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SERVICE MANUAL

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1. Outdoor unit Outdoor unit Unit does not Indoor unit Indoor unit does Test Run operation means the operates only does not operate nor operates when not operate when operation within 30 minutes af in Test Run operate even mal operation EMERGENCY EMERGENCY ter EMERGENCY OPERATION operation in Test Run in COOL or OPERATION OPERATION Switch is pressed operation X HEAT mode switch is pressed switch is pressed If blinking of OPERATION INDI CATOR lamp cannot be checked it can be checked with failure mode recall function 1 Check indoor out door connecting wire Check if the power is supplied to the indoor unit Refer to 10 6 Check of indoor P C board and indoor fan motor Refer to Check of R V coil Check room Refer to How to check inverter com pressor Refer to 10 6 6 Check of remote controller and indoor electronic control P C board temperature thermistor Refer to 10 7 Test point diagram and voltage Refer to 10 6 0 How to check mis wiring and serial signal Check room temperature thermistor and indoor coil thermis tor Refer to 10 7 Test point diagram and voltage indoor fan motor Replace the indoor elec tronic control 21 www ilmal mp pumput com Refer to Check of Left lamp Left lamp Left lamp Lef
2. lt Is the unit earthed No Earth the unit Yes Is the distance between the antennas and the indoor unit within 3 m or is the distance between the antennas and the Yes outdoor unit within 3 m Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit No Is the distance between the TV sets or radios and the indoor unit within 1 m or is the distance between the TV sets or Yes radios and the outdoor unit within 3 m Extend the distance between the TV sets and or radios and the indoor unit or the TV sets or radios and the outdoor unit No Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave
3. Insert the negative pole of the batteries first Check if the polarity RESET button 9 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 18 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 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 10 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 ON the power supply Preparation of the remote controller O While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button O First release RESET button And release the other two buttons after all LCD in operation display section of the remote c
4. NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the remote controller toward the indoor unit for 3 seconds When setting the timer for more than one day of the week or one number button does not have to be pressed per each setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit 16 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy WEEKLY 5 Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer setting is complete will light WEEKLY Press button again to turn the weekly timer OFF goes out NOTE The saved settings will not be cleared when the weekly timer is turned OFF 2 Checking weekly timer setting EDIT SEND 1 Press button to enter the weekly timer setting mode c en blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them will be displayed 9 9 i save ff OPERATION 1 How to set i save ope
5. 2 Channel frequency broadcast station affected by the electromagnetic noise 3 4 Layout of Channel frequency broadcast station unaffected by the electromagnetic noise indoor outdoor unit of the air conditioner indoor outdoor wiring earth wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the electromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise 29 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 7 TEST POINT DIAGRAM AND VOLTAGE Indoor power P C board Indoor electronic control P C board Receiver board Display board Switch board MSZ EF22VEW
6. hdytinpalvelu RefGroup Oy OPERATION INDICATOR Uu Abnormal point Operation indicator lamp Symptom Condition Left lamp lights and lower lamp flashes MXZ type Outdoor unit The operation mode of the each indoor unit V000008000008 is differently set to COOL includes DRY and e Unify the operation mode Operation e Es operates but HEAT at the same time the operation mode Refer to outdoor unit service of the indoor unit that has operated at first has manual the priority mode 2 5 second OFF indoor unit does setting not operate 10 5 TROUBLE CRITERION OF MAIN PARTS MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Part name Check method and criterion Figure Room temperature Measure the resistance with a tester PIIRSI M Refer to 10 7 Test point diagram and voltage 2 or 3 Indoor electronic RT12 RT13 control P C board for the chart of thermistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED BLK 232 2680 BLK BLK Vane motor MV 23 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 6 TROU
7. on the indoor Replace the indoor power electronic control P C board fall to Replace the indoor electronic P C board Yes 2 V or less within 12 seconds after No control P C board EMERGENCY OPERATION switch is pressed The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage CN102 Measure the voltage between CN211 s and JPG GND on the indoor Is it unchanged holding and while the fan motor is die SA 0 or 15 VDC No electronic control P C board when Yes Changed the fan motor is rotaring Unchanged Replace the indoor fan motor Y Replace the indoor power P C Le Is it unchanged holding Replace the indoor board Yes 0 or 15 VDC No board Unchanged Changed 24 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy Check of remote controller and indoor electronic control P C board XCheck if the remote controller is exclusive for this air conditioner Press OPERATE STOP ON OFF button on the remote controller Is LCD display cathe remote controller Replace the batteries Refer to 10 1 4 visible No Not clear pe Remove the batteries then set them back and press RESET button Refer to 10 1 4 C
8. After modification put back the batteries then press the RESET button 0396 001 107076 94V 0 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 Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set The setting will be cancelled if the breaker is turned OFF or the power supply is shut down Please conduct the above setting once again after the power has restored 10 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 8 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
9. Does DC 20V or more occur s N mes between indoor terminal block S2 No Replace the outdoor inverter P C board 1 controlled lighting and 3 7 Turn OFF the power supply and then Y Yes turn ON again Press EMERGENCY OPERATION Replace the indoor electronic Switch control P C board Reinstall either the unit or the light away from Is serial signal each other error indicated 6 Attach a filter minutes later on remote control receiv ing section of the indoor unit 27 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy MXZ Type turn OFF the power supply D Y Is there rated voltage in the power supply No Check the power supply Y Yes Turn ON the power supply Y No Is there rated voltage between outdoor terminal block S1 and S2 Check the wiring wies Press EMERGENCY OPERATION switch once Y Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power to the indoor unit No i Yes LET Y Is there any miswiring poor contact or wire Is serial signal error indicated 6 minutes later N disconnection of the Y Correct them es indoor outdoor connect Yes ing wire No lt y A X1 Miswiring may damage indoor electronic control P C Y board during the operation Turn OFF the power sup
10. MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES SYMBOL NAME FUSE era 1580250 Lilt REACTOR r T8 201 m 1230 L N RED MT d ii LIH o MF FAN MOTOR CONNECTING 12 24 lt i E OT e W VANE MOTOR NR11 VARISTOR e BC j Dm ROOM TEMP 0 INDOOR men e G mE i eent ae P C BOARD mm 1 THERMISTOR MAIN E R113 THERMISTOR SUB 1 ge ap dl w N Tii TRANSFORMER mi i CONTROL P BOARD TB TERMINAL BLOCK N I MV tom TO 11 LD105 M J RELAY 1100 101200 NOTES 1 side EU wiring 0 the outdoor unit electric wiring K 1 vom p e um HM diagram for servicing BDARD 3 43 11010516 1 Use copper HR only GE eeh SWITCH BON For field wiring SWITCH BOARD 3 Symbols indlate TIT Terminal block 6559 Connector 7 REFRIGERANT SYSTEM DIAGRAM MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Refrigerant pipe 29 52 MSZ EF22 25 35 42 212 7 MSZ EF50 with heat insulator Unit mm Indoor coil thermistor RT12 main Flared connection Indoor coil thermistor
11. lt Preparation before the repair service gt Prepare the proper tools e Prepare the proper protectors e Provide adequate ventilation o o After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts lt Precautions during the repair service gt e Donot perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts 2 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 1 TECHNICAL CHANGES m MSZ EF22VEW MSZ EF25VEW e MSZ EF35VEW MSZ EF42VEW er MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB e MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB e MSZ EF22VES e MSZ EF25VES re MSZ EF35VES MSZ EF42VES MSZ EF50VES 1 New model m m m m m m These models are compatible with the outdoor units with low standby power control Connecting these models to the MUZ EF VE H series outdoor units enables th
12. E 90 J I J J J D ae CS L as i 1 E J E i 4 b F 1 4 4 F bd I EZ m T E T m E 1 E 1 w i t i i C E od i j i o i i t i i o i j i z Kai L A E c 3 z 4 e 3 oa 6 e i gt i i i i 2 Sani i t 2 i 40 Pt 40 a k NC 40 a 3 z p d d zn a pu z d d 2 F 2 9 so E 9 N Y iNc30 2 E S 20 i 20 s ER E E NC 10 aL NOD E i NC 10 J 9 40 F i 9 10 E i t 4 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz 6 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy MSZ EF42VEW MSZ EF50VEW MSZ EF42VEB MSZ EF50VEB MSZ EF42VES MSZ EF50VES FAN SPEED FUNCTION SPL dB A LINE FAN SPEED FUNCTION SPL dB A LINE COOLING 42 e COOLING 43 oo Super High Super High HEATING 48 o o HEATING 49 o o 90 1 S I 1 d 90 S I D 1 E I 1 i E TEE Fi 2 amp o p E o E I E Bari ib Ee i i 5 S E NC 70 e 9 1 i F e 1 Se B a 3 5 60 3 E NC 60 gt gt Es
13. Miswiring or serial signal Left lamp flashes 0 5 second ON O 00908080 0 5 second OFF Indoor coil thermistor Room tem perature thermistor Left lamp flashes 2 time flash 000900000890800 2 5 second OFF Indoor fan motor Left lamp flashes 3 time flash w 2 5 second OFF Indoor con trol system Left lamp flashes 4 time flash eosososoooootsososoes V PS 2 5 second OFF Outdoor power sys tem Left lamp flashes 5 time flash m 000008080 prece acu 2 5 second OFF Outdoor thermistors Left lamp flashes 6 time flash 2 5 second OFF Outdoor control sys tem Left lamp flashes 7 time flash 0008009009000008 Ver N 2 5 second OFF Other ab normality Left lamp flashes 14 time flash PT PRO TN oeoe 0000 zen Indoor unit and outdoor unit do not operate The serial signal from the outdoor unit is not received for 6 minutes Refer to 10 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 10 7 The rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 10 6 Check of in door fan motor It cannot properly rea
14. electronic control P C board AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation If the main power has been cut the operation settings remain O 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 O Turn off the main power for the unit Solder the jumper wire to JRO7 on the indoor electronic control P C board Refer to 10 7 Indoor electronic control P C board JRO7 NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled If the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breaker OFF due to the rush of starting current systematize other home appliance not to turn ON at the same time When some air conditioners are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore the special counter measures are required to
15. is set correctly NOTE Timer operation will not work without setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK SET button How to set the current time a Press the CLOCK set button b Press the TIME SET buttons and to set the current time Each time FORWARD button CA is pressed the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK set button 2 Press OPERATE STOP ON OFF button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button eoN during operation b Set the time of the timer using TIME SET buttons C and Cv OFF timer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons C and Cv x x Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button e0N To release OFF timer press OFF TIMER button ecrr TIMER is cancelled and the display of set time disappears PROGRAM TIMER OFF timer and ON timer can be used in combination The timer of the set time tha
16. whether the connected outdoor unit is a low standby power model or a con ventional model will also be initialized Default compatible with a low standby power model Blinking at 0 5 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval lt gt lt gt gt lt py SS OFF gt lt gt Beeps i Beeps i Beeps Repeated cycle E Repeated cycle Repeated cycle x 3 Blinking pattern when the outdoor unit is abnormal TAM 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 lt gt lt gt lt gt q gt lt gt meg cp Dem Ge een e phi F OFF lt _ lt lt gt e a dk 7 lt gt No beep i Beeps KD No beep Beeps a Repeated cycle i Repeated cycle Repeated cycle 19 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 2 Indoor unit failure mode table The left lamp of OPERATION INDI CATOR 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 10 7 2 time flash 2 5 second OFF Indoor coil thermistor Th
17. BLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred and the indoor fan does not operate Turn OFF the power supply Pay enough attention to the high voltage on the fan motor connector CN211 EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER GENCY OPERATION switch is pressed If more than 12 seconds passes turn OFF the power supply and turn it Turn ON the power supply wait 5 seconds or more and then press Is there any foreign matter that interferes the rotation of the line flow fan No ON again then measure the voltage lt Indoor power P C board gt 1 Measure the voltage between CN211 and Yes 2 Measure the voltage between CN211 and lt Indoor electronic control P C board gt 3 Measure the voltage between CN102 and JPG GND R the forei tt d edo Pio 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 325 VDC and on the power P C board gt between CN211 O Yes rise to the range of 3 to 6 VDC within Replace the indoor fan motor and 9 12 seconds after EMERGENCY OPERATION switch is pressed Does the voltage between CN102 and JPG GND
18. F 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 Z mode By selecting SWING mode with VANE CONTROL button the horizontal vanes swing vertically When COOL DRY or FAN mode is selected only the upper vane swings 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat off this control does not work in the indoor unit 9 ECONO COOL 121 operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 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 14 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 9 7 TIMER OPERATION 1 How to set the time 1 Check that the current time
19. I E Et i F 50 J i 3 5 HM n n E g x 40 a a z z 2 2 9 9 2 2 E 20 z y z T q E x lt E i o Bc 1 n NC 10 1 j o 10 1 E i o 10 1 F F F i 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz Test conditions INDOOR UNIT Cooling Dry bulb temperature 27 C WALL Wet bulb temperature 19 C im Heating Dry bulb temperature 20 C 0 8m MICROPHONE www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 5 OUTLINES AND DIMENSIONS MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Unit mm Installation plate 81 5 895 875 10 r PUITS RW l l N I 255 L 233 Indoor unit a E I j J JN lI LI Air in Wall hole 65 v M Air out t 193 T i lt Insulation 237 O D Liquid line 26 35 0 5 m Flared connection 26 35 09 52 0 43 m Gas line Flared connection 29 52 22 25 35 42 012 7 50 Insulation 228 O D Connected part 216 O D Drain hose 8 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 6 WIRING DIAGRAM
20. MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Indoor power P C board Fuse F11 X Varistor NR11 Indoor fan motor CN211 O 325 VDC GND high voltage DC O 15 VDC O 3 6 VDC 0 or 15 VDC Connector Terminal Block CN201 Connector to indoor electronic control P C board CN202 Reactor L111 ON 5 O 2 9 oo d O 9 aN iC Gre o o Se E S gt o o ls Q d Xe jo n 9 S o O O e 9 AA 9 lt s 5 N Room temperature thermistor RT11 Indoor electronic Connector to indoor ndoer coil thermistor RT12 RT13 control P C board N 40 electronic control L L L l l 1 P C board CN102 Receiver board s i NN 12 VDC r IT Resistance N eo Vane motor CN151 CN152 Display board beget _ poison iii eie EE CLIE MUN Room temperature ther 8810 N POO MK mistor RT11 CN111 0 10 20 30 40 50 60 Temperature C GND Indoor coil thermistor RT12 RT13 CN112 Timer short mode point Release of Auto restart function JPG JPS Refer to 8 1 Solder the Jumper wire to JRO7 Refer to 8 3 Switch board Emergency ope
21. Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL No OBH589 Models MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EFA2VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB e MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES e MSZ EF50VES m m m m m Outdoor unit service manual MUZ EF VE H Series OBH590 MXZ C VA Series OB584 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND FUNCTIONS s 4 3 SPECIFICATION mannaunnaananuanananansussanassasassanaaaasansaaan 5 4 NOISE CRITERIA CURVES 6 5 OUTLINES AND DIMENSIONS M8 8 6 WIRING DIAGRAMF a 9 7 REFRIGERANT SYSTEM DIAGRAM 9 8 SERVICE FUNCTIONS e 10 9 MICROPROCESSOR CONTROL 12 10 TROUBLESHOOTING 18 11 DISASSEMBLY INSTRUCTIONS enn 31 PARTS CATALOG OBB589 NOTE C RoHS compliant products have G mark on the spec name plate C www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy
22. RT13 sub Room temperature thermistor RT11 Flared connection Refrigerant pipe 26 35 with heat insulator Refrigerant flow in cooling gt Refrigerant flow in heating 9 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 8 SERVICE FUNCTIONS MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES 8 1 TIMER SHORT MODE For service set time can be shortened by short circuit of JPG and JPS on the electronic control P C board The time will be shortened as follows Refer to 10 7 Set time 1 minute 1 second Set time 3 minutes 3 seconds It takes 3 minutes for the compressor to start operation However the starting time is shortened by short circuit of JPG and JPS 8 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room In this case to operate each indoor unit individually by each remote controller P C boards of remote controller must be modified according to the number of the indoor unit How to modify the remote controller P C board Remove batteries before modification The board has a print as shown below NOTE For modification take out the batteries and press the OPERATE STOP ON OFF button twice or 3 times at first
23. SZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Installation plate 1 Installation plate fixing screw 4 x 25 mm 5 Remote controller holder 1 Fixing screw for 3 5 x 16 mm Black 2 2 1 1 1 Battery AAA for remote controller Wireless remote controller Felt tape For left or left rear piping Soft dry cloth VEB type only 4 www ilmal mpopumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy SPECIFICATION MSZ EF22VEW MSZ EF25VEW MSZ EF22VEB MSZ EF25VEB MSZ EF22VES MSZ EF25VES Indoor model MSZ EF35VEW MSZ EF42VEW MSZ EF35VEB MSZ EF42VEB MSZ EF35VES MSZ EF42VES MSZ EF50VEW MSZ EF50VEB MSZ EF50VES Power supply ingle phase 230 V 50 Hz Power input Cooling 4 18 1 Heating 31 34 Running Cooling 14 0 18 Electrical current 21 Heating 0 32 Model RC0J40 Cooli Current 21 SN 14 0 18 Heating 0 30 0 32 Dimensions W x H x D 895 x 299 x 195 Weight 11 5 Air direction 5 Super High High Med Low Silent Super High High Med Low Silent Super High High Med Low Silent Super High Special remarks Sound level High Med Low Si
24. and JPG GND of the indoor electronic control P C board No Replace the indoor fan motor Is the approx 5 E between 5 V and JPG GND of the indoor Are connector CN10A on the indoor electronic control P C board or lead wires discon Yes nected Connect the connector or repair discon nection Replace the indoor electronic control P C board 26 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy D How to check miswiring and serial signal error MUZ EF Type Turn the main power supply OFF Y Is there rated voltage in the power supply No Check the power supply Y Yes Check for incorrect indoor outdoor connecting wiring Y A Y B Turn the main power supply ON Check for miswiring broken wires and loose Y No wire connection between the main power Is there rated voltage between outdoor terminal block S1 and S2 supply and outdoor terminal block S1 and yres between the main power supply and outdoor terminal block S2 Wait for 2 or more minutes after the main power supply is turned on Touch S2 and S3 with tester probes and start the emergency operation Y When the emergency operation starts does the r
25. ated voltage occur for 2 No seconds between indoor terminal block S2 and S3 Y yes Turn the main power supply OFF Does the indoor OPERATION No Y INDICATOR lamp left blink No 5 n continuously 6 minutes after the Does the outdoor LED light up the main power supply emergency operation starts Y Yes Y Yes Confirm that the thermostat is OFF Wait for 2 or more minutes after the main power sup and wiring is not loose ply is turned ON Touch CN202 and JPG with tester Y probes and start the emergency operation ae o Replace the outdoor inverter P C board 1 During the emergency operation I does DC 2V or more occur for 2 No Yes seconds between CN202 and Does DC 6V or more occur T A Si SES electronic control between indoor terminal block S2 Replace the outdoor inverter P C board X1 ac DORT and S3 Y Yes Yes Replace the Replace the x1 indoor power P C indoor electronic Turn the main power supply OFF Electric charge may remain immediately board control P C board Replace the indoor power P C board Y Turn the main power supply ON Y Start the emergency operation Y Does the indoor OPERATION INDICATOR lamp left blink No continuously 6 minutes after the emergency operation starts yes X after the main power supply is turned OFF Perform the procedure after 3 minutes Repair completed
26. bly 7 Remove the vane motors Refer to 5 Screws of the vane motor unit cover 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the vane motor unit cover and pull out the vane motor unit 3 Remove the screws of the vane motor unit 4 Disconnect the connector from the vane motor Screws of 5 Remove the vane motor from the vane motor unit the vane motor unit 33 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS Removing the indoor fan motor the indoor coil Photo 5 Lead wire of thermistor and the line flow fan the indoor coil thermistor 1 Remove the panel Refer to 1 and the corner box right 2 Remove the indoor electronic control P C board holder the electrical box and the nozzle assembly Water cut 3 Remove the screws fixing the motor bed 4 Release the hooks of the water cut and remove the water cut 5 Loosen the screw fixing the line flow fan 6 Remove the motor bed together with the indoor fan motor and the motor band 7 Release the hooks of the motor band and remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 5 Screws of 9 Remove the screws fixing t
27. 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 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 9 5 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with AUTO operation from OFF 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 w
28. d data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual It cannot properly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board Refer to outdoor unit service manual An abnormality other than above mentioned is detected Check the stop valve Confirm the abnormality in detail using the failure mode recall function for outdoor unit Outdoor control sys tem Y Left lamp lights up 9 Outdoor unit does not oper ate It cannot properly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board 22 www ilmal mp pumput com Check the blinking pattern of the LED on the inverter P C board or the outdoor electronic control P C board Mitsubishi ilmal mp pumput huoltaa ja korjaa J
29. e indoor coil thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 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 10 6 0 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 during the 12 seconds the indoor fan operation Refer to 10 6 0 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 10 4 20 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 3 INSTRUCTION OF TROUBLESHOOTING Start Y Indoor unit does not receive the signal from re mote controller OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF Indoor unit operates Outdoor unit does not operate normally Indoor unit oper ates Outdoor unit does not operate E
30. e low standby power control Refer to the tech nical guide OBT17 about the low standby power control These models may be connected to the MUZ EF VE H series after once connected to the MXZ VA series and operated for example because of relocation In that case the MUZ EF VE H series outdoor units will not operate without taking a step Follow the procedure described in 10 2 Deleting the memorized abnormal condition 3 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 2 PART NAMES AND FUNCTIONS MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES Front panel Air filter Nano platinum filter GE N Ec 8 RSS H Es elle v Air cleaning filter Electrostatic anti allergy enzyme filter option K Horizontal vane Heat exchanger Emergency operation switch T T Operation x x e Remote control indicator lamp i receiving section Remote controller ACCESSORIES MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW Model MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB M
31. er has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete 1 How to set the weekly timer Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode Mon CSET blinks SET 1 inn lt a 2 Press and buttons to select setting day and number E g Mon Tue Sun and 1 are selected 3378 Mon Tue Wed Thu Fri Sat Sun SET 1 1 Pressing selects the day of Pressing selects the week to be set the setting number rn ee Sat TA C 17273 4 Mon Tue Wed Thu Fri Sat Sun All days can be selected 3 Press TIME and buttons to set ON OFF time and temperature Mon Tue Wed Thu Fri Sat Sun E g ON 6 00 SET 1 oo nn Ju and 24 C are DUU CIL selected Pressing selects ON OFF timer A OON Gorr Pressing TIME Pressing TEMP Gees x v ee Kess adjusts the time adjusts the tem Pressing d J erature deletes timer setting 2 Hold down the button to change the time quickly Press and buttons to continue setting the timer for other days and or numbers 4 Press button to complete and transmit the weekly timer setting TEST Mon Tue Wed Thu Fri Sat Sun CEO which was blink ing goes out and the K current time will be displayed
32. fuse F11 X3 Yes Is the varistor NR11 burnt and the fuse F11 blown No Turn OFF the power supply Check both parts side and pattern Be sure to check both the fuse side of the indoor power P C board i and the varistor in any case visually Is the fuse F11 blown only No Measure the resistance between CN211 and of indoor fan motor connector 1 X2 gt Y Is the resistance 1MQ or more No Yes Replace the fuse F11 x3 X1 The fan motor connector s lead wire is red whereas is black X2 Connect of the tester to fan motor connector s O lead wire and to amp lead wire otherwise the resistance cannot be measured properly X3 Please replace the fuse after removing the indoor power P C board from the electrical box Replace the fuse F11 and the indoor fan motor X3 Measure the resistance of reactor 3 111 on the indoor power P C Is the resistance of reactor board PX 4 L111 approximate 2 2 0 No Replace the indoor power P C board and the indoor fan motor e Fuse F11 Indoor power Varistor P C board NR11 1 111 CN211 Indoor electronic control P C board CN10A t GND JPG electronic control P C board Is there approximate 9 V to 13 VDC between 12 V
33. he left side and the upper the motor bed right side of the heat exchanger Photo 7 Photo 8 Photo 6 10 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 8 Screw of the upper right side of the heat exchanger Screws of the left side of the heat exchanger 34 www ilmal mpopumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 35 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy aa MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN O Copyright 2010 MITSUBISHI ELECTRIC CO LTD Distributed in Nov 2010 No OBH589 New publication effective Nov 2010 Made in Japan Specifications subject to change without notice www ilmal mp pumput com
34. heck if the unit operates with the remote controller Turn ON a radio to AM and press OP Does the unit operate with the remote gt ERATE STOP ON OFF button on the controller No remote controller Yes Y Is noise heard from radio No Yes Y Are there any fluorescent lights of inverter or rapid start type within the Y range of 1 m F Replace the indoor electronic control P C board Including the receiver 25 www ilmal mp pumput com Replace the remote controller gt Reinstall the unit away from lights Attach a filter on receiving part Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy C Check of indoor P C board and indoor fan motor Turn OFF the power supply Remove indoor fan motor connector CN211 from indoor power P C board and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply Measure the resistance of indoor fan motor Refer to 10 5 Short circuit Replace the indoor fan motor Does the unit operate with the remote controller Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION Yes switch Measure the resistance of the vane gt motor coil Refer to 10 5 Short circuit Replace the vane motor and the indoor electronic control P C board No Replace the varistor NR11 and
35. hen about 15 minutes have passed with the room temperature 1 C below the set temperature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1 C above the set temperature NOTE 1 If two or more indoor units are operating in multi system there might be a case that the indoor unit which is operating in ici AUTO cannot change over to the other operating mode COOL HEAT and becomes a state of standby Refer to NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER 13 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the others for heating the operation mode of the indoor unit that operates first is selected Other indoor units cannot operate and operation indicator lamp flashes as shown in the figure below In this case please set all the indoor units to the same operation mode OPERATION INDICATOR Lighted Or Blinking Q Not lighted When indoor unit starts the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 minutes to blow out the warm air In the heating operation though indoor unit that does not operate may ge
36. it Check the blinking pattem and confirm the abnormal point wath the failure mode table Refer to 10 2 2 outdoor unit failure mode table Refer to outdoor unit service manual Make sure to check at least two consecutive blinking cycles 3X2 Make sure to check at least two consecutive blinking cycles 3 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 defective parts Deleting the memorized abnormal condition CD After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4 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 once 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 X4 The information regarding
37. lent Super High High Med Low Silent Super High Fan speed High Med Low Silent Fan speed regulator Remote controller model NOTE Test conditions are based on ISO 5151 Cooling Indoor Outdoor Dry bulb temperature 35 C Heating Indoor Dry bulb temperature 20 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 1 Measured under rated operating frequency Dry bulb temperature 27 C Wet bulb temperature 19 C 6 C www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy Specifications and rating conditions of main electric parts Fuse T3 15AL250V Horizontal vane motor 12 VDC Varistor S10K300E2K1 ERZV10D471 Terminal block 3P MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES FAN SPEED FUNCTION SPL dB A LINE FAN SPEED FUNCTION SPL dB A LINE COOLING 42 oe COOLING 42 Super High Super High HEATING 45 O HEATING 46 o O 90 I I I
38. ntrol P C board 6 Remove the indoor power P C board 7 Disconnect the following connectors Indoor electronic control P C board CN111 Room temperature thermistor CN112 Indoor coil thermistor 8 Unhook the catches of the display P C board holder from the nozzle and the electrical box right side 9 Open the rear cover of the display P C board holder and remove the switch board the display board and the receiver board Remove the indoor electronic control P C board 32 Earth wire Electrical box Screw of Ke the electrical cover Display P C board holder Catch of T electronic control P C board holder Photo 3 Upper catch Screw of the terminal block Earth wire Indoor power lt N P C board Indoor electronic control P C board the electrical box Catch of indoor electronic control P C board holder www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly Photo 4 1 Remove the panel Refer to 1 and the corner box right 2 Remove the indoor outdoor connecting wire Refer to 2 3 Remove the electrical cover Refer to 2 4 Disconnect the following connector Indoor electronic control P C board CN151 Vane motor 5 Remove the display P C board holder 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assem
39. nverter electronic control P C board or the outdoor 2 X2 Be careful of the residual voltage of smoothing capacitor If there are any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection and or poor contact to the terminal block replace the indoor A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit Y Check the wiring No Yes outdoor connecting wire No Yes Y Is there 2 VDC or less between CN102 and JPG GND on the indoor electronic control P C board ie Yes Is there 2 VDC or less between CN102 and JPG GND board Is there 2 VDC or less between 1029 and JPG GND on the indoor electronic control P C board Yes n the indoor electronic control P C es No Ye Replace the indoor power P C board Replace the indoor elec tronic control P C board No 28 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy E Electromagnetic noise enters into TV sets or radios
40. 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 2 C or more away TOM CUM OWN reach the set temperature from set temperature Lighted The room temperature is Blinking About 1 to 2 C from set approaching the set tem O Notlighted perature temperature g Standby mode Only during multi system operation 9 1 COOL lt 1 OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 16 31 C 1 Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting When the temperature of indoor heat exchanger becomes too low the coil frost prevention mode works The indoor fan operates at the set speed and the compressor stops This mode continues until the temperature of indoor heat exchanger rises 2 Low outside temperature operation When the outside temperature is lower low outside temperature operation starts and the outdoor fan slows or stops 3 Indoor fan speed control When
41. ontroller is displayed after 3 seconds Press OPERATE STOP button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit X1 X1 Regardless of normal or abnormal condition a short beep is emitted once the signal is Won Tue Wed is Fri Sat sun received 1234 Sor HOG EDU Does the left lamp of OPERATION INDICATOR 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 Ether indoor or outdoor unit is Abnormal No malities that can not be recalled with this way Gep Is emited at Me same uming ase Confirm if outdoor unit is abnormal according to the detailed outdoor unit vidi OFF onfirm i g INDICATOR lare 3 SFOPERATION failure mode recall function a 2 yes k NOTE It takes up to 1 minute to indicate the outdoor unit abnormality Judgment of indoor outdoor abnormality w Blinks Even if the OPERATION INDICATOR lamp is not lighting keep Before blinking does the left lamp of checking at least 1 minute or longer OPERATION INDICATOR lamp stay ON for 3 seconds Stays ON for 3 seconds without beep Yes The outdoor unit is abnormal No Y Th d it i The indoor unit is abnormal e out oor unit is abnormal z 4 N Check the blinking pattern and confirm the abnormal point with the indoor un
42. ply B Check once more if the indoor outdoor connecting wire is not miswiring Remove the indoor outdoor connecting wire from outdoor terminal block S3 Short circuit outdoor terminal block S2 and S3 1 X3 Turn ON the power supply Y Be sure to confirm the wiring is correct before the opera tion starts Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Y Except for outdoor unit of multi system type Is the bus bar voltage of the inverter P C board or th Refer to TEST POINT DIAGRAM AND VOLTAGE of the outdoor unit e outdoor electronic control P C board normal No Check of power supply Yes Y Does the LED on the inverter P C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking x3 No Y Lighted ES or not lighted Turn OFF the power supply Turn ON the power supply Remove the short circuit between outdoor terminal block S2 and S3 Connect the indoor outdoor connecting wire to outdoor terminal block S3 Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage Is there amplitude of 10 to 20 VDC between indoor terminal block S2 and S3 Confirmation of serial signal Replace the i
43. 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 11 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 9 MICROPROCESSOR CONTROL MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES WIRELESS REMOTE CONTROLLER Signal transmitting section TEMP OONOFF a MITSUBISHI ELECTRIC me R SENDING FAN SPEED CONTROL button VANE CONTROL button OPERATION SELECT button ME p atl Operation display sem ON ed am C Mon Tue Wed Thu Fri Sat Sun SET JCLOCKO ON DOFF 122489 00 00 thane TEMP ON OFF ECONO COOL button TIME TIMER set buttons FORWARD button BACKWARD button WEEKLY TIMER set button RESET button CLOCK SET button Temperature buttons OPERATE STOP ON OFF button Indication of remote controller model is on back 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
44. ration 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT or ECONO COOL mode 3 Press i save button 4 Set the temperature fan speed and airflow direction for i save operation NOTE i save operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode i save operation is 10 C and 16 31 C 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing i save button 9 10 EMERGENCY TEST OPERATION In case of test run operation or emergency operation use Operation mode COOL HEAT EMERGENCY OPERATION switch on the right side of the indoor unit Set temperature 24 C Emergency operation is available when the remote controller is miss Fan speed Med ing has failed or the batteries of the remote controller run down The Horzontakvane Auto unit will start and OPERATION INDICATOR lamp will light The first 30 minutes of operation is the test run operation This opera tion is for servicing The indoor fan runs at High speed and the tem The operation mode is indicated by the Operation Indicator lamp as following perature control does not work Operation Indicator lamp After 30 minutes of test run operation the sy
45. ration switch E O SW SW1 30 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 11 DISASSEMBLY INSTRUCTIONS Terminal with locking mechanism Detaching points 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 C Hold the sleeve and Pull the terminal while pull out the terminal pushing the locking slowly lever Connector MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES NOTE Turn OFF power supply before disassembling OPERATING PROCEDURE PHOTOS 1 Removing the panel Photo 1 1 Remove the horizontal vanes 2 Remove the screw caps of the panel Remove the screws of the panel 3 Unhook the lower part of the panel 4 First hold the lower part of the right end of the panel and hold the lower part of the left end of the panel 5 Pull the panel slightly toward you and then remove the panel by pushing it upward F
46. ront panel Horizontal vanes Screws of the panel 31 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 2 Remove the indoor electrical box 1 Remove the panel Refer to 1 and the corner box right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the earth 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 following connectors Indoor electronic control P C board CN151 Vane motor Indoor power P C board gt CN211 Indoor fan motor 6 Remove the screw fixing the electrical box then the upper catch of the electrical box and pull out the electrical box Removing the indoor power P C board the Switch board the display board the receiver board and the indoor electronic control P C board 1 Remove the panel Refer to 1 and the corner box right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the indoor electrical box Refer to 2 4 Remove the earth wire connected to the electrical box from the indoor power P C board 5 Disconnect the following connectors Indoor electronic power P C board CN201 Terminal block CN202 To the indoor electronic co
47. stem shifts to EMERGENCY COOL EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med EMERGENCY HEAT L Lighted The coil frost prevention works even in the test run or the emergency O Notlighted operation STOP OO In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION Switch is pressed once or twice or the unit receives any signal from the remote controller In case of latter normal operation will start NOTE Do not press EMERGENCY OPERATION switch during nor mal operation Emergency operation switch E O SW 9 11 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute time delay function operates to protect compressor from overload 17 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 TROUBLESHOOTING MSZ EF22VEW MSZ EF25VEW MSZ EF35VEW MSZ EF42VEW MSZ EF50VEW MSZ EF22VEB MSZ EF25VEB MSZ EF35VEB MSZ EF42VEB MSZ EF50VEB MSZ EF22VES MSZ EF25VES MSZ EF35VES MSZ EF42VES MSZ EF50VES 10 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
48. t is reached first will operate first e and display shows the order of OFF timer and ON timer operation Example 1 The current time is 8 00 PM Example 2 The current time is 11 00 AM The unit turns off at 11 00 PM and on at 6 00 AM The unit turns on at 5 00 PM and off at 9 00 PM Current Current ON ON ON OFF zm RE OFF OFF 500 0300 Von kenn d PILI OO O OQ 6 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 15 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 9 8 WEEKLY TIMER OPERATION A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week E g Runs at 24 C from waking up to leaving home and runs at 27 C from getting home to going to bed on weekdays Runs at 27 C from waking up late to going bed early on weekends Mon Setting1 Setting2 Setting3 Setting4 ON OFF ON OFF 24 C 27 C Fri 6 00 8 30 17 30 22 00 Setting Setting2 Sat a ON OFF 27C Sun 8 00 21 00 NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF tim
49. t lamp Left lamp Left lamp Left lamp Left lamp Flash on and 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 7 time flash 14 time flash off at 0 5 sec Cause Cause Cause Cause Cause Cause Cause ond intervals Indoor unit Indoor unit Indoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit Cause Trouble e Trouble of Trouble e Outdoor e Trouble of Trouble of Other ab Indoor Outdoor of room indoor fan of indoor power thermistor outdoor con normality unit temperature motor unit control system outdoor unit trol system Miswiring or indoor coil system abnormality trouble of thermistor serial signal Replace the inverter P C board or the outdoor electronic control P C board Check Flow chart of the detailed outdoor unit failure mode recall func tion Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 10 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 ito Abnormal point Lighted 34 Blinking Not lighted Operation indicator lamp Symptom Condition Remedy
50. t warm or the sound of refrigerant flow ing may be heard they are not malfunction The reason is that the refrigerant continuously flows into it 9 6 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 approximate 12 V transmitted from indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button AUTO Q 170 247 5 351 541 5 0 SWING f 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 c When standby mode only during multi system operation starts or finishes 4 VANE AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tem perature distribution u Jm e O 1 1 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 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position a When OPERATE STOP ON OFF button is pressed POWER OF
51. the thermostat turns OFF the indoor fan operates very Low to reduce power consumption When the room temperature rises and the thermostat is ON the indoor fan operates according to the settings on the remote controller 12 www ilmal mp pumput com Mitsubishi ilmal mp pumput huoltaa ja korjaa J hdytinpalvelu RefGroup Oy 9 2 DRY OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select DRY mode with OPERATION SELECT button 3 The set temperature is determined from the initial room temperature 1 Coil frost prevention Coil frost prevention is as same as COOL mode 9 1 1 2 Low outside temperature operation Low outside temperature operation is as same as COOL mode 9 1 2 3 Indoor fan speed control Indoor fan speed control is as same as COOL mode 9 1 3 9 3 FAN se OPERATION 1 OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select FAN mode with OPERATION SELECT button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 9 4 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 TEMP or button to select the desired temperature The setting range is 16 31 C 1 Cold air prevention
52. to turn OFF the main unit first with the remote controller and then after confirming the horizontal vane is closed turn OFF the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the P C board 3 When removing the P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires Incorrect Correct MA n Lead wiring Housing point 3 Troubleshooting procedure 1 First check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting serv ice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 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

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