turn OFF the main power of the unit Solder the Jumper wire JRO7 on the indoor electronic control P C board Refer to 9 7 MSZ GE06 09 12 15 18NA MSZ GE24NA MSY GE09 12 15 18NA MSY GE24NA Indoor electronic control P C board CN112 CN111 z 6 ex z 6 to z 6 Indoor electronic control P C board 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 a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled If 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 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 st
67. st run operation the system shifts to The operation mode is indicated by the Operation Indicator lamp as following EMERGENCY COOL HEAT MSZ MODE with a set temperature of MSZ MSY 75 F 24 C The fan speed shifts to Med EMERGENCY W lt EMERGENCY All protective operations such as the coil frost prevention works COLE 6 COOL even in the test or emergency operation In the test run or emergency operation the horizontal vane oper 1 1 ates in VANE AUTO mode EMERGENCY Emergency operation continues until EMERGENCY OPERATION HERR switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start Lighted sep Not lighted NOTE Do not press EMERGENCY OPERATION switch during normal operation 8 11 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute time delay function operates to protect compressor from overload 8 12 Changing temperature indication F C The preset unit is F F C Press RESET button while the temperature buttons are pressed C F Press RESET button or remove the batteries Press RESET button gently using a thin instrument OBH548D 9 TROUBLESHOOTING MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA
68. t indoor coil system mality Miswiring or thermistor trouble of serial signal Refer to 9 6 How to check mis wiring and serial signal error Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test point diagram and voltage OBH548D Refer to 9 6 Check of indoor fan motor Replace the indoor elec Refer to Check of outdoor ther mistors Replace the inverter P C board or the outdoor electronic control P C board Check Flow 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 OPERATION INDICATOR gt Abnormal point Lighted i Blinking O Not lighted Operation indicator lamp Symptom Condition Remedy Miswiring or serial signal Upper lamp flashes 0 5 second ON es goeosoeso 0 5 second OFF Indoor coil thermistor Room tem perature thermistor Upper lamp flashes 2 time flash Y eoeooooosSos oo 2 5 second OFF Indoor fan motor Upper lamp flashes 3 time flash w 2 5 second OFF Indoor con trol system
69. w in heating OBH548D 7 SERVICE FUNCTIONS MSZ GEO6NA MSZ GEO9NA MSZ GE12NA MSZ GE15NA MSZ GE18NA MSZ GE24NA MSY GEO9NA MSY GE12NA MSY GE15NA MSY GE18NA MSY GE24NA 7 1 TIMER SHORT MODE For service the set time can be shortened by bridging of JPG and JPS the indoor electronic control P C board The time will be shortened as follows Refer to 9 7 The set time for the ON OFF timer can be reduced to 1 second for each minutes After the breaker is turned on the time for starting the compressor which normally takes 3 minuets can be reduced to 3 seconds Restarting the compressor which takes 3 minuets cannot be reduced 7 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room In this case to operate each indoor unit individually by each remote controller P C boards of remote controller must be modified according to the number of the indoor unit How to modify the remote controller P C board Remove batteries before modification The board has a print as shown below ae Us Ta 2 NOTE For modification take out the batteries and ag B EE press the OPERATE STOP ON OFF button ip Qu twice or 3 times at first z n 4 After finish modification put back the batteries p then press the RESET button J1 J2 The board has the print J1 and J2 Sold

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