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SERVICE MANUAL MFZ-KA09NA MFZ-KA12NA MFZ

1. with narrow upper and lower horizontal ZX bars so that the airflow from the upper Partition board g and lower air outlets does not contact 4 E the bars If the horizontal bars will block 22 5 the lower air outlet use stand to 5 adjust the height of the indoor unit If the 3 15 16 100 Upper air outlet Sr more ESO al cla upper or lower air outlet is blocked the I Dade ccc amp amp Crating Indoor unit air conditioner will not be able to cool or 1 1 3206 a 7 E warm the room well F1 i m Farinon board Do not block the receiver with the grat NE Z i 7 Backboard ing Otherwise the grating will interfere ES F 8 A with the remote controller signal and sig g 518 nificantly reduce the distance and area 5 pe angle from which the signals can be j 8 MEE received egt t wc L C Lower air outlet Partition board Q0 85 538 Use a grating with vertical bars etc that has at least 75 open area If the grating has horizontal bars or if the open area is less than 7596 performance could be reduced When the indoor unit is embedded in a wall built in the time it takes for the room temperature to reach the set tem perature will increase
2. EMBEDDED INDOOR UNIT SETTING Control board MUST BE PERFORMED Cut anjel When embedding the indoor unit in a wall restrict Jc ET ma the movement of the horizontal vane for the upper air outlet so that it only operates horizontally O O 16 m fthis setting is not performed heat will build up in the wall and the room will not be cooled or warmed properly 1 Cut the wires on the left and right sides of JRFBL Cut the JRFBL wires using a pair of nippers etc as shown here OBH568A Cut the wires on both ends Dn 11 ECONO COOL Zt 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 according to the temperature of indoor heat exchanger indoor coil ther mistor 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 ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode 8 6 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 0 00 AM blinks at the current time d
3. 20 Catechin air filter J D Panel 1 Air cleaning filter Anti Allergy Enzyme Filter blue bellows type Damper i i i Remote controller Air outlet Vertical vane Air inlet Display and operation section When the front grille is opened Operation indicator lamp Emergency operation Sli gt 0 Remote control receiving section Air outlet selection switch NG OBH568A 2 MFZ KA09NA MFZ KA12NA MFZ KA18NA Drain hose Remote controller holder Fixing screw for 2 3 5 x 1 6 mm Black Pipe cover Band Battery AAA for remote controller Indoor unit mounting bracket Fixing screw for 2 4 x 25 mm Wood screw for the indoor unit fixation Washer of Felt tape Used for left or left rear piping Wireless remote controller 8 oO ejeeoejejeejeo Air cleaning filter ININ IN MFZ KA09NA MFZ KA12NA MFZ KA18NA REMOTE CONTROLLER Signal transmitting section J Operation display section J OPERATE STOP ONOFF 1999 ON OFF button ON OFF e ees SLOPE us In ND
4. seconds When it stays ON for 3 seconds without beep Yes The outdoor unit is abnormal No Y Y T The outdoor unit is abnormal The indoor unit is abnormal ars Check the blinking pattern and identify the abnormal point by referring to the reas e MUR aenema point by referring indoor unit failure mode table Refer to 9 2 2 ibas Eni Ys i table Re p en M manual Make sure to check at least two consecutive blinking cycles 2 sure to eheeicatieast wo consecutive blinking cycles r 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 X1 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 afte
5. NOTE Test conditions are based on ARI 210 240 3 1 OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V in 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 6 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 66 15 4 when air is blown out horizontally from MFZ KAO9NA Dry 63 146 Er properly at the High speed posi 6 1 14 2 The coverage should be used only as a Dry 6 7 15 6 general guideline since it varies accord MFZ KA12NA Dry 64 150 ing to the size of the room and furniture arranged inside the room Function Coverage ft 6 2 14 5 Dry 8 7 20 0 MFZ KA18NA Dry 7 9 18 3 7 5 17 5 OBH568A 4 OUTLINES AND DIMENSIONS MFZ KA09NA MFZ KA12NA MFZ KA18NA Unit inch 5 5 32 5 5 32 4 41 4 Hole S 9 Y 1 Installation plate S als e N L J Indoor unit y 27 9 16 N 1 27 32 23 29 32
6. FAN SPEED CONTROL button OPERATION SELECT button 4 Ts E OFF TIMER button ECONO COOL VANE OSTART ECONO COOL button a ICs ON TIMER button SMART S amp T gt TIME SET buttons TIME FORWARD button ED BACKWARD button ir il t CLOCK SET butt RESET button uton VANE CONTROL button V Once the operation mode is set the same operation mode can be repeated by simply turning OPERATE STOP ON OFF but ton ON Indoor unit receives the signal with a beep tone When the system turns OFF 3 minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes 8 1 COOL 2 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 C OBH568A ix 29 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 temperatur
7. NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller f main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled If the unit has been turned 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 tripping 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 OBH568A 8 MICROPROCESSOR CONTROL MFZ KA09NA MFZ KA12NA MFZ KA18NA WIRELESS REMOTE CONTROLLER Signal transmitting section MITSUBISHI ELECTRIC Operation display section OPERATE STOP ON OFF button Temperature buttons Indication of remote controller model is on back ON OFF CD SL 9 9 SMART SET button
8. 0 15 V 3 6 VDC 15 VDC GND high voltage DC 0325 VDC JROS JRO6 GND DC SS Modification point for individual operation Refer to 7 2 Indoor coil thermistor RT12 RT14 RT15 MAIN RT13 SUB Room temperature thermistor RT11 12 VDC Resistance kQ 0 10 20 30 40 50 60 Temperature C OBH568A 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 GPull the terminal while pull out the terminal pushing the locking slowly lever Connector MFZ KA09NA MFZ KA12NA MFZ KA18NA INDOOR UNIT NOTE Turn OFF the power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panel Photo 1 1 Push both sides of the upper part of the front grille and pull the front grille open and then remove the front grille from the panel See Photo 1 2 Remove the screws of the panel See Photo 2 3 Open the horizontal vane and push the left right and middle of the upper part of
9. MITSUBISHI Revision A e OUTLINES AND DIMENSIONS has ELECTRIC been corrected Some descriptions have been modified Please void OBH568 SPLIT TYPE AIR CONDITIONERS INDOOR UNIT No OBH568 REVISED EDITION A SERVICE MANUAL Models MFZ KAO9NA MFZ KA12NA MFZ KA18NA Outdoor unit service manual MXZ B NA Series OBH560 CONTENTS 1 TECHNICAL 2 2 PART NAMES AND 2 JSSPECIFICATION m 4 4 OUTLINES AND DIMENSIONS 5 5 WIRING DIAGRAM rnnnn 6 6 REFRIGERANT SYSTEM 7 7 SERVICE FUNCTIONS n 8 8 MICROPROCESSOR CONTROL 10 9 TROUBLESHOOTING tee 16 MFZ KA09NA 10 DISASSEMBLY INSTRUCTIONS 30 MFZ KA12NA PARTS CATALOG OBB568 MFZ KA18NA TM NOTE RoHS compliant products have G mark on If the spec name plate e Revision A OUTLINES AND DIMENSIONS has been corrected Some descriptions have been modified 1 TECHNICAL CHANGES MFZ KA09NA MFZ KA12NA MFZ KA18NA 1 New model 2 PART NAMES AND FUNCTIONS MFZ KA09NA MFZ KA12NA MFZ KA18NA Vertical vane Front grille Nu Fan guard Air outlet T Horizontal vane
10. 5B TOO ri TOO WARMUDCOGL 925 ACCESSORIES FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button OBH568A Indication of Temperature buttons SMART SET button RESET button remote controller model is on back MODE FAN STOP 6 s 9 9 OFF TIMER button ECONO COOL VANE OSTAR JCH ON TIMER button SMARTSET EC TIME SET buttons TIME FORWARD button K BACKWARD button eE CLOCK SET button VANE CONTROL button V 3 SPECIFICATION Indoor model MFZ KA09NA MFZ KA12NA MFZ KA18NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch 15 Airflow COOL Dry CFM 314 251 205 169 321 261 215 177 394 325 279 251 Super High High Med Wet 303 241 197 163 309 252 207 170 379 313 269 241 Low Quiet HEAT Dry CFM 332 219 198 177 335 219 201 184 434 297 275 261 Sound level Cooling dB A 41 36 31 26 46 42 38 35 Super High High Med 40 35 30 25 Low Quiet Heating 41 36 31 28 47 42 38 35 Cond drain connection O D 5 8 27 9 16 7 7 8 23 5 8 Weight 32 External finish White Control voltage by built in transformer 12 24 VDC Dimensions
11. Board Fuse F11 JRO5 JRO6 JRO5 ROS z ah VARISTOR NR11 Co ICt01 No 1 unit No modification No modification No 2 unit Cut off JRO5 No modification CNIXE CN1Y1 No 3 unit No modification Cut off JROG Rimen EX 2 No 4 unit Cut off JRO5 Cut off JROG EIS NOTE After modification turn ON the power supply and with the remote controller headed towards the indoor unit press the OPERATE STOP ON OFF button If 1 or 2 beeps is heard from the indoor unit modification is completed correctly OBH568A S 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 The AUTO RESTART FUNCTION sets to work the moment power is restored after power failure Then the unit will restart automatically Operation 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 release AUTO RESTART FUNCTION D Turn off the main power for the unit Solder the Jumper wire to JRO7 on the indoor electronic control P C board Refer to 9 7 CN111 CN112 CN113 CN106
12. OBH568A Damper When the damper is not located at the designated position 18 Refer to 9 6 Check of damper EM 9 3 INSTRUCTION OF TROUBLESHOOTING qus Indoor unit operates Indoor unitdoes OPERATION INDICATOR Outdoor unit Outdoor unit does the signal from lamp on the indoor unit is does not not operate normally g flashing ON and OFF remote controller operate If blinking of OPERATION Outdoor unit Outdoor unit Unit does i Indoor unit Indoor unit INDICATOR lamp cannot be operates only does not not operate Operates when does not operate checked it can be checked with in Test Run operate normal EMERGENCY when failure mode recall function operation even in operation in OPERATION EMERGENCY x1 Test Run COOL or switch is pressed OPERATION operation HEAT mode switch is pressed x1 x1 Test Run operation means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed Check room Refer to Refer to Refer to 9 6 1 Check goor outdoor i How to check connecting wire nana inverter RV coll do EIS Check we sang NE Refer to 9 7 compressor abd Facsivor ROSCOE DRE e npe Refer to outdoor unit service
13. and while the fan motor is rotating Is 0 VDC or 15 VDC held unchanged Replace the indoor electronic control P C board Yes Unchanged Replace the indoor fan motor OBH568A Check of remote controller and indoor electronic control P C board Check if the remote controller is exclusive for this air conditioner Switch on the remote controller B No display on the remote Replace the batteries Refer to 9 1 4 controller visible not clear x 1 Look at the image of the signal transmitting section of Yes 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 Remove the batteries then set them back ERATE STOP ON OFF button on the remote control 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 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 Yes i operate with the remote controller No Is noise heard from
14. 1 27 32 e o c s Y ge g 13 9 32 13 9 32 5 15 32 7 7 8 e d X gt Airout 9 5 5 K aE Vo More than iwi 3 7 8 Airin ias Gas pine 09 12 43 8 flared ED ie 18 8 euler Liquid pipe amp 7 6 Air out 8 More than 3 7 8 8 1 16 6 1 2 4 15 16 a 3 4 15 32 didi 5 1 2 3 8 2 3 8 OBH568A 5 WIRING DIAGRAM MFZ KA09NA MFZ KA12NA MFZ KA18NA OBH568A 152 INDOOR ELECTRONIC 3 CONTROL P C BOARD FROM OUTDOOR UNIT BLK CONNECTING WIRES POWER SUPPLY 208 230V pax d gt x A disconnect should be To ouTooor required by local code m CONNECTING WIRES LIJ Dci2 4v OUTDOOR UNT CO CONNECTING WIRE wen NAME ww NOTES UPPER raw MOTOR 1 ROOM THERMISTOR About the outdoor side 2 LOWER raw MOTOR aTi mermistor wA wn electric wiring refer to wi HORIZONTAL VANE MOTOR RTi3 cor Thermistor Sum the
15. Outdoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate coro Terminal block Connector 2 DAMPER MOTOR RTI4 COIL TEMP THERMISTOR MAIN2I ML2 DAMPER LOCK MOTOR LEFT DBiii DIODE STACK 151 DAMPER LIMIT SWITCH OPEM VARISTOR F11 Fuse T3 15AL2SO 6 REFRIGERANT SYSTEM DIAGRAM MFZ KA09NA MFZ KA12NA MFZ KA18NA Unit inch Refrigerant pipe 3 8 MFZ KA09 12NA Refrigerant pipe 1 2 MFZ KA18NA with heat insulator Flared connection Indoor coil MU d thermistor RT12 main Distributor Indoor coil thermistor RT12 RT14 RT15 main RT13 sub Room temperature thermistor RT11 Flared connection Refrigerant pipe 1 4 Refrigerant flow in cooling with heat insulator gt Refrigerant flow in heating OBH568A d 7 SERVICE FUNCTIONS MFZ KA09NA MFZ KA12NA MFZ KA18NA 7 1 TIMER SHORT MODE For service the following set time can be shortened by bridging of JPG and JPS on the electronic control P C board Refer to 9 7 Set time 3 minutes gt 3 seconds It takes minutes for the compressor to start operation However the starting time is shortened by bridging of JPG and JPS 7 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote contr
16. SMART SET button 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 is missing or has failed or when the batteries of 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 operation is for servicing The indoor fan runs at High speed and the temperature control does not work After 30 minutes of test run operation the system shifts to EMERGENCY COOL HEAT MODE with a set temperature of 75 F 24 C The fan speed shifts to Med The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation Operation mode COOL HEAT Set temperature 24 24 The following indication does not depend on the shape of lamp OPERATION INDICATOR lamp _ EMERGENCY OPERATION switch PressoncssQoob 28 Lighted DP Not lighted Press again Heat Ol cme AN Press on
17. When the upper and lower air outlets are selected with air outlet selection switch vane angle is fixed to Angle 3 5 STOP operation OFF and ON TIMER standby When the following cases occur 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 3 5 when the compressor cumulative operation time exceeds 30 minutes to 1 hour the vane angle automatically changes to Angle 1 for dew prevention 7 SWING MODE z By selecting SWING mode with VANE CONTROL button the horizontal vane swings vertically The remote controller displays 7 SWING mode is cancelled when VANE CONTROL button is pressed once again 8 Cold air prevention in HEAT operation The vane angle changes to Horizontal position automatically to prevent cold air blowing on users 9 Damper operation NOTE 1 Be sure to turn OFF the air conditioner before changing the switch setting With this function air comes out simultaneously from the upper and lower air outlets so that the room can be cooled or heated effectively This function is set using the switch behind the front grille of the indoor unit This function is available in cooling and heating operation OBH568A SSS 1 How to set to blow out air from the upper 2 How to set t
18. 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 After checking the above consult the service representative OBH568A a 9 7 TEST POINT DIAGRAM AND VOLTAGE MFZ KA09NA MFZ KA12NA MFZ KA18NA Indoor electronic control P C board Room temperature thermistor RT 11 FUSE F11 T3 15AL250V Power suppl input 208 230 VAC Indoor coil thermistor RT14 MAIN 2 Indoor coil thermistor RT13 SUB Indoor coil thermistor RT12 MAIN 1 Indoor coil thermistor RT15 MAIN 3 Release of Auto restart function 9 99 O9 Po ov 7 soci Solder the Jumper wire to JRO7 THE ds Mal Refer to 7 3 5 VDC orama _ Timer short mode point JPG JPS Refer to 7 1 Varistor NR11 Display receiver P C board 1FAN 2FAN Emergency change switch operation Switch 20 Menon it e Mee Tomu zoem ren DM76J841001 CAUTION mmm 1 JEV AK jt er Horizontal vane motor CN151 y Damper lock motor Right CN151 Damper motor CN152 Damper lock motor Left CN152 Indoor fan motor Upper CN211 0 15 V 3 6 VDC ot 5 VDC ED high voltage DC 5 VD E een fan motor Lower CN212
19. manual Testpoint P C board 2 Refer to 9 6 diagram and i Check of indoor voltage electronic control P C board and indoor fan motor Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp Left lamp i Left lamp PELO AD 2time flash G imeflash 4 time flash 5imeflash 6 time flash_ 7 time flash 14 time flash j15 time flash 0 5 second po MA Cause Cause Cause Cause Cause Cause intervals Irouble t Indoor unit Indoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit Indoor unit Cause doi temps Trouble of Trouble of Outdoor Trouble of Trouble of Other Trouble of es m iaire indoor fan indoor unit power thermistor outdoor abnormality damper Miswiring indoor coil motor control system in outdoor control or trouble thermistor system abnormality unit System of serial signal i Refer to 9 6 Check room Refer to 9 6 Replace the Refer to Refer to Replace the Check Refer to How to temperature 1 2 indoor How to check Check of outdoor Flow chart of 9 6 check the thermistor Check of electronic theinverter outdoor electronic the detailed Check of miswiring and indoor indoor fan control compressor thermistors control outdoor unit damper and serial coil thermis motor P C board board failure mode signal error tor recall function when Refer
20. 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 to 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally Remove the front lid and insert batteries Press RESET button with a thin instrument and Then reattach the front lid then use the remote controller Cs f Insert the negative pole of the a batteries first Check if the polarity RESET button 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 INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit Unit won t operate in case the total capacity of indoor units exceeds the capacity of outdoor units Do not connect indoor units beyond the outdoor unit capacity Operation indicator lamp f
21. thermistor and the room temperature thermistor on 9 7 Indoor fan motor Left lamp flashes 3 time flash 6080800000 2 5 second OFF Indoor unit and outdoor unit do not operate When the rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 9 6 1 2 Check of indoor fan motor Indoor control system Left lamp flashes 4 time flash 08080 8000008080 Easca i 2 5 second OFF Indoor unit and outdoor unit do not operate When 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 Outdoor power system Left lamp flashes 5 time flash eoe osososooooosgoso 2 5 second OFF Indoor unit and outdoor unit do not operate The compressor stops 3 times consecutively for over current protection or start up failure protection within 1 minute after start up Refer to Check of inverter compressor Refer to outdoor unit service manual Check the stop valve Outdoor thermistors Left lamp flashes 6 time flash 09 080808080000080 Er h ai 7 2 5 second OFF Indoor unit and outdoor unit do not operate When the outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual Outdoor control System Lef
22. to 9 7 i outdoor unit Test point i does not diagram and work voltage 19 568 9 4 TROUBLESHOOTING CHECK TABLE OPERATION INDICATOR IDE 30 Blinking 38 Lighted Not lighted Flashing of OPERATION INDICATOR lamp left hand side lamp indicates abnormalities NOTE Before taking measures make sure that the symptom reappears for accurate troubleshooting Self check table Abnormal point Operation indicator lamp Symptom Check point Countermeasure Miswiring or serial signal Left lamp flashes 0 5 second ON 6060060080 S 0 5 second OFF Indoor unit and outdoor unit do not operate When the serial signal from the outdoor unit is not received for a maximum of 6 minutes Refer to 9 6 0 How to check mis wiring and serial signal error Outdoor control System Left lamp lights up s Outdoor unit does not operate When it cannot properly read data in the nonvolatile memory of the outdoor electronic control P C board Check the blinking pattern of the LED on the outdoor electronic control P C board Indoor coil thermistor Room tempera ture thermistor Left lamp flashes 2 time flash eosooooososoo b 2 5 second OFF Indoor unit and outdoor unit do not operate When the indoor coil or the room temperature thermistor is shorts or opens circuit Refer to the characteristics of indoor coil
23. wire of the air the indoor outdoor connecting conditioner and the wiring of wire of the air conditioner and the antennas in close the wiring of the antennas E Even if all of the above conditions is 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 receiver 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 Operation condition of air conditioner when the electromagnetic noise enters 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
24. 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC CO LTD Distributed in Dec 2014 No OBH568 REVISED EDITION A Distributed in Jan 2010 No OBH568 7 New publication effective Dec 2014 Made in Japan Specifications are subject to change without notice
25. ES AME N AM SE EUN GM EET Un Rune Hum rcr SA Ege Sm m a d As for outdoor unit refer to outdoor unit service manual OBH568A gt When the left lamp of OPERATION INDICATOR lamp flashes 15 time Indoor unit and outdoor unit do not operate E Check of damper After performing the check make sure to release the failure mode recall function Turn OFF the power supply Is there anything that interferes the opening Yes a closing movement of the damper Remove the object v No Turn ON the power supply While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds Set up the failure mode recall function gt Turn ON the power supply While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds v Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller head
26. Y R he obi d x If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage mentioned in above 2 goes 0 VDC although the adjust the line flow fan indoor electronic control P C board is normal Is there 311 VDC between CN211 GX and does the voltage between CN211 and GX rise to the range between 3 and 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Indoor electronic control P C Board Replace the indoor fan motor Fuse 11 1 JRos JROG VARISTOR NR11 Co 1 1017 L3 cm CN1Y1 CN151 R111 ctr CN152 C4 CN211 Replace the indoor electronic control P C board CN242 The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops No Changed Measure the voltage between CN211 and while the fan motor is rotating Is 0 VDC or 15 VDC held unchanged Replace the indoor electronic control P C board Yes Unchanged Replace the indoor fan motor OBH568A When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0 5 second Indoor fan does not operate 2 Check of indoor fan motor lower The indoor fan motor error has occurred and the indoor fan does not operate Turn OFF the power suppl
27. ce again Stop 8 9 Changing temperature indication F C The preset unit is F C Press RESET button while the temperature buttons are pressed F Press RESET button or remove the batteries Press RESET button gently using a thin instrument OBH568A T 9 TROUBLESHOOTING MFZ KA09NA MFZ KA12NA MFZ KA18NA 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 connector housing DO NOT pull the lead wires X 7 Lead wiring Connector housing 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 abnormality indication is flashing ON and OFF before
28. e motor MV1 Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Color of the lead wire Normal BRN other one 250 235 255 BRN other 300 282 Q 3060 Damper motor MV2 Measure the resistance between the terminals with a tester Part temperature 10 30 568 Color of the lead wire Normal BRN other one 282 O 306 O 21 9 6 TROUBLESHOOTING FLOW When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted Indoor fan does not operate 1 Check of indoor fan motor upper The indoor fan motor error has occurred and the indoor fan doesn t operate Turn OFF the power supply Pay careful attention to the high voltage on the fan motor connector CN211 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 EMERGENCY OPERATION switch is pressed If more than 12 seconds passes by turn OFF the power supply and turn it ON again then measure the voltage x 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and Vv Is there anything that interferes the rotation of the line flow fan Yes
29. e operation When the outside temperature is low 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 COOL mode 8 1 1 The indoor fan maintains the actual speed of the moment 2 Low outside temperature operation Low outside temperature operation works the same way as that in COOL mode 8 1 2 NOTE Even when the damper is closed while cooling or drying operation is performed the lower fan may rotate intermit tently 8 3 HEAT Zi 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 t
30. eck above in 3 minutes Lighting hting x P LED after turning ON After 3 minutes LED ghting board x2 blinks 6 times When the inverter P C x2 Be careful of the residual Blinki board is normal LED also blinks 6 voltage of smoothing capacitor Inking times after 3 minutes A Yes EE Remove the bridge between Is th rror of th Turn OFF inverter controlled lighting outdoor terminal block S2 and S3 s there any errorofthe equipment Is th litude of 10 to 20 VDC indoor outdoor connecting wire Yes Replace the T 1 S IE AMP ICE such as the damage of the wire indoor outdoor urn OFF the power supply and then between outdoor terminal block S2 di ti nnectin turn it ON again and S3 Confirmation of serial connecting Press EMERGENCY OPERATION signal switch No Reinstall i Yes i Is there any error of the either the unit or the Is there 230 VAC a outdoor indoor outdoor connecting wire Replace the Is the serial light away terminal block S1 and S2 such as the damage of the wire indoor outdoor signal error from each Confirmation of power voltage intermediate connection poor connecting im h inal block indicated 6 other Yes contact to the terminal bloc minutes later Attach a filter No on receiving section of Replace the indoor electronic control P C board enpo Be sure to release the failure mode recall function after checking unit E CE S ECCE A
31. ed towards the indoor unit x1 1 Regardless of normal or abnormal a short beep is emitted once as the signal is received v With the remote controller headed towards the indoor unit press VANE CONTROL button Indoor electronic control P C Board v Fuse F11 H JRosJR06 Does the damper open and close VARISTOR NR11 eS 101010 Normally the damper opens closes each time VANE CONTROL button is pressed H CN151 Rit prim Ey CN152 C H CN211 Turn OFF the power supply Make the damper open by pressing CN212 Measure the resistance according to 9 5 VANE CONTROL button 1 Measure the resistance of the damper lock motors ML1 ML2 2 Measure the resistance of the damper motor MV2 v 1 Measure the voltage between CN1X1 and 2 Measure the voltage between CN1Y1 and GY No Is the resistance value normal each Yes Replace either or both damper 1 Is there OV DC between CN1X1 and limit switches open close as 2 Is there 5V DC between CN1Y1 and G follows Replace the motor Replace the indoor 1 No Replace the damper that indicates the electronic control limit switch open abnormal value P C board Yes 2 No Replace the damper limit switch close Make the damper close by pressing VANE CONTROL button Y 1 Measure the voltage be
32. f 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 Y Turn ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds Y Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit X1 y Does upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 seconds Indoor unit is normal Blinks Either indoor or outdoor unit is abnormal Ars X1 Regardless of normal or abnormal condition a short beep is emitted once the signal is re ceived s al No But the outdoor unit might be abnormal because there are some abnor Beep is ems a the same timing as the OFF malities that cannot be recalled with this way inking of upper lamp o INDICATOR lamp X2 Yes Judgment of indoor outdoor abnormality y Blinks Before blinking does upper lamp of OPERATION INDICATOR lamp stay ON for 3
33. he 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 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with AUTO operation from OFF 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 above the set temperature NOTE1 Mode selection is performed when multi standby refer to NOTE2 is released and the unit starts operation wi
34. isplay 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 gt and 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 real during operation b Set the time of the timer using TIME SET buttons and lt lt x OFF timer setting eae a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and x x Each time FORWARD button 3 is pressed the set time increases by 10 minutes each time BACKWARD button 7 is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button for To release OFF timer press OFF TIMER button 2 5 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 4 and display shows the
35. lashes as shown in the figure below When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the other for heating the operation mode of the indoor unit that operates earlier is selected The other indoor units will start the operation later cannot operate indicating as shown in the figure below In this case please set all the indoor units to the same operation mode Vly OPERATION INDICATOR Lighted Green x Vly aT 2 9 O X Blinking Green or Orange con Blinking green Standby for normal operation IR Blinking orange Standby for i save operation Not lighted When indoor units start 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 heating operation even though the indoor unit is not in operation the room may get warm or the sound of refriger ant flowing may be heard This is not a malfunction The refrigerant continuously flowing into it causes this OBH568A 19 9 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check table 9 4 disappears the memo rized failure details can be recalled This mode is very useful when the unit needs to be repaired for the abnormality which does not recur 1 Flow chart o
36. n circuit EM Replace the indoor fan motor Turn OFF the power supply Ly Measure the resistance of the horizontal vane motor coil Refer to 9 5 Short open circuit Replace the horizontal vane motor and the indoor electronic control P C board Yes Be sure to check both the fuse and the varistor in any case Is the fuse F11 blown only Measure the resistance between of the indoor fan motor connector to CN211 CN212 on the indoor electronic control P C board x1 x2 No Is the resistance 1 or more Yes Replace the fuse F11 x1 The fan motor connector s lead wire is red whereas is black X2 Connect of the tester to fan motor connector s lead wire and to lead wire otherwise the resistance cannot be measured properly Replace the fuse F11 and the indoor fan motor OBH568A Measure the cement resistance R111 on Is the resistance the indoor electronic control P C board approximately 40 N 9 Replace the indoor electronic control P C board and the indoor fan motor Yes Replace the indoor electronic control P C board 25 When the left lamp of OPERATION INDICATOR lamp flashes ON and OFF in every 0 5 second Outdoor unit does not operate D How to check miswiring and serial signal error C Turn OFF the power supply Is
37. nozzle assembly lower See Photo 10 5 Remove the screws of the damper lock motor See Photo Borgwiof Screw of Drain 11 and 12 hose the nozzle the nozzle 6 Lift the nozzle slightly and remove the lock shaft from with in the nozzle and remove the damper lock motors ML1 Photo 10 ML2 7 Remove the screws of the damper motor support and then the damper motor support 8 Remove the screws of the damper motor and then the damper motor from the damper motor support 9 Disconnect the connector from the damper motor 10 Remove the damper limit switches LS1 LS2 Lead wires of the damper motor and the damper lock motor Photo 11 7 Removing the indoor fan motor lower 1 Remove the panel Refer to 1 2 Remove the nozzle assembly lower and the drain hose Refer to 6 3 Remove the screw of the ground wire of the indoor fan motor lower and then the ground wire See Photo 13 4 Remove the screw of the motor band and then the motor band See Photo 13 5 Remove the line flow fan and the indoor fan motor lower from the box Screw of the damper motor support Screws of the damper motor Screws of the Screw of the damper damper motor support lock motor Left Photo 13 Photo 12 Screws of the damper lock motor Right Screw of Screw of the the motor band ground wire OBH568A e MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG
38. ntal vane motor connector CN151 Damper motor connector CN152 Fan motor connector CN211 Fan motor connector CN212 OBH568A a OPERATING PROCEDURE PHOTOS 4 Removing the horizontal vane motor unit Photo 6 1 Remove the panel Refer to 1 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit See Photo 6 3 Disconnect the connector from the horizontal vane motor unit Screw of the horizontal vane motor unit 5 Removing the indoor fan motor upper Photo 7 1 Remove the panel Refer to 1 2 Remove the electrical box Refer to 3 3 Remove the nozzle upper See Photo 7 4 Unhook the water cover from the catches and remove the water cover See Photo 7 5 Removing the screw of the motor band and then the motor band See Photo 8 6 Remove the line flow fan and the indoor fan motor upper from the box Nozzle Upper Photo 8 Screw of the motor band OBH568A a o OPERATING PROCEDURE PHOTOS 6 Removing the damper lock motor the damper motor Photo 9 and the damper limit switch 1 Remove the panel Refer to 1 2 Remove the screws of the nozzle assembly lower See Photo 9 3 Remove the drain hose from the nozzle assembly lower and pull out the nozzle assembly lower toward you 4 Remove the tape fixing the lead wires of the damper motor and the damper lock motor from the
39. o blow out air from the upper and lower air outlets air outlet only Set the air outlet selection switch to hi Set the air outlet selection switch to T M oa c 2m Air blows out automatically from the upper and lower air outlets as shown in the table below NOTE 2 Set the air outlet selection switch to the end correctly Otherwise air outlet cannot be selected as intended Description of operation The direction opening and closing of the damper and the volume of the airflow from the lower air outlet are controlled auto matically Operation COOL DRY HEAT Air flow Upper and lower air flow Upper air flow Upper air flow only Upper and lower air flow Upper air flow Room temperature Room temperature is Air flow temperature Air flow temperature and set temperature close to set tempera is high is low Conditions are different ture or the air During defrosting conditioner has operation start of operated for 1 hour operation etc Be sure to keep the area around the damper of the lower air outlet free of any objects If any objects block the normal operation of the damper the left operation indicator lamp may blink 10 EMBEDDING THE INDOOR UNIT IN A WALL When installing a grating use a grating Backboard
40. ollers can be used in a room In this case to operate each indoor unit individually by each remote controller both the P C boards of remote controller and the electronic control P C boards 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 Remote controller model KM05G NOTE For modification take out the batter ies and push the OPERATE STOP ON OFF button 2 or 3 times at first After finish modification put back the batteries then press the RESET button The P C board has the print J1 and J2 Solder 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 How to modify the electronic control P C board Turn OFF the power supply before modification Cut off 5 and JRO6 on the electronic control P C board according to the number of indoor unit as shown in Table 2 Refer to 9 7 Table 2 Solder both J1 and J2 Indoor electronic control P C
41. or 9 7 2 time flash 2 5 second OFF Not lighted Indoor coil thermistor Main 1 2 and sub When the indoor coil thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristic of the main 1 2 indoor coil thermistor and the sub indoor coil thermistor 9 7 3 time flash 2 5 second OFF Not lighted Serial signal error When the serial signal from the outdoor unit is not received 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 Not lighted Indoor fan motor Upper 1 time flash every 0 5 second Indoor fan motor Lower When the rotational frequency feedback signal is not emitted during 12 second the indoor fan operation Refer to 9 6 1 Check of indoor fan motor Upper Refer to 9 6 2 Check of indoor fan motor Lower 12 time flash 2 5 second OFF Not lighted Indoor control system When it cannot be read properly data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board 13 time flash 2 5 second OFF Not lighted Indoor coil thermistor Main 3 When the indoor coil thermistor short or open circuit is detected every 8 seconds during operation Replace to the characteristic of the main 3 indoor coil thermistor 9 7 14 time flash 2 5 second OFF Not lighted
42. 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 n ON fes OFF OFF OFF PM HE l OAM PM M G ddl in mE 11 l LILI OO D 6 OG ED 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 OBH568A 14 8 7 SMART SET i OPERATION 1 How to SET SMART SET operation 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT or ECONO COOL mode 3 Press SMART SET button 4 Set the temperature fan speed and airflow direction for SMART SET operation NOTE SMART SET operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode in SMART SET operation is 50 F 10 and 61 88 F 16 31 C 2 settings can be saved One for COOL ECONO COOL one for HEAT 2 How to cancel operation Press SMART SET button again SMART SET operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is selected from the next time by simply pressing
43. r 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 c P 4 4 gt oy Bo m OFF gt lt gt gt gt i 1 1 mu Beeps Beeps _ 5 Repeated cycle j Repeated cycle Repeated cycle x 3 Blinking pattern when the outdoor unit is abnormal Lt 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 gt q gt gt 4 gt 4 gt 4 OFF 1 lt gt AH No beep 5 pit No beep Beeps Repeated cycle Repeated cycle Repeated cycle OBH568A 17 2 Indoor unit failure mode table NOTE Blinking patterns of this mode differs from the ones of Troubleshooting check table 9 4 Left lamp of OPERATION INDICATOR lamp Not lighted Right lamp of OPERATION INDICATOR lamp Not lighted Abnormal point Failure mode Normal Check point Countermeasure 1 time flash every 0 5 second Not lighted Room temperature thermistor When the room temperature thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the room temperature thermist
44. radio gt Replace the remote controller Yes Are there any fluorescent lights of Yes inverter or of rapid start type within the range of 1m x2 No Turn ON a radio to AM and press OPER Does the unit with the gt ATE STOP ON OFF button on the remote remote controller controller x 1 Reinstall the unit away from lights Attach a filter on receiving part Replace the indoor electronic control P C board OBH568A a The unit cannot be operated with the remote controller Also OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch O Check of indoor P C board and indoor fan motor Turn OFF the power supply Remove indoor fan motor connector CN211 CN212 and vane motor connector CN151 CN152 from the indoor electronic control P C board and turn ON the power supply yY Does the unit operate with the remote controller Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch No Y Turn OFF the power supply Check both parts side and pattern Side of the indoor electronic control P C board visually Yes Replace the varistor NR11 and fuse F11 Are the varistor NR11 burnt V No and the fuse F11 blown Turn OFF the power supply E Measure the resistance between CN211 CN212 G and of the indoor fan motor connector Short ope
45. rical box Screw of the wire connected from the Screws of the box assembly conduit plate 3 Removing the electrical box 1 Remove the panel Refer to 1 2 Remove the electrical cover Refer to 2 3 Remove the screw of the indoor outdoor connecting wire Photo 5 and then the indoor outdoor connecting wire Remove the Indoor coil thermistor ground wire as well connector CN112 4 Remove the screw of the conduit plate and then the CN113 conduit plate Refer to Photo 4 Display receiver P C 5 Remove the screws of the wires connected from e the heat exchanger and the box assembly and then both the wires See Photo 4 6 Pull the electronic control P C board slightly toward you Disconnect the following connectors on the electronic control P C board See Photo 5 Fan motor connectors lt CN211 CN212 gt Horizontal vane motor connector CN151 Damper motor connector CN152 Display receiver P C board connectors CN106 CN125 Indoor coil thermistor connectors CN112 CN113 Room temperature thermistor connector CN111 gt Damper limit switch connectors CN1X1 CN1Y1 gt Upper nozzle assembly relay connector 7 Remove the screw of the electrical box See Photo 4 8 Unhook the electrical box from the upper catch and pull out the electrical box from the box Upper nozzle assembly relay connector Display receiver P C board connector CN125 Horizo
46. t lamp flashes 7 time flash Vr get Aad Indoor unit and outdoor unit do not operate When it cannot properly read data in the nonvolatile memory of the outdoor electronic control P C board Replace the outdoor electronic control P C board Refer to outdoor unit service manual Other abnormality Indoor unit and outdoor unit do not operate An abnormality other than above mentioned is detected Check the abnormality in detail using the failure mode recall function Refer to outdoor unit service manual Ar a ns th 2 5 second OFF Indoor unit and outdoor unit do not operate When the damper is not located at the designated position Refer to 9 6 Check of damper NOTE When the indoor unit has started operation and the above failures are detected the first detection after the power ON the indoor electronic control P C board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing OBH568A 20 OPERATION INDICATOR Vr X9 Lighted E S cor Flashing of OPERATION INDICATOR lamp right hand side lamp indicates AC AA Blinking abnormality Abnormal point A S Not lighted Operation indicator lamp Symptom Check point OPERATION INDICATOR lamp left hand side lamp is lighted Countermeasure MXZ type Operation mode Right lamp flash 600000800000 When the operation mode of the each indoor
47. th ON timer NOTE2 If two or more indoor units are operating in multi system there might be a case that the indoor unit which is operating in AUTO i3 cannot change over to the other operating mode COOL HEAT and becomes state of standby OBH568A 5 EE 8 5 AUTO VANE OPERATION 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 11 gt 21 gt 31 41 54 SWING 1 Ec o o 3 Positioning The vane presses the vane stopper once to confirm the standard position and then moves to the set angle Confirming of standard position is performed in case of follows a When the power supply turns ON b When the operation starts or finishes including timer operation c When the test run starts d When multi standby starts or finishes e When the swing operation finishes 4 VANE AUTO mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature dis tribution COOL and DRY operation HEAT operation Vane single is fixed to Angle 1 When the upper air outlet is selected with an air outlet 1 1 selection switch vane angle is fixed to Angle 5 W 3
48. the panel and pull the panel toward you See Photo 2 4 Lift up the panel and remove it from the box Photo 2 Screws of the panel Horizontal vane i5 OBH568A ix OPERATING PROCEDURE PHOTOS 2 Removing the electronic control P C board and the photo 3 display receiver P C board 1 Remove the panel Refer to 1 2 Remove the screw of the electrical cover and then the electrical cover See Photo 3 3 Remove the screw of the indoor outdoor connecting wire and then the indoor outdoor connecting wire 4 Unhook the lamp cover from the catch See Photo 4 5 Open the lamp cover Pull out the display receiver P C board and disconnect the connector on the display receiver P C board 6 Remove the screw of the wire connected from the electronic control P C board and then the wire See Photo 4 7 Pull the electronic control P C board slightly toward you from the electrical box and disconnect all the connectors on the electronic control P C board 8 Pull out the electronic control P C board from the electrical box Screw of the electrical cover Lamp cover Screw of the wire connected from the electronic control NOTE Skip 4 and 5 when the display receiver P C board P C board dose not have to be removed Screw of the ground wire Screw of the wire connected from the heat exchanger Screw of the elect
49. there rated voltage of 230 VAC in the power No the power supply y Yes Turn ON the power supply Y Is there 230 VAC between No outdoor terminal block S1 and Check the wiring 52 Yes Press EMERGENCY OPERATION switch once v Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power No supply to the indoor unit Yes Y Is there any miswiring poor contact or wire No Yes Is the serial signal error indicated 6 minutes later 5 disconnection of the gt Make them sure indoor outdoor Yes connecting wire No k d A Y Turn OFF the power supply Check once again if the indoor outdoor pi COnmecling Wire ds E Ue D d Bridge the outdoor terminal block S2 X1 Miswiring may damage indoor electronic control and S3 P C board during operation x1 Be sure to confirm the wiring is correct before the operation starts Turn ON the power supply of the outdoor unit In 3 minutes after turning ON the Inverter P C board power supply of the outdoor unit does Parts side the LED on the outdoor electronic control P C board repeat quick blinking 3 6 second OFF and 0 8 second ON BLEEP P onting Be sure to ch
50. tween CN1X1 and 2 Measure the voltage between CN1Y1 and GY Replace either or both damper 1 Is there 5V DC between CN1X1 and limit switches open close as 2 Is there OV DC between CN1Y1 G and follows 1 No Replace the damper limit switch open Yes 2 No Replace the damper i limit switch close Replace the indoor electronic control P C board OBH568A xi F Electromagnetic noise enters into TV sets or radios No Is the unit earthed gt Earth the unit Yes Is the distance between the antennas and the indoor Extend the distance between Yes i unit within 3 m or is the the antennas and the indoor distance between the antennas and the outdoor unit within 3 m Im Is the distance between the TV sets or radios and the indoor unit within 1m or is the distance between the TV sets or radios and the outdoor unit within 3 m unit or the antennas and the outdoor unit CR LA I Extend the distance between Yes the TV sets or radios and the indoor unit or the TV sets or radios and the outdoor unit the antennas damaged Yes Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in Replace or repair the coaxial cable the antenna wiring No Is the indoor outdoor Yes Extend the distance between connecting
51. unit is differently set to COOL includes DRY and HEAT at the same time the operation Outdoor unit operates but indoor unit setting 2 5 second OFF mode of the indoor unit that has operated at first has the priority does not operate Unify the operation mode Refer to outdoor unit service manual NOTE When the indoor unit has started operation and the above failures are detected the first detection after the power ON the indoor electronic control P C board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing 9 5 TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS MFZ KA09NA MFZ KA12NA MFZ KA18NA Part name Check method and criteria Figure Room temperature thermistor RT11 Measure the resistance with a tester Part temperature 10 C 30 C Indoor coil thermistor Normal RT12 MAIN1 RT13 SUB 8 kO 20 kO RT14 MAIN2 RT15 MAIN3 Indoor fan motor Upper Check 9 6 1 MF1 ae Indoor fan motor Lower Check 9 6 2 MF2 Damper lock motor Right ML1 Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Color of the lead wire BRN other one Normal 235 255 0 Damper lock motor Left ML2 Measure the resistance between the terminals with a tester Part temperature 10 30 C Color of the lead wire BRN other one Normal 2350 2550 Horizontal van
52. y Pay careful attention to the high voltage on the fan motor connector CN212 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 EMERGENCY OPERATION switch is pressed bs If more than 12 seconds passes by turn OFF the power supply and i turn it ON again then measure the voltage x 1 Measure the voltage between CN2120 and 2 Measure the voltage between CN212 and Yes xIf more than 12 seconds passes after EMERGENCY OPERATION switch Remove the object and is pressed the voltage mentioned in above 2 goes 0 VDC although the adjust the line flow fan indoor electronic control P C board is normal Is there 311 VDC between CN211 and and does the voltage between CN212 and rise to the range between and 6VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Indoor electronic control P C Board Replace the indoor fan motor Fuse F11 JRo5 R06 VARISTOR NR11 1 1017 D CN1Y1 CN151 111 Jet CN152 Replace the indoor electronic control P C board e CE The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops No Changed Measure the voltage between CN212

SERVICE MANUAL MFZ-KA09NA MFZ-KA12NA MFZ

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