Mitsubishi Electric MSZ-FA25VA Service Manual Download

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CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES ·······························6

5. OUTLINES AND DIMENSIONS ·························7

6. WIRING DIAGRAM ············································8

7. REFRIGERANT SYSTEM DIAGRAM ················8

8. SERVICE FUNCTIONS ······································9

9. TROUBLESHOOTING······································11

10. DISASSEMBLY INSTRUCTIONS·····················31

11. PARTS LIST······················································35

12. RoHS PARTS LIST···········································39

13. OPTIONAL PARTS···········································42

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

NOTE:
This service manual describes technical data of the indoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.

SERVICE MANUAL

Wireless type
Models

MSZ-FA25VA -
MSZ-FA25VA -
MSZ-FA25VA -
MSZ-FA35VA -
MSZ-FA35VA -
MSZ-FA35VA -

No. OB371

REVISED EDITION-B

INDOOR UNIT

Outdoor unit service manual
MUZ-FA·VA(H) Series (OB372)
MXZ-A·VA Series (OB377)
MXZ-8A140VA

(OC316)

Revision:B

●

model has been added.

●

9-2. Failure mode recall function has been

changed.

●

RoHS PARTS LIST has been added.

Please void OB371 REVISED EDITION-A.

OB371B--1qxp 06.5.10 2:00 PM Page 1

Summary of Contents for MSZ-FA25VA

Page 1: ...cal data of the indoor units RoHS compliant products have G mark on the spec name plate For servicing of RoHS compliant products refer to the RoHS Parts List SERVICE MANUAL Wireless type Models MSZ FA25VA MSZ FA25VA MSZ FA25VA MSZ FA35VA MSZ FA35VA MSZ FA35VA E3 E2 E1 E3 E2 E1 No OB371 REVISED EDITION B INDOOR UNIT Outdoor unit service manual MUZ FA VA H Series OB372 MXZ A VA Series OB377 MXZ 8A14...

Page 2: ...ical vane motor unit has been added An external gear is added to the generalized stepping motor The unit is structured so that the driving torque and stopping torque would increase Generalized stepping motor NOTE Do not remove the vane motor from the motor unit Do not disassemble the vertical vane motor unit 1 Indication of capacity has been changed BTU base kW base 2 Controller method between ind...

Page 3: ...low direction changes automatically according to the detection of i see Sensor which detects the floor wall temperature to air condition the room evenly i see control operation i see sensor constantly measure floor wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room sensible temperature Open Closed Auto front ...

Page 4: ...RWARD button BACKWARD button VANE CONTROL button Horizontal vane button OFF TIMER button i see button This diagram shows an overall view Open the front lid PLASMA button AREA button RESET button WIDE VANE button Vertical vane button Signal transmitting section Operation display section Temperature buttons OPERATE STOP ON OFF button FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button...

Page 5: ... factor 1 Fan motor current 1 Model Dimensions WOHOD Weight Air direction Sound level Super High Sound level High Med Low Fan speed Super High Fan speed High Med Low Fan speed regulator Remote controller model K h K h A A W A mm kg dB A dB A rpm rpm Electrical data Fan motor Special remarks Capacity MSZ FA25VA MSZ FA35VA Indoor model Function Cooling 546 450 348 252 1 130 960 790 610 Heating 540 4...

Page 6: ...perature 19 Heating Dry bulb temperature 20 Wet bulb temperature 15 INDOORUNIT WALL MICROPHONE 0 8m 1m 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 APPROXIMATE THRESHOLD OF HEARING FOR CONTINU...

Page 7: ...oor unit Installation plate Installation plate 11o20 Oblong hole 11o26 Oblong hole 10 or more 75 or more 55 or morew 75 or more wIn case of left left back or left under piping using spacer 113 or more Insulation 28 Drain hose 16 Connected part O D Liquid line 6 35 0 5m Gas line 9 52 0 43m Insulation 35 O D 19 I D Required space Indoor unit Wireless remote controller MSZ FA35VA OB371B 1qxp 06 5 10 ...

Page 8: ...OR i see Sensor MOTOR VANE MOTOR HORIZONTAL NAME VANE MOTOR VERTICAL VARISTOR PLASMAAIR PURIFYING FILTER UNIT PLASMA DEODORIZING FILTER UNIT i see Sensor ROOM TEMPERATURE THERMISTOR NAME INDOOR COIL THERMISTOR MAIN INDOOR COIL THERMISTOR SUB TRANSFORMER TERMINAL BLOCK NOTE 1 About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing 2 Use copper conducto...

Page 9: ...troller for the indoor unit The indoor unit only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set The setting will be cancelled if the breaker has turned OFF or the power supply has shut down Please conduct the above setting once again after the power has restored How to modify the remote controller P C board Remove batteries before modifica...

Page 10: ...y adding to the system that allows the units to start one by one How to release AUTO RESTART FUNCTION 1Turn OFF the main power for the unit 2Solder the Jumper wire to JR07 on the indoor electronic control P C board Refer to 9 7 JR07 CN151 CN211 CN112 CN1R1 CN212 CN1T1 CN1T2 CN130 IC156 8 4 Remote controller Be sure to set the slide switch inside the remote controller to an appropriate position in ...

Page 11: ...r plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electronic control 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 Housing point Lead wirin...

Page 12: ...oes not close if PLASMA DEODORIZING AIR PURIFYING filter units are not installed properly 3 Install the anti mold air filter 4 Connect the power supply plug and or turn ON the breaker 5 Press WASH reset switch A short beep is heard and the blinks of PLASMA WASH lamp will be cancelled Make sure PLASMA WASH lamp is not blinking at the start of operation next time See Figure 4 6 Hold both sides of th...

Page 13: ...her for heating the operation mode of the indoor unit that operates earlier is selected The other indoor units which 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 When indoor units start the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 minutes to ...

Page 14: ...Check the blinking pattern and confirm the abnormal point with the indoor unit failure mode table 9 2 4 Make sure to check at least two consecutive blinking cycles W2 Turn ON the power supply Preparation of the remote controller 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button 2 First release RESET button And release the...

Page 15: ... cycle Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps 1After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above 2Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed to...

Page 16: ...ffer from the ones of Troubleshooting check table 9 4 NOTE1 Blinking patterns of this mode differ from the ones of Troubleshooting check table 9 4 NOTE2 As soon as an abnormality is detected PLASMA DEODORIZING power and or PLASMA AIR PURIFYING power goes OFF therefore measuring instrument which records the voltage wave is required in order to perform the above mentioned voltage measurement 12 time...

Page 17: ...lash Cause Outdoor unit Outdoor power system abnormality POWER lamp 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit POWER lamp 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 9 6 D How to check of mis wiring and serial signal error All lamps Flash on and off at 0 5 second intervals Cause Indoor unit The horizontal vane is not installed correctly Ref...

Page 18: ... 3 time flash 2 5 second OFF When the rotational frequency feedback signal is not emit during the indoor fan operation Refer to 9 6 A Check of indoor fan motor Indoor unit and outdoor unit do not operate POWER lamp flashes 5 time flash 2 5 second OFF POWER lamp flashes 6 time flash 2 5 second OFF Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not operate Indoor unit an...

Page 19: ...n Correspondence Abnormal point 1 MXZ type Operation mode setting Outdoor unit operates but indoor unit does not operate When the operation mode of the each indoor unit is differently set to COOL includes DRY and HEAT at the same time the operation mode of the indoor unit that has operated at first has the priority Unify the operation mode Refer to outdoor unit service manual 2 5 second OFF Both l...

Page 20: ... terminals with a tester Part temperature 10 C 30 C 94 102 i see Sensor RR Turn the power ON i see Sensor is energized with the aluminum block part on the i see Sensor P C board upper part of i see Sensor covered with black vinyl tape then measure the voltage between connector terminals of i see Sensor using tester Part temperature 10 40 C 282 306 Normal range 2 4 1 2 1 874 3 387V DC 1 010 1 420V ...

Page 21: ...PERATION switch is pressed If more than 12 seconds passes by turn OFF the power supply and turn ON it again then measure the voltage w 1 Measure the voltage between CN211 1 and 3 2 Measure the voltage between CN211 5 and 3 Is there 325V DC between CN211 1 and 3 and does the voltage between CN211 5 and 3 rise to the range of 3 to 6V DC within 12 seconds after EMERGENCY OPERATION switch is pressed Y...

Page 22: ...there any fluorescent lights of inverter or rapid start type within the range of 1m Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving part Switch ON the remote controller Is LCD display on the the remote controller visible Remove the batteries then set them back and press RESET button Refer to 9 1 4 Check if the unit operates with the remote controller ...

Page 23: ...ne motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 Are the varistor NR11 burnt and the fuse F11 blown Be sure to check both the fuse and the varistor in any case No Yes No Is the fuse F11 blown only Yes No Is the resistance 1M or more Measure...

Page 24: ...ove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20V DC between outdoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board Replace the inverter P C board or the outdoor electronic control ...

Page 25: ...f the horizontal vane to the indoor unit Refer to 9 1 5 Yes Are all lamps flashing Yes No No OK Turn ON the power supply To check the continuity of the interlock switch Fan measure the resistance of connector 1 2 connected to CN1R1 on the indoor electronic control P C board Turn OFF the power supply Turn OFF the power supply When All lamps flash ON and OFF every 0 5 second Indoor unit and outdoor ...

Page 26: ... DC is generated Yes No Replace the indoor electronic control P C board after check of the wiring of CN1T1 on the indoor electronic control P C board High voltage approx 3 9kV is generated during PLASMA DEODORIZING power operation Pay careful attention and never touch PLASMA unit and the high voltage lead part red wire Yes No OFF PLASMA DEODORIZING operation Continuously blinking OFF Continuously ...

Page 27: ... DC is generated Yes No Replace the indoor electronic control P C board after check of the wiring of CN1T1 on the indoor electronic control P C board High voltage approx 3 9kV is generated during PLASMA AIR PURIFYING power operation Pay careful attention and never touch PLASMA unit and the high voltage lead part red wire Yes No OFF Continuously blinking OFF Continuously blinking Does PLASMA WASH l...

Page 28: ...ont panel held 10mm or more upper than the level line of the nozzle top Yes No Turn the remote controller ON Connect the connector and check from the start again Is the resistance between terminals of the front panel driving motor unit normal Refer to 9 5 Replace the indoor electric control P C board Replace the front panel driving motor unit Yes No No Yes No Indoor unit and outdoor unit do not op...

Page 29: ...ditioner 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 in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check f...

Page 30: ...ard i see Sensor CN110 Fuse F11 Front panel driving motor CN1U1 Safety device Plasma unit CN1T2 Plasma deodorizing air purifying filter units CN1T1 CN2011 Used for check of con ducting of thermal fuse Interlock switch Fan CN1R1 6 0V DC or 15V DC 5 3 6V DC 415V DC 3 Fiducial terminal of cathode side on measur ing high voltage DC 1311V DC Cement resistance R111 Indoor fan motor CN211 1DC 2 5V during...

Page 31: ...ching Terminal with locking mechanism Detaching points Connector Sleeve Locking lever MSZ FA25VA MSZ FA35VA OPERATING PROCEDURE PHOTOS Photo 1 1 Removing the panel 1 Press and unlock the knobs on both sides of the front panel and lift the front panel until it is level and then pull the hinges forward to remove the front panel 2 Remove the horizontal vane 3 Remove the screw caps of the panel Remove...

Page 32: ...cal box and pull out the electrical box 15 Remove the screws of the terminal block cover and then the terminal block cover and the terminal block holder See Photo 3 16 Remove the terminal block by sliding it OPERATING PROCEDURE PHOTOS Screw of the electrical cover Switch holder Photo 4 3 Removing the electrical box 1 Remove the horizontal vane the panel Refer to 1 and the corner box 2 Remove the s...

Page 33: ...ector from the horizontal vane motor unit Photo 6 Screw of the horizontal vane motor unit 6 Removing the indoor fan motor and the line flow fan 1 Remove the horizontal vane the panel Refer to 1 and the corner box 2 Remove the switch holder and the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Remove the screws fixing the motor bed See...

Page 34: ...plasma element holder from the heat exchanger See Photo 11 6 Unhook all the catches of plasma unit cover and remove the plasma unit cover See Photo 12 7 Remove the terminals with locking mechanism connected to the plasma power P C board and the safety device Plasma unit See Photo 13 8 Remove the plasma electrical box from the plasma element holder 9 Remove the screw fixing the plasma electrical bo...

Page 35: ...IR FILTER RIGHT CORNER BOX RIGHT CORNER BOX RIGHT INSTALLATION PLATE Including No 3 4 2PCS SET E2 MSZ FA35VA E1 E2 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 E02 897 234 E02 A32 234 E02 913 000 E02 913 067 E02 913 010 E02 914 100 E02 913 100 E02 913 975 E02 A32 975 E02 913 970 1 1 1 1 1 1 1 1 E02 913 426 E02 527 083 11 1 INDOOR UNIT STRUCTURAL PARTS 11 2 ACCESSORY AND REMOTE C...

Page 36: ...D FUNCTIONAL PARTS MSZ FA25VA MSZ FA35VA 4 5 3 9 1 6 33 11 4 INDOOR UNIT HEAT EXCHANGER 10 8 7 18 11 12 13 14 15 16 17 18 19 18 21 24 20 23 22 25 26 27 28 29 31 30 2 35 34 32 PARTS LIST non RoHS compliant OB371B 2qxp 06 5 10 2 03 PM Page 36 ...

Page 37: ...19 20 21 22 23 24 25 26 27 28 29 30 31 32 MSZ FA25VA E1 E2 MSZ FA35VA E1 E2 33 34 35 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION LIQUID 9 52 6 35 E02 751 509 E02 001 504 E02 897 702 E02 913 235 E02 897 303 E02 897 316 E02 913 303 E02 913 040 E02 A49 382 E02 661 385 E02 913 095 E02 913 391 E02 914 303 E02 897 784 E02 897 780 E02 897 779 E02 913 375 E02 913 452 E02 914 452 E02 897 30...

Page 38: ...38 OB371B 2qxp 06 5 10 2 03 PM Page 38 ...

Page 39: ...ONT PANEL AIR FILTER LEFT AIR FILTER RIGHT CORNER BOX RIGHT INSTALLATION PLATE Including No 3 4 2PCS SET E3 MSZ FA35VA E2 E3 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 E12 A32 234 E12 913 000 E12 913 067 E12 913 010 E12 914 100 E12 913 100 E12 A32 975 E12 913 970 1 1 1 1 1 1 1 1 E12 913 426 E12 527 083 RoHS 12 1 INDOOR UNIT STRUCTURAL PARTS 12 2 ACCESSORY AND REMOTE CONTROLLER...

Page 40: ...D FUNCTIONAL PARTS MSZ FA25VA MSZ FA35VA 4 5 3 9 1 6 33 12 4 INDOOR UNIT HEAT EXCHANGER 10 8 7 18 11 12 13 14 15 16 17 18 19 18 21 24 20 23 22 25 26 27 28 29 31 30 2 35 34 32 RoHS PARTS LIST RoHS compliant OB371B 2qxp 06 5 10 2 03 PM Page 40 ...

Page 41: ...2 23 24 25 26 27 28 29 30 31 32 G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G MSZ FA25VA E2 E3 MSZ FA35VA E2 E3 33 34 35 G G G G INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION LIQUID 9 52 6 35 E12 751 509 E12 001 504 E12 897 702 E12 913 235 E12 897 303 E12 897 316 E12 913 303 E12 913 040 E12 A49 382 E12 661 385 E12 913 095 E12 913 391 E12 914 303 E12 897 784 ...

Page 42: ...filter 1 Release the two knobs to open the filter unit 2 Pull the side knobs to outward and then forward to remove as illustrated below 3 Pull out the deodorizing ceramic filter from the side of the filter unit 4 Install the deodorizing ceramic filter by following the removal procedure in reverse 1 2 Deodorizing ceramic filter MAC 305FT E Model Part No MSZ FA25VA MSZ FA35VA MAC 093SS E Model Part ...

Page 43: ...43 OB371B 2qxp 06 5 10 2 03 PM Page 43 ...

Page 44: ... ELECTRIC ENGINEERING CO LTD Distributed in May 2006 No OB371 REVISED EDITION B 6 Distributed in Jan 2006 No OB371 REVISED EDITION A 6 Distributed in Jan 2005 No OB371 6 Made in Japan New publication effective May 2006 Specifications subject to change without notice OB371B 2qxp 06 5 10 2 03 PM Page 44 ...

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