Revision D: • MSZ-FH25VE2- , MSZ- FH35VE2- and MSZ- FH50VE2- have been added. Please void OBH623 REVISED EDITION-C. INDOOR UNIT No. OBH623 SERVICE MANUAL REVISED EDITION-D Models MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 Outdoor unit service manual Outdoor unit service manual MUZ-FH·VEHZ Series (OBH625) MUZ-FH·VE Series (OBH624) MSZ-FH50VE2...
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Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
TECHNICAL CHANGES These models are compatible with the outdoor units with low standby power control. Connecting these models to the MUZ-FH·VE(HZ)-series outdoor units enables the low standby power control. Refer to the technical guide (OBT17) about the low standby power control. These models may be connected to the MUZ-FH·VE(HZ) series after once connected to the MXZ series and operated, for example because of relocation.
SPECIFICATION Indoor model MSZ-FH25VE MSZ-FH25VE2 MSZ-FH35VE MSZ-FH35VE2 MSZ-FH50VE MSZ-FH50VE2 Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.28 0.29 Running current Heating 0.28 0.29 Model RC0J30-MD Cooling 0.28 0.29 Current Heating 0.28 0.29 Dimensions W × H × D 925 ×...
NOISE CRITERIA CURVE MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 MSZ-FH50VE2 FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000...
SERVICE FUNCTIONS MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 MSZ-FH50VE2 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by bridging JPG and JPS.) 8-2.
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8-4. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.
MICROPROCESSOR CONTROL MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 MSZ-FH50VE2 WIRELESS REMOTE CONTROLLER MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from the indoor unit when the signal is received. FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button WIDE VANE button...
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9-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) (MSZ-FH25/35/50VE)/STOP/OPERATE (OFF/ON) (MSZ-FH25/35/50VE2) 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 button to select the desired temperature. The setting range is 16 - 31°C. 1.
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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 (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”.
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(7) SWING ( ) 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.
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9-7. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK button. How to set the current time (a) Press the CLOCK button.
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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. NOTE: The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the •...
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(4) Press button to complete and transmit the weekly timer setting. which was blink- ing goes out, and the current time will be displayed. 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.
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9-11. NATURAL FLOW ( ) OPERATION In NATURAL FLOW operation, air fl ow will become more like natural wind. An occupant will not be directly exposed to the air fl ow and feel more comfortable. (1) Press NATURAL FLOW button during COOL or FAN mode to start NATURAL FLOW operation. (2) Press NATURAL FLOW button again to cancel NATURAL FLOW operation.
TROUBLESHOOTING MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 MSZ-FH50VE2 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 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.
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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.
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2. Flow chart of AIR PURIFYING power failure mode recall function Operational procedure The air purifying device might be abnormal. Check if the air purifying device is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function.
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4. Indoor unit failure mode table Abnormal point POWER lamp Condition Remedy (Failure mode) Not lighted Normal — — The room temperature thermistor short or 1-time fl ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor thermistor (10-7.).
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10-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means the If blinking of OPERATION INDI- operation within 30 minutes af- CATOR lamp cannot be checked, Start ter EMERGENCY OPERATION it can be checked with failure switch is pressed. mode recall function. Indoor unit operates.
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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. •...
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OPERATION INDICATOR Lighted Blinking Not lighted (POWER) (AIR PURIFYING) Abnormal Operation indicator lamp Symptom Condition Remedy point • AIR PURIFYING lamp fl ash. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY, FAN) •...
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10-6. TROUBLESHOOTING 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. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
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B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) (MSZ-FH25/35/50VE)/STOP/ OPERATE (OFF/ON) (MSZ- FH25/35/50VE2) button on the 1 Look at the image of the signal transmitting section of remote controller.
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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 Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
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D How to check miswiring and serial signal error MUZ-25/35 Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored...
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MUZ-FH50 Turn the power supply OFF. NOTE: Refer to the outdoor unit service manual. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi •...
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MXZ Type Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the indoor POWER lamp light up? <Confi...
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Turn ON the power supply. LED indication for communication status Communication status is indicated by the LED. Is there rated voltage Check the power supply Unit status between outdoor Blinking: Normal communication and correct the problem. terminal block S1 and S2 ? Lighted: Abnormal communication or not connected Not lighted: The outdoor P.C.
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When AIR PURIFYING lamp flashes 2-time. When POWER lamp flashes 1 to 5 times while AIR PURIFYING power failure mode is recalled. E Check of AIR PURIFYING power After performing the check, make sure to release the failure mode recall function. High voltage (approximately 5.8kV) is generated during AIR PURIFYING power operation.
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F Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
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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-FH25VE MSZ-FH35VE MSZ-FH50VE MSZ-FH25VE2 MSZ-FH35VE2 MSZ-FH50VE2 Connector Terminal Varistor (NR11) Fuse (F11) Indoor fan motor Indoor power P.C. board Block (CN201) (CN211) (+)0 or 15 VDC...
DISASSEMBLY INSTRUCTIONS DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 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.
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OPERATING PROCEDURE PHOTOS 2. Removing the indoor electrical box Photo 3 Earth wire (1) Remove the panels (Refer to 1.) and the right corner Electrical box box. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire.
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OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 7 (1) Remove the panels (Refer to 1.) and the right corner Screw of the vertical box. vane motor unit (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.
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OPERATING PROCEDURE PHOTOS 7. Removing the air purifying device Photo 9 Lead wire of the indoor (1) Remove the panels (Refer to 1.) and the right corner coil thermistor box. Water cut (2) Remove the air purifying device. (3) Remove the electrical box (Refer to 2.). (4) Remove the lead wire from the water cut.