Mitsubishi Electric MSZ-FA25VA Service Manual
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Mitsubishi Electric MSZ-FA25VA Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type
Models
MSZ-FA25VA -
MSZ-FA25VA -
MSZ-FA25VA -
MSZ-FA35VA -
MSZ-FA35VA -
MSZ-FA35VA -
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.
Revision:B
E3
9-2. Failure mode recall function has been
changed.
RoHS PARTS LIST has been added.
Please void OB371 REVISED EDITION-A.
E1
E2
E3
E1
E2
Outdoor unit service manual
E3
MUZ-FA·VA(H) Series (OB372)
MXZ-A·VA Series (OB377)
MXZ-8A140VA
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
model has been added.
No. OB371
REVISED EDITION-B
(OC316)
1

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  • Page 1: Table Of Contents

    RoHS PARTS LIST has been added. Please void OB371 REVISED EDITION-A. INDOOR UNIT No. OB371 SERVICE MANUAL REVISED EDITION-B Wireless type Models MSZ-FA25VA - MSZ-FA25VA - MSZ-FA25VA - MSZ-FA35VA - MSZ-FA35VA - Outdoor unit service manual MSZ-FA35VA - MUZ-FA·VA(H) Series (OB372) MXZ-A·VA Series (OB377)

  • Page 2: Technical Changes

    •9-2. Failure mode recall function has been changed. •RoHS PARTS LIST has been added. TECHNICAL CHANGES MSZ-A09YV - MSZ-FA25VA - MSZ-A12YV - MSZ-FA35VA - 1. Indication of capacity has been changed.(BTU base kW base) 2. Controller method between indoor and outdoor has been changed.

  • Page 3: Part Names And Functions

    MSZ-FA25VA- MSZ-FA25VA- MSZ-FA35VA- MSZ-FA35VA- 1. Color of BOX and CORNER BOX has been changed to white. MSZ-FA25VA- MSZ-FA25VA- MSZ-FA35VA- MSZ-FA35VA- 1. The operation of thermo-off-unit has been changed. (When 2 or more indoor units are connected with a multi type outdoor unit, and operated in heat mode.)

  • Page 4: Remote Controller

    MSZ-FA25VA MSZ-FA35VA Installation plate Installation plate fixing screw 4 o 25 mm ACCESSORIES Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

  • Page 5: Specification

    SPECIFICATION Indoor model MSZ-FA25VA MSZ-FA35VA Function Cooling Cooling Heating Heating Single phase Single phase Power supply 230V,50Hz 230V,50Hz Air flow(Super High) K /h Capacity Air flow(High/Med./Low) K /h 474/354/258 474/354/252 498/384/264 498/384/276 Power outlet Running current 0.25 0.25 Power input...

  • Page 6: Hearing For

    NOISE CRITERIA CURVES MSZ-FA25VA MSZ-FA35VA FAN SPEED FUNCTION SPL(dB(A)) LINE LINE FAN SPEED FUNCTION SPL(dB(A)) COOLING COOLING Super High Super High HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-FA25VA Unit : mm MSZ-FA35VA 11o26 Oblong hole 11o20 Oblong hole Installation plate Indoor unit Air in Wall hole Installation plate Liquid line [6.35 - 0.5m Gas line [9.52 - 0.43m Insulation [35 O.D [19 I.D Drain hose [16 (Connected part O.D)

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MSZ-FA25VA MSZ-FA35VA INDOOR ELECTRONIC CONTROL P.C. BOARD RT13 TAB3 230V~ RT12 DB111 T111 TO OUTDOOR UNIT RT11 12-24V NR11 CONNECTING CN201 LD104 CN211 101(A) 105(T) INTERLOCK SW P.C. PLASMA_A PLASMA_D SWITCH(FAN) BOARD POWER MONITOR SAFETY DEVICE RECEIVER P.C. BOARD...

  • Page 9: Service Functions

    SERVICE FUNCTIONS MSZ-FA25VA MSZ-FA35VA 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) Set time : 1-minute...
  • Page 10 How to release “AUTO RESTART FUNCTION” Turn OFF the main power for the unit. Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 9-7.) JR07 NOTE: • The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller.

  • Page 11: Troubleshooting

    TROUBLESHOOTING MSZ-FA25VA MSZ-FA35VA 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 mis-wiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure 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.
  • Page 12 6. How to remove and install PLASMA DEODORIZING / AIR PURIFYING filter units If PLASMA/WASH lamp on the indoor unit blinks, clean the filters as soon as possible. The lamp will start blinking when accumulated operating time exceeds 330 hours. Figure 1.

  • Page 13: Heating

    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.
  • Page 14 9-2. Failure mode recall function Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur. 1.
  • Page 15 2. Flow chart of PLASMA DEODORIZING/PLASMA AIR PURIFYING power failure mode recall function Operational procedure The plasma unit might be abnormal. Confirm if plasma unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function.
  • Page 16 4. Indoor unit failure mode table Abnormal point Condition Correspondence POWER lamp (Failure mode) Not lighted Normal – – When the room temperature thermistor Room temperature Refer to the characteristics of the room 1-time flash short or open circuit is detected every 8 thermistor temperature thermistor (9-7.).
  • Page 17 9-3. Instruction of troubleshooting w"Test Run operation" If blinking of OPERATION means the operation INDICATOR lamp cannot within 30 minutes after be checked, it can be checked Start EMERGENCY OPERATION with failure mode recall function. switch is pressed. OPERATION Indoor unit Indoor unit Indoor unit operates.

  • Page 18: Troubleshooting Check Table

    9-4. Troubleshooting check table Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following detection method has detected an abnormality (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.
  • Page 19 · Flashing of AREA lamp(left-hand side lamp) indicates abnormality. Lighted Blinking Not lighted Abnormal Operation indicator lamp Symptom Condition Correspondence point Left lamp of AREA lamp flashes. Indoor unit Indoor When it cannot properly read data in the 4-time flash and outdoor •...
  • Page 20 9-5. Trouble criterion of main parts MSZ-FA25VA MSZ-FA35VA Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control Indoor coil thermistor P.C. board", the chart of thermistor.

  • Page 21: Troubleshooting Flow

    9-6. Troubleshooting flow When POWER lamp flashes 3-time. Indoor fan does not operate. Check of indoor fan motor 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.

  • Page 22: Check Of Remote Controller And Receiver P.c. Board

    Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller and receiver P.C. board wCheck if the remote controller is exclusive for this air conditioner. Switch ON the remote controller. Is LCD display on the the remote Replace the batteries.
  • Page 23 The unit does not operate with the remote controller. Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board and indoor fan motor Short/open circuit: Turn OFF the power supply. Measure the resistance of the front panel Replace the front panel driving motor Remove indoor fan motor connector CN211, vane motor driving motor coil.
  • Page 24 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When POWER lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check mis-wiring and serial signal error Turn OFF the power supply.
  • Page 25 When All lamps flash ON and OFF every 0.5-second. Indoor unit and outdoor unit do not operate. Check of installation of the horizontal vane Turn OFF the power supply. Relock the stopper of the Is the stopper of the horizontal vane horizontal vane to the indoor unit.
  • Page 26 When PLASMA/WASH lamp flashes 2-time. When POWER lamp flashes 1 to 5 times while PLASMA DEODORIZING / PLASMA AIR PURIFYING power failure mode is recalled. Check of PLASMA DEODORIZING power After performing the check, make sure to release the failure mode recall function. High voltage (approx.
  • Page 27 When PLASMA/WASH lamp flashes 2-time. When POWER lamp flashes 1 to 5 times while PLASMA DEODORIZING / PLASMA AIR PURIFYING power failure mode is recalled. Check of PLASMA AIR PURIFYING power After performing the check, make sure to release the failure mode recall function. High voltage (approx.
  • Page 28 Indoor unit and outdoor unit do not operate. Check of auto front panel Turn the remote controller ON. Does the front panel automatically open? (Does it start to move?) Is the connectors for the front panel driving motor unit connected? (Motor side or P.C.

  • Page 29: Electromagnetic Noise Enters Into Tv Sets Or Radios

    Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3m, or is the unit, and/or the antennas and distance between the the outdoor unit.
  • Page 30 9-7. Test point diagram and voltage MSZ-FA25VA MSZ-FA35VA Indoor electronic control P.C. board Cement resistance 5V DC 12V DC (R111) Indoor fan motor (CN211) 1311V DC 3(-) Fiducial terminal of cathode side on measur- ing high-voltage DC 415V DC 5(+)3-6V DC...

  • Page 31: Disassembly Instructions

    Locking lever lever. Connector MSZ-FA25VA MSZ-FA35VA OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (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 Front panel the hinges forward to remove the front panel.
  • Page 32 OPERATING PROCEDURE PHOTOS 2. Removing the electronic control P.C. board, the Photo 3 power monitor receiver P.C. board, i-see Sensor, SW P.C. board and the terminal block (1) Remove the horizontal vane, the panel (Refer to 1.) and the corner box. (2) Remove the screw of the V.A.
  • Page 33 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the horizontal vane motor unit (1) Remove the horizontal vane and the panel. (Refer to 1.) Screw of the horizontal (2) Remove the screws of the horizontal vane motor unit, vane motor unit and pull out the horizontal vane motor unit.
  • Page 34 OPERATING PROCEDURE PHOTOS 7. Removing the plasma power P.C. board Photo 11 (1) Remove the horizontal vane, the panel (Refer to 1.) and the corner box. (2) Remove the switch holder and the electrical cover. Screw of the plasma Front panel (Refer to 3.) element holder driving motor...

  • Page 35: Parts List

    PARTS LIST (non-RoHS compliant) MSZ-FA25VA MSZ-FA35VA 11-2. ACCESSORY AND REMOTE 11-1. INDOOR UNIT STRUCTURAL PARTS CONTROLLER 11-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol MSZ-FA25VA- MSZ-FA35VA- in Wiring Remarks Part No. Part name Diagram E02 897 234 E02 A32 234 E02 913 000 PANEL ASSEMBLY Including No.3,4...
  • Page 36 PARTS LIST (non-RoHS compliant) MSZ-FA25VA MSZ-FA35VA 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 11-4. INDOOR UNIT HEAT EXCHANGER...
  • Page 37 PARTS LIST (non-RoHS compliant) 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Q'ty/unit Symbol in Wiring MSZ-FA25VA- MSZ-FA35VA- Part No. Part name Remarks Diagram BEARING MOUNT E02 751 509 E02 001 504 SLEEVE BEARING E02 897 702 DRAIN HOSE E02 913 235 NOZZLE ASSEMBLY UP &...

  • Page 39: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MSZ-FA25VA MSZ-FA35VA 12-2. ACCESSORY AND REMOTE 12-1. INDOOR UNIT STRUCTURAL PARTS CONTROLLER 12-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol MSZ-FA25VA- MSZ-FA35VA- in Wiring Remarks Part No. Part name Diagram E12 A32 234 E12 913 000 PANEL ASSEMBLY Including No.3,4...
  • Page 40 RoHS PARTS LIST (RoHS compliant) MSZ-FA25VA MSZ-FA35VA 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 12-4. INDOOR UNIT HEAT EXCHANGER...
  • Page 41 RoHS PARTS LIST (RoHS compliant) 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Q'ty/unit Symbol in Wiring MSZ-FA25VA- MSZ-FA35VA- Part No. Part name Remarks Diagram BEARING MOUNT E12 751 509 E12 001 504 SLEEVE BEARING E12 897 702 DRAIN HOSE...

  • Page 42: Optional Parts

    (4) Install the deodorizing ceramic filter by following the removal procedure in reverse. Model Part No. MSZ-FA25VA MAC-305FT-E MSZ-FA35VA 13-2. QUICK CLEAN KIT You can sweep the surface of heat exchanger if you install the special-made brush to your vacuum cleaner.
  • Page 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2006. No. OB371 REVISED EDITION-B 6 Distributed in Jan. 2006. No. OB371 REVISED EDITION-A 6 New publication, effective May 2006 Distributed in Jan.

This manual is also suitable for:

Msz-fa35vaMuz-fa-vaMuz-fa-vahMxz-a-vaMxz-8a140va

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