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SERVICE MANUAL MSZ-HE09NA MSZ-HE12NA

1. oe 9r DM76Y837G S33 o Room temperature m 4 94 9 Q 9 SU S thermistor RT11 ijo o o 3 i CN111 ROT TL uo 2 3 V 25 o E t o jo o aa 2 The Loe E 3 E PS T ls ZL S2 N 5172 m B FEES Eis SN O 09 2ly mek ve N V amp Vane motor si S a st be CN151 M EM oye T W SI IF Js Power monitor receiver SW P C board i 58 220 I S e alas 54 b 5 Blo o o z 87 S85 COMIS P TT Ota 22 H g eg
2. cies JPS ser f JPG Short ro FO Indoor coil thermistor RT12 RT13 CN112 GND C 2 JRO1 JRI9 N JR20 o 8 Vane motor CN151 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 ale 9 se fe ae s 4 Connector to 2 Ip Indoor power P C board 4 ofan oe 5 CN10A lt 4 00 835 ooooo 510 4 en o o AN 9 M7 12 VDC 5 OAO M Q 9 5 5 VDC x 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 30 OBH685 3 Indoor terminal board Indoor electronic control board Power monitor receiver SW board MSZ HE24NA Indoor terminal P C board Indoor electronic control P C board Indoor coil thermistor To disable Auto restart function Fuse Terminal Varistor RT12 RT13 11 block NR11 CN112 12 VDC solder the Jumper wire to JRO7 Refer to 7 3 Rit
3. 6 REFRIGERANT SYSTEM DIAGRAM MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA Unit inch Refrigerant pipe 23 8 MSZ HE09 12NA 01 2 MSZ HE15 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 HE24NA 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 flow in heating OBH685 7 SERVICE FUNCTIONS MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA 7 1 TIMER SHORT MODE For service the following set time can be shortened by bridging JPG and JPS on the indoor electronic control P C board Refer to 9 7 The set time for the ON OFF timer can be reduced to 1 second for each minute After the breaker is turned on the time for starting the compressor which normally takes 3 minutes can be reduced to 3 seconds Restarting the compressor which takes 3 minutes cannot be reduced 7 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 i
4. 9 TROUBLESHOOTING MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA 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 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 service 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
5. Air cleaning filter OBH685 3 SPECIFICATION Indoor model MSZ HE09NA MSZ HE12NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch A 15 Min circuit ampacity A 1 0 Fan motor F L A 0 76 COOL Dry Wet Airflow Super High High Med CFM 399 321 237 170 364 286 201 134 Low HEAT Dry CFM 406 321 237 170 Moisture removal pt h 1 5 2 5 Sound level Cooling dB A 43 37 30 22 45 37 30 22 Super High High Med Low Heating 43 37 30 22 Cond drain connection O D 5 8 W 31 7 16 Dimensions D 9 1 8 H 11 5 8 Weight 22 External finish Munsell 1 0Y 9 2 0 2 Control voltage by built in transformer Indoor model 12 24 VDC MSZ HE15NA MSZ HE18NA MSZ HE24NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch 20 Min circuit ampacity A 1 0 Fan motor F L A 0 76 COOL Dry Wet Airflow 533 420 335 272 498 385 300 237 533 420 339 275 498 385 304 240 629 544 470 388 562 486 420 347 Super High High Med Low HEAT Dry CFM 463 367 304 247 512 431 339 275 629 544 470 360 Moisture removal pt h 2 7 4 6 5 1 Sound level Super High High Med Low Cool
6. 2 5 second OFF Indoor coil thermistor Room tem perature thermistor Upper lamp flashes 3 time flash Indoor fan 46 080000080808000 motor 2 5 second OFF Upper lamp flashes 4 time flash Indoor go o 8080000080 80808 trol system 7 77 M TASTA IS 2 5 second OFF Indoor unit and outdoor unit do not operate Upper lamp flashes 5 time flash Outdoor power sys tem eosososoeocoooososo b TO Ct 2 5 second OFF Upper lamp flashes 6 time flash Outdoor RES MES NE NS m thermistors 08080 SosSosoooooso 2 5 second OFF Upper lamp flashes 7 time flash Outdoor ww ESA ww Acs control sys eoeoeoooooe tem L 2 5 second OFF Upper lamp flashes 14 time flash or more Other ab normality 2 5 second OFF 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
7. Remove the foreign matter and adulte rin a s 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 between CN211 Yes rise to the range of 2 to 6 VDC within Replace the indoor fan motor and 12 seconds after EMERGENCY OPERATION switch is pressed i Does the voltage between CN10A I and JPG GND on the indoor Replace the indoor power electronic control P C board fall to Replace the indoor electronic RE m 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 CN10A Measure the voltage between CN211 4 and JPG GND on the indoor Is it unchanged holding and while the fan motor is 2 un 0 or 15 VDC No electronic control P C board when 9 Changed i Yes 9 0 the fan motor is rotaring Unchanged Replace the indoor fan motor Y Replace the indoor power P C ls it h d holdi Replace the indoor board and the indoor terminal P C lt no electronic control board
8. 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 electrical box and pull out the electrical box 36 OBH685 Photo 1 Front panel Horizontal vanes Screws of the panel Photo 2 Electrical box Screw of the electrical cover N Screw of the V A clamp Ex Power monitor receiver holder Photo 3 Upper catch A Indoor electri electrical box A Screw of the Ground wires conduit cover Screw of the conduit plate 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 bo
9. 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 HEAT 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 TOO WARM or TOO COOL button to select the desired temperature The setting range is 61 88 F 16 31 1 Cold air prevention control When the compressor is not 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 te
10. 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 properly read data in the nonvolatile memory of the inverter P C board Replace the inverter 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 unit does not oper ate Outdoor control sys tem Upper lamp lights OBH685 It cannot properly read data in the nonvolatile memory of the inverter P C board 20 Check the blinking pattern of the LED on the inverter P C board 9 5 TROUBLE CRITERION OF MAIN PARTS MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA Part name Check method and criterion Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Measure the resistance with a tester Refer to 9 7 Test point diagram and voltage 2 or 3 Indoor electronic control P C bo
11. heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 7 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 5 Electrical box Screw of the electrical cover Screw of the V A clamp Power monitor receiver holder Screw of the water cut 38 OBH685 Photo 6 Screw of the line flow fan Indoor coil thermistor main RT12 Screw of the Screws of the motor bed Indoor coil thermistor sub RT13 Photo 8 Screws of the heat exchanger Fixing the indoor coil thermistor x 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 4 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 OBH685 m MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8
12. 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 OBH685 18 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 Indoor unit oper ates Outdoor unit does not operate OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF Outdoor unit Outdoor unit Unit does not Indoor unit Indoor unit does Test Run operation means the o
13. 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 restored OBH685 k 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 CD If the main power has been cut the operation settings remain 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 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 HE09 12 15 18NA MSZ HE24NA Indoor electronic control P C board CN112 CN111 6 eu 5 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 or a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled f the unit has been OFF with th
14. without beep Yes The outdoor unit is abnormal No Y Y mm The outdoor unit is abnormal The indoor unit is abnormal ege i Check the blinking pattern and identify the abnormal point by referring to the Check ihe blinking pattern and identify the abnormal point by referring to b Ec the indoor unit failure mode table Refer to outdoor unit service manual indoor unit failure mode table Refer to 9 2 2 Mak to checkat least tw tive blinki x3 Make sure to check at least two consecutive blinking cycles X2 sure to check at least two consecutive blinking cycles 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 After repairing the unit recall the failure mode again according to Se function mentioned above ing up the failure mode recall 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
15. 310 JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Feb 2014 No OBH685 New publication effective Feb 2014 Made in Japan Specifications are subject to change without notice
16. 32 7 27 32 el zl 4 3 8 115116 19 84 1546 1438 Airin m hole 3 1 2 Installation plate 11 2 5 OBH685 4 718 6 5 16 7 114 118 Drain hose Piping Insulation 02 O D Liquid line 03 8 19 11 16 Flared connection 23 8 Gas line 01 2 16 15 16 Flared connection 25 8 Drain hose Insulation 1 1 8 Connected part 25 8 5 WIRING DIAGRAM MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA Ux IB 10201 T LD201 P CN211 F11 POWER SUPPLY _ 4 Fil T3 15AL250V Ry 151 NE MF FAN MOTOR i 82 yen CONNECTING 1 M ow TRY 2 3 11 VARISTOR TO OUTDOOR UNIT MF CONNECTING WIRE RILI RESISTOR I e RTII ROOM TEMP INDOOR TERMINAL poon POWER CN20A Tn am THERMISTOR IP C BOARD BOARD T RT12 Min QUNM D UG m MAIN 10 a eet aris COIL TEMP NOTES 1 About the outdoor side elect
17. 4 33 5 MSZ HE15NA Dry 21 3 30 5 19 5 28 0 25 9 36 9 MSZ HE18NA 21 3 30 5 19 5 28 0 18 0 36 9 MSZ HE24NA 18 0 36 9 16 1 33 2 OBH685 4 OUTLINES AND DIMENSIONS MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA 31 7 16 30 15 16 7 16x1 Ob Unit inch 7 16x13 16 Oblong hole 3 1 8 MSZ HE24NA 2 9 16 Installation plate 13 5 16 6 1 8 6 1 8 13 9 16 Air in Installation plate Wall hole 22 9 16 Pipin i e 5 1 lt 1 5 8 2 vm x TM 4 3 16 Drain hose 4 3 8 Air out Insulation 01 3 8 O D 2 Liquid line 21 4 19 11 16 Flared connection 21 4 e a Gas line 23 8 16 15 16 Flared connection 23 8 HE09 12NA 21 2 HE15 18NA Drain hose Insulation 21 1 8 O D Connected part 25 8 O D 43 5 16 Indoor unit 7 16 3 4 Oblong hole 7 16x1 Oblong hole 8 7 8 1 878 pu gt ERN m _ 1 A 1 j MA m Bi i LM d ada s E M 232 E e m 1 1 a 9 oD D 121
18. Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL No OBH685 Models MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA Outdoor unit service manual MUZ HE NA Series OBH686 CONTENTS 1 TECHNICAL 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 5 4 OUTLINES AND DIMENSIONS 7 5 WIRING u u 8 6 REFRIGERANT SYSTEM DIAGRAM 9 7 SERVICE FUNCTIONS 10 8 MICROPROCESSOR CONTROL 12 im 9 TROUBLESHOOTING 16 MSZ HE12NA 10 DISASSEMBLY INSTRUCTIONS 32 MSZ HE15NA MSZ HE18NA PARTS CATALOG OBB685 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 malfunction unit breakdown or accidents caused by failure to follow the instructions 1 TECHNICAL CHANGES MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18
19. NA MSZ HE24NA 1 New model OBH685 2 PART NAMES AND FUNCTIONS MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA Air filter Air cleaning filter Anti Allergy Enzyme Filter optioin 2 m Front panel E EL Gara In pes Remote controller Horizontal vane Remote control receiving section Operation indicator lamp OBH685 i MSZ HE24NA Front panel Air cleaning filter Electrostatic anti allergy enzyme filter option ACCESSORIES Model Operation indicator lamp 2 Emergency operation switch Remote control receiving section E O SW MSZ HE09 12 15 18NA Remote controller MSZ HE24NA Installation plate 1 1 Attachment screws for the installation plate 4 25 mm Battery AAA for the remote controller Wireless remote controller Felt tape For left or left rear piping
20. 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 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 Horizontal vanes Front panel Screws of the panel OBH685 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 Remove the screw of the electrical cover and the electrical cover 4 Remove the screw of conduit cover and the conduit cover 5 Remove the screw of conduit plate the conduit plate and the indoor outdoor connecting wire 6 Open the indoor electronic control P C board holder to right side 7 Disconnect the following connectors lt Indoor electronic control P C board gt CN112 Indoor coil thermistor CN151 Vane motor CN10A To the indoor power P C board 8 Unhook the catches of the indoor electronic control P C board holder from the nozzle and the electrical box right side 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
21. Yes 0 or 5 VDC No board Unchanged Changed OBH685 ES MSZ HE24NA 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 GENCY OPERATION switch is pressed 7 If more than 12 seconds passes turn OFF the power supply and turn it ON again then measure the voltage Indoor electronic control P C board 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and Remove the foreign matter and X 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 VDC although the indoor P C board is normal Yes Does the voltage between CN211 UU m 2 O0 Nes of 3 to 6 VDC within 12 seconds after Replace the indoor fan motor EMERGENCY OPERATION switch is No pressed 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 Me
22. ard CN151 Horizontal 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 Photo 4 Screws of the horizontal vane motor unit cover Screws of the horizontal vane motor unit 5 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 vane motor unit OBH685 37 OPERATING PROCEDURE PHOTOS 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
23. ard for the chart of thermistor Indoor fan motor MF Check 9 6 MSZ HE09 12 15 18NA Vane motor MV Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire Normal RED BLK 223 268 Q MSZ HE24NA Horizontal vane motor MV OBH685 Measure the resistance between the terminals with a tester Part temperature 50 86 F 10 30 C Color of the lead wire Normal Horizontal vane motor MV RED BLK 313 3750 21 BLK BLK 9 6 TROUBLESHOOTING FLOW A Check of indoor fan motor MSZ HE09 12 15 18NA 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 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 211 and Indoor electronic control P C board 3 Measure the voltage between CN10A and JPG GND
24. asure the voltage between CN211 si h d holdi Replace the indoor and while the fan motor is s it unc electronic control P C tating 0 or 15 VDC No board Changed Yes Unchanged Replace the indoor fan motor OBH685 B Check of remote controller and indoor electronic control P C board Check if the remote controller is exclusive for this air conditioner MSZ HE09 12 15 18NA Press OPERATE STOP ON OFF button on the remote controller C 2 Is LCD display the remote controller visible ye 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 Does the unit operate with the remote controller Yes MSZ HE24NA Replace the batteries Refer to 9 1 4 No Not clear No gt Press OPERATE STOP ON OFF button on the remote controller 2 Y Is LCD display on the remote controller visible Yes 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 Y Does the unit operate with the remote controller Yes OBH685 Turn ON radio to and press OP ERATE STOP ON OFF button on the remote controller x1 Y Is noise heard from radio Yes Y Are there any fluorescent ligh
25. door wire and to lead wire otherwise the resistance cannot be fan motor connector 1 2 measured properly i X3 Please replace the fuse after removing the indoor terminal P C board from the electrical box Is the resistance 1MQ No or more Replace the fuse F11 and the indoor fan motor 3 Yes Replace the fuse F11 X3 Measure the resistance of cement resistor R111 on the indoor electronic control P C board Is the resistance approximately 40 Replace the indoor electronic control P C board and the indoor fan motor Yes Indoor terminal Indoor electronic Replace the indoor electronic control P C board P C board control P C Board R111 Varistor NR11 CN211 OBH685 D How to check miswiring and serial signal error MSZ HE09 12 15 18NA Turn OFF the power supply p Is there rated voltage in the power supply No Check the power supply y Yes Turn ON the power supply y Yes Is there rated voltage between outdoor terminal block S1 and S2 Ho Check the wiring Press EMERGENCY OPERATION switch once Does the OPERATION INDICATOR lamp light up lt Confirmation of the power to the indoor unit gt No T y Yes s there any miswiring poor es contact or wire disconnec C s serial signal error indicat
26. e 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 4 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 OBH685 OPERATING PROCEDURE PHOTOS 6 Removing 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 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 the fan motor and the motor band 6 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 7 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Refer to Photo 8 8 Remove the screws fixing the left side of the heat exchanger 9 Lift the heat exchanger and pull out the line flow fan to the lower left Indoor coil thermistor sub RT13 Indoor coil thermis
27. e pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button 0 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 buttons Y MITSUBISHI ELECTRIC 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 Y Does upper lamp of OPERATION INDICATOR x1 Regardless of normal or abnormal condition a short beep is emitted once the signal is received 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 is at the aming the OFF Check if outdoor unit is abnormal according to the detailed outdoor unit inking of upper lamp o i i INDICATOR lamp X2 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 Stays ON for 3 seconds
28. e 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 start one by one OBH685 8 MICROPROCESSOR CONTROL MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA WIRELESS REMOTE CONTROLLER Signal transmitting section ate MITSUBISHI ELECTRIC Operation display section yx 050 I a loot 15 TOO iy TOO ON OFF operate stop button 091099 Temperature buttons ECONO COOL button Fan speed control button aT Ta Vane control button Operation select button Timer mode select button Time set buttons RESET 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 INDOOR UNIT DISPLAY SECTION Operati
29. ed 6 minutes later NO tion of the indoor outdoor Yes connecting wire 1 Miswiring may damage indoor electronic control P C Y board during the operation Turn OFF the power supply Be sure to confirm the wiring is correct before the opera Check once more if the indoor outdoor tion starts connecting wire is not miswiring x3 Be sure to check this within minutes after turning ON Bridge the outdoor terminal block S2 and After 3 minutes LED blinks 6 times Even when the S3 X1 inverter P C board is normal LED blinks 6 times after 3 Y minutes Turn ON the power supply Is the bus bar voltage of the inverter P C board normal Refer to TEST POINT DIAGRAM AND Check of power supply gt Refer to the outdoor VOLTAGE in the outdoor service manual NO service manual la Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec m CF quick blinking x3 No Replace the inverter P C board 2 Lighted yes or not X2 Be careful of the residual voltage of smoothing lighted capacitor Turn OFF the power supply Remove the bidge between the outdoor terminal block S2 and S3 Turn ON the power supply Y Check the wiring R If there are any error of the indoor outdoor connecting wire indoor terminal block 1 52 N such as the damage of the wire intermediate connection 9 o and or poor contact to the terminal block replace the indo
30. f Outdoor unit Cause of room indoor fan of indoor power sys thermistor outdoor con Other ab Indoor Outdoor temperature motor unit control tem abnor outdoor unit trol system normality unit indoor coil system mality Miswiring or thermistor trouble of serial signal Refer to 9 6 How to check mis wiring and serial signal error OBH685 Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test point diagram and voltage Refer to 9 6 Check of indoor fan motor Replace the indoor elec tronic control P C board Refer to How to check inverter com pressor Refer to Check of outdoor ther mistors Replace the inverter P C board Check Flow chart of the detailed 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 Lighted O 3 Blinking Not lighted Abnormal point Operation indicator lamp Symptom Condition Remedy Upper lamp flashes 0 5 second ON Miswiring or serial signal 60808080 0 5 second OFF Upper lamp flashes 2 time flash
31. 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 lt gt gt gt lt gt p hr SL mg OFF lt 7 lt 7 lt gt lt B Beeps B Beeps gt Beeps t Repeated cycle t Repeated cycle Repeated cycle 3 3 Blinking pattern when the outdoor unit is abnormal mE Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval lt gt lt gt lt gt lt gt LILI NY OFF M H 4 47 4 1 gt 4 4 No bee Beeps No bee Repeated cycle Repeated cycle OBH685 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
32. he timer Each time this button is pressed the set time increases by 1 hour NOTE 1 Be sure to place the remote controller at the position where its signal can reach the air conditioner even during TIMER operation 2 Reset the timer in the following cases or the set time may deviate and other malfunctions may occur A power failure occurs The circuit breaker functions 3 The OFF TIMER and ON TIMER can not be set at the same time Example 1 Setting to stop the air conditioner 3 hours later Press button to select OFF TIMER O O 3 Press GD button to set the 3h Example 2 Setting to operate the air conditioner 7 hours later Press button to select 3 Press button to set the 7h O h 2 To release the timer Press 5 button until O O OFF TIMER and ON TIMER are not displayed OBH685 M 8 6 8 8 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 Operation mode COOL HEAT 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 o
33. ing dB A 49 44 38 32 49 44 38 33 49 45 41 34 Heating 46 40 35 30 48 43 38 33 49 45 41 32 Cond drain connection O D 5 8 31 7 16 43 5 16 Dimensions 9 1 8 9 3 8 11 5 8 12 13 16 Weight 22 37 External finish Munsell 1 0Y 9 2 0 2 Control voltage by built in transformer NOTE Test conditions are based on AHRI 210 240 OBH685 12 24 VDC 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 ft s position where the air speed is 1 ft s Dry 20 6 29 5 when air is blown out horizontally from MSZ HE09NA Dry 163 235 nom 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 HE12NA Dry 16 3 23 5 ing to the size of the room and furniture arranged inside the room Model Function Coverage ft 14 5 21 0 Dry 23
34. l P C and the varistor in any case board visually Is the fuse F11 blown only No Yes X1 The fan motor connector s lead wire is red whereas is black Measure the resistance between X2 Connect 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 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 P C resistor R111 approxi N indoor terminal P C board mately 4 O 9 board and the indoor fan tor li 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 O 12 VDC Are connector CN10A on the indoor electronic control P C Connect the connector or repair 5 VDC board or lead wires discon Yes disconnection ndoor terminal P C board ndoo
35. mperature 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 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 7 v a4 _ 1 2 3 4 5 SWING AUTO 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 starts 4 VANE AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tempera ture 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 OBH685 n 5 STOP operation OFF ON TIMER standby In the following cases the horizontal vane returns to the closed positio
36. n 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 1 for dew prevention 7 SWING N mode By selecting SWING mode with VANE CONTROL button the horizontal vane swings vertically 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward 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 Also the horizontal 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 or VANE CONTROL button 8 5 TIMER OPERATION 1 How to set the timer 1 Press OPERATE STOP ON OFF button to start the air conditioner 2 Press TIMER MODE SELECT button 5 to select the operation OFF TIMER gt ON TIMER gt TIMER RELEASE Each time this button is pressed the timer mode is changed in sequence 3 Press TIME SET button 9 to set t
37. ndoor 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 NOTE For modification take out the batteries and press the OPERATE STOP ON OFF button 2 or 3 times at first After finish modification put back the batteries then press the RESET button O 8 4 78 614 1 mis 7 The board has the print J1 and J2 Solder J1 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
38. o o z 5 i CN20A Tee 6 q gt E Ro ome a 2 2 ad dcc ce 2 1 Seis O O Refer to 9 6 ig Bg S57 9 CAUTION Indoor fan motor DMO0N335 c Joints CN211 Emergency Timer short mode point D 294 325 VDC operation switch JPG JPS Refer to 7 1 GND SW high voltage 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 Resistance kQ 32 50 68 86 104122 140 Temperature F OBH685 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 Pull the terminal while pull out the terminal pushing the locking slowly lever Connector 10 1 MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA NOTE Turn OFF power supply before disassembly OPERATING
39. on 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 The unit is operating to About Cor more reach the set temperature Bc fromiset tempera xt Blinking O Not lighted The room temperature is About 2 to 4 F 1 to 2 C approaching the set tem perature from set temperature 8 1 COOL 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 TOO WARM or TOO COOL button to select the desired temperature The setting range is 61 88 F 16 31 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 OBH685 s 8 2 DRY 5 OPERATION 1 Press OPERATE STOP ON OFF button
40. or outdoor connecting wire Yes Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal No Yes Y 7 E Is there 2 VDC or less between CN10A Turn OFF inverter controlled lighting and JPG GND on the indoor electronic equipment control P C board Turn OFF the power supply and then Yes No turn ON again Press EMERGENCY OPERATION Is there 2 VDC or less between Is there 2 VDC or less between switch CN10A and JPG GND on CN10A and JPG GND on the indoor electronic control P C the indoor electronic control P C Yes Reinstall board board either the unit No Yes No or the light away from Is serial signal each other error indicated 6 Attach a filter minutes later on remote control receiv ing section Replace the indoor power Replace the indoor elec P C board and the indoor tronic control P C board terminal P C board of the indoor unit 27 OBH685 MSZ HE24NA Turn OFF the power supply D Y Is there rated voltage in the power supply Y Yes Turn ON the power supply Y No Check the power supply unit gt Is there rated voltage between outdoor terminal block S1 and S2 Check the wiring yres Press EMERGENCY OPERATION s
41. perates 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 OPERATION OPERATION switch is pressed operation 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 Check room temperature thermistor Refer to 9 7 Test point diagram and voltage Refer to How to check inverter com pressor Refer to Check of R V coil Refer to 9 6 Check of remote controller and indoor elec tronic control P C board 1 Check indoor out door connecting wire Check if the power is supplied to the indoor unit Refer to 9 6 Check of indoor P C board and indoor fan motor Upper lamp Upperlamp Upperlamp Upperlamp Upper lamp Upper lamp Flash ON 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 7 flash 14 time flash and OFF at Cause Cause Cause Cause Cause Cause or more 0 5 second Indoor unit Indoor unit Indoor unit Outdoor unit Outdoor unit Outdoor unit Cause intervals Trouble Trouble of Trouble Outdoor e Trouble of Trouble o
42. peration is for servicing The indoor fan runs at High speed and the temperature The operation mode is indicated by the Operation Indicator lamp as following control does not work After 30 minutes of test run operation the system shifts to EMERGENCY EMERGENCY lt lt COOL HEAT MODE with a set temperature of 75 F 24 C The fan COOL speed shifts to Med All protective operations such as the coil frost prevention works even in the test run or emergency operation EMERGENCY In the test run or emergency operation the horizontal vane operates in HEAT VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote STOP controller In the latter case normal operation will start Set temperature 75 F 24 C 75 F 24 C Fan speed Med Med Horizontal vane Auto Auto NOTE Do not press EMERGENCY OPERATION switch during normal operation 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 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 OBH685
43. r power P C board nected lt R111 Replace the indoor electronic control P C board Varistor NR11 lt rCcN211 OBH685 52 24 Turn OFF the power supply Remove indoor fan motor connector CN211 and ES Measure the resistance between CN211 Short circui vane motor connector CN151 from the indoor electronic and of the indoor fan motor connector Replace the indoor fan motor control P C board and turn ON the power supply 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 gt 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 x3 Yes Are the varistor NR11 burnt No Y 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 15 the fuse F11 blown only yes x1 The fan motor connector s lead wire is red whereas is black Measure the resistance between X2 Connect of the tester to fan motor connector s lead CN211 and of the in
44. rd 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 error ind minutes signal icated 6 later of the indoor unit OBH685 28 B Electromagnetic noise enters into TV sets or radios Is the unit grounded No Ground the unit Yes Is the distance between the antennas and the indoor unit within 9 91 ft 3 m 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 ft 1 m or is the distance between the radios and the indoor unit or the TV sets or TV sets or radios and the outdoor unit Yes radios and the outdoor unit within 9 91 ft 3 m 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 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 antenna
45. remove the indoor electronic con trol P C board 11 Remove the room temperature thermistor from the indoor electronic control P C board OBH685 Remove 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 Refer to 2 2 5 3 Remove the ground wire connected to the indoor heat exchanger from the electrical box 4 Unhook first the lower then the upper catches of the electrical box and pull out the electrical box 5 Disconnect all the connectors on the indoor power P C board and unhook all lead wires 6 Remove the screw of terminal block on the indoor ter minal P C board 7 Remove the indoor power P C board and the indoor terminal P C board Terminal block 33 Photo 2 Ground wire Electrical box 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 3 Indoor terminal P C board Upper catch Lower catch Catch of indoor electronic control Screw of the P C board holder conduit cover Screw of the conduit plate OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly Photo 4 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to 2 2 5 3 Remove th
46. ronic wiring refer to the il CN10A THERMISTOR SUB outdoor unit electronic wiring diagram for servicing PE o CNH 5 TRANSFORMER 2 CN151 H ft it m Eoi li 3 Symbols indicate Terminal block a TB TERMINAL BLOCK Boog Connector TUE X disconnect should be RTI2 CN112 required by local code EN INDOOR ELECTRONIC PUE aL P C BOARD MSZ HE24NA ME S S S S INDOOR ELECTRONIC 71 SYMBOL NAME FROM OUTDOOR UNIT __ __ bog CONNECTING WIRES i TB 3T LD201 T jLD201 M 11 CONTROL P C BOARD CN211 Fil FUSE ee PS El 51 el Ire 1 j RED T3 15AL250V I 1 i NR11 phase 0 wht MF FAN MOTOR PEL el m VANE MOTOR I CONNECTING N HORIZONTAL BORN E eH E O T INDOOR TERMINAL o Ri RESISTOR EE CN111 QD P C BOARD _ of Sm ROOM TEMP 1 11 THERMISTOR O4 1 RT12 COIL TEMP NOTES 1 About the outdoor side electronic wiring refer to the oL ae RT12 outdoor unit electronic wiring diagram for servicing BLK Do us CN112 i AN 2 Use copper conductors only RT13 T P For field wiring Terminal block Lot I RT 3 THERMISTOR SUB mbols indicate Terminal bloc i 6000 Connector enisi CN10A TRANSFORMER X A disconnect should be required by local code 1B TERMINAL BLOCK OBH685 CN20A DISP REC SW BOARD
47. rter fluorescent light is turned on when the room is warm the unit may be able to operate with the remote controller Replace the remote controller gt Reinstall the unit away from lights Attach a filter on receiving part Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving part Replace indoor electronic control P C board Check of indoor board and indoor fan motor MSZ HE09 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 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 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 Is the varistor NR11 burnt and the fuse F11 N blown 9 Turn OFF the power supply Check both parts side and pat Be sure to check both the fuse tern side of the indoor termina
48. s close Yes ing of the antennas Is the distance between the TV sets or radios and the indoor unit within 3 28 Extend the distance between the TV sets and or 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 followings 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 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
49. 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 OBH685 9 7 TEST POINT DIAGRAM AND VOLTAGE 1 Indoor power P C board Indoor terminal P C board MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA Indoor terminal P C board Indoor power P C board Fuse F11 yx Varistor NR11 Resistor R111 SUAS SE n wa O iar 44 OK Od de o Indoor fan motor CN211 SF o gt Q 294 325 VDC el L S GND high I O i jenan E voltage DC 15 VDC of 3 6 VDC 0 6 V Terminal 9 i block 9 lt o o m 93 6 s A Connector to indoor electronic 5VDC 12VDC GND control P C board CN20A Please replace the fuse after removing the indoor terminal board from the electrical box 2 Indoor electronic control P C board MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA Timer short mode point JPG JPS Refer to 7 1 Room temperature thermistor RT11 CN111
50. 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 back lid and insert batteries Press RESET button with a thin instrument and Then reattach the back lid then use the remote controller RESET button Insert the negative pole of the batteries first Check if the polarity of the batteries is correct 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 OBH685 k 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 function Turn the power supply lt Preparation of the remote controller gt D Whil
51. tor main RT12 OBH685 35 Photo 5 Screw of the line flow fan Photo 6 Motor band Screws of the A motor bed Photo 7 Screws of the left side of the heat exchanger 10 2 MSZ HE24NA OPERATING PROCEDURE NOTE Turn OFF 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 board the power monitor receiver SW P C board and the indoor 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
52. ts of inverter or rapid start type within the range of 3 28 ft 1m x2 ye Replace the indoor electronic control board Including the receiver Replace the batteries Refer to 9 1 4 No Not clear No gt Turn ON radio to and press OP ERATE STOP ON OFF button on the remote controller 1 Y Is noise heard from radio pe Are there any fluorescent lights of inverter or rapid start type within the range of 3 28 ft 1m x2 Yes No Yes M to No 2 and No 3 when the remote controller easure the voltage between power moni r receiver SW P C board connector CN20A button is pressed Refer to 9 7 3 Y Is the voltage approximately 4 VDC No Replace power monitor receiver SW P C board 24 Yes x 1 Look at the image of the signal transmitting section of 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 ler is pressed However it may be difficult to see the illuminated LED of the signal transmitting section with a smartphone camera 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 inve
53. witch once Y Does the OPERATION INDICATOR lamp light up lt Confirmation of the power to the indoor N o Y Yes Is there any miswiring Is serial signal error indicated 6 minutes poor or Wire disconnection of the Correct them later No Yes indoor outdoor connect Yes ing wire No lt Y X1 Miswiring may damage indoor electronic control P C 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 53 1 Y Turn ON the power supply Y X3 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 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 No Yes Y Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking x3 Yes Y Replace the inverter P C board 2 Lighted X2 Be careful of the residual voltage of smoothing or not capacitor lighted Turn OFF the power supply Remove the bridge between the outdoor terminal block S2 and S3 Replace the indoor electronic control P C boa

SERVICE MANUAL MSZ-HE09NA MSZ-HE12NA

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