Table of Contents
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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-EF18VGW/B/S
MSZ-EF∙VGW/VGKW
MSZ-EF∙VGB/VGKB
MSZ-EF∙VGS/VGKS
-
MSZ-EF18VGKW/B/S
E1 ,
E2
-
MSZ-EF22VGKW/B/S
ET1 ,
-
MSZ-EF25VGKW/B/S
E1 ,
ET1 ,
E2 ,
ET2
-
MSZ-EF35VGKW/B/S
E1 ,
ET1 ,
E2 ,
ET2
-
MSZ-EF42VGKW/B/S
E1 ,
ET1 ,
E2 ,
ET2
-
MSZ-EF50VGKW/B/S
E1 ,
ET1 ,
E2 ,
ET2
Outdoor unit service manual
MUZ-EF∙VG/H Series (OBH832)
MXZ-F∙VF Series(OBH790)
CONTENTS
1. TECHNICAL CHANGES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 3
2. PART NAMES AND FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 4
3. SPECIFICATION ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 5
4. NOISE CRITERIA CURVES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 7
5. OUTLINES AND DIMENSIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 9
6. WIRING DIAGRAM ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 10
7. REFRIGERANT SYSTEM DIAGRAM ∙∙∙∙∙∙∙∙∙∙∙∙∙ 15
8. SERVICE FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 16
9. MICROPROCESSOR CONTROL ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 19
10. TROUBLESHOOTING ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 27
11. DISASSEMBLY INSTRUCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 44
PARTS CATALOG (OBB831)
1
Revision A:
• MSZ-EF18/22/25/35/42/50VGW/B/S -
MSZ-EF22/25/35/42/50VGW/B/S -
MSZ-EF18/22/25/35/42/50VGKW/B/S -
MSZ-EF22/25/35/42/50VGKW/B/S -
have been added.
OBH831 is void.
No. OBH831
REVISED EDITION-A
,
E2
,
ET2
and
E1
ET1
-
E1
-
E1 ,
ET1
-
E1 ,
ET1
-
E1 ,
ET1
-
E1 ,
ET1
-
E1 ,
ET1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-EF VG Series
Summary of Contents for Mitsubishi Electric MUZ-EF VG Series
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Page 1: Table Of Contents
Revision A: • MSZ-EF18/22/25/35/42/50VGW/B/S - MSZ-EF22/25/35/42/50VGW/B/S - MSZ-EF18/22/25/35/42/50VGKW/B/S - MSZ-EF22/25/35/42/50VGKW/B/S - have been added. OBH831 is void. INDOOR UNIT No. OBH831 SERVICE MANUAL REVISED EDITION-A Models MSZ-EF18VGW/B/S MSZ-EF18VGKW/B/S E1 , MSZ-EF22VGW/B/S MSZ-EF22VGKW/B/S E1 , ET1 , E2 , E1 , MSZ-EF25VGW/B/S MSZ-EF25VGKW/B/S E1 ,... - Page 2 Revision A: • MSZ-EF18/22/25/35/42/50VGW/B/S - , MSZ-EF22/25/35/42/50VGW/B/S - MSZ-EF18/22/25/35/42/50VGKW/B/S - and MSZ-EF22/25/35/42/50VGKW/B/S - have been added. Use the specified 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.
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Page 3: Msz-Ef22Vgw/B/S
TECHNICAL CHANGES The following models are compatible with the outdoor units with low standby power control. Connecting the following models to the MUZ-EF∙VG/H series outdoor units enables the low standby power control. The following models may be connected to the MUZ-EF∙VG/H series after once connected to the MXZ series and operated, for example because of relocation. -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS Front panel Air fi... -
Page 5: Specification
SPECIFICATION MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS Indoor model MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF35VGKB MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS Single phase 230 V, 50 Hz Power supply Cooling Power input Heating Cooling 0.20 Running current... - Page 6 MSZ-EF42VGW MSZ-EF50VGW MSZ-EF42VGB MSZ-EF50VGB MSZ-EF42VGS MSZ-EF50VGS Indoor model MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF42VGKS MSZ-EF50VGKS Single phase 230 V, 50 Hz Power supply Cooling Power input Heating Cooling 0.23 0.23 Running current Heating 0.31 0.39 Model RC0J40 Cooling 0.23 0.23 Current Heating 0.31 0.39...
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Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING Super High HEATING NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 NC-10 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MSZ-EF35VGW MSZ-EF35VGKW... - Page 8 MSZ-EF42VGW MSZ-EF42VGKW MSZ-EF42VGB MSZ-EF42VGKB MSZ-EF42VGS MSZ-EF42VGKS FUNCTION SPL(dB(A)) FAN SPEED LINE COOLING Super High HEATING NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 NC-10 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MSZ-EF50VGW MSZ-EF50VGKW MSZ-EF50VGB MSZ-EF50VGKB MSZ-EF50VGS MSZ-EF50VGKS FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING Super High...
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Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS Unit: mm Insulation ø37 O.D ø6.35 - 0.5 m (Flared connection ø6.35) -
Page 10: Wiring Diagram
WIRING DIAGRAM MSZ-EF18VGW- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF50VGW- MSZ-EF18VGB- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF50VGB- MSZ-EF18VGS- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF50VGS-... - Page 11 MSZ-EF18VGW- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF18VGB- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF18VGS- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY ÜST) KANAT MOTORU (YATAY ALT) DIŞ...
- Page 12 MSZ-EF50VGW- MSZ-EF50VGB- MSZ-EF50VGS- MSZ-EF50VGW- MSZ-EF50VGB- MSZ-EF50VGS- SİGORTA (T3.15AL250V) REAKTÖR FAN MOTORU KANAT MOTORU (YATAY ÜST) KANAT MOTORU DIŞ ÜNİTEYE (YATAY ALT) VARİSTÖR ODA SICAKLIK TERMİSTÖRÜ İÇ ÜNİTE GÜÇ KARTI BORU SICAKLIK TERMİSTÖRÜ(ANA) BORU SICAKLIK TERMİSTÖRÜ(YARDIMCI) ALICI KARTI TERMİNAL BLOĞU İÇ ÜNİTE ELEKTRONİK RÖLE KONTROL KARTI NOTLAR...
- Page 13 MSZ-EF18VGKW- MSZ-EF22VGKW- MSZ-EF25VGKW- MSZ-EF35VGKW- MSZ-EF42VGKW- MSZ-EF18VGKB- MSZ-EF22VGKB- MSZ-EF25VGKB- MSZ-EF35VGKB- MSZ-EF42VGKB- MSZ-EF18VGKS- MSZ-EF22VGKS- MSZ-EF25VGKS- MSZ-EF35VGKS- MSZ-EF42VGKS- MSZ-EF22VGKW- MSZ-EF25VGKW- MSZ-EF35VGKW- MSZ-EF42VGKW- MSZ-EF22VGKB- MSZ-EF25VGKB- MSZ-EF35VGKB- MSZ-EF42VGKB- MSZ-EF22VGKS- MSZ-EF25VGKS- MSZ-EF35VGKS- MSZ-EF42VGKS- PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY ÜST) KANAT MOTORU (YATAY ALT) DIŞ...
- Page 14 MSZ-EF50VGKW- MSZ-EF50VGKB- MSZ-EF50VGKS- MSZ-EF50VGKW- MSZ-EF50VGKB- MSZ-EF50VGKS- SİGORTA (T3.15AL250V) REAKTÖR FAN MOTORU KANAT MOTORU (YATAY ÜST) KANAT MOTORU DIŞ ÜNİTEYE (YATAY ALT) VARİSTÖR ODA SICAKLIK TERMİSTÖRÜ İÇ ÜNİTE GÜÇ KARTI BORU SICAKLIK TERMİSTÖRÜ(ANA) BORU SICAKLIK Wİ-Fİ TERMİSTÖRÜ(YARDIMCI) ALICI KARTI ARAYÜZÜ TERMİNAL BLOĞU İÇ...
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Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS Unit: mm Refrigerant pipe ø9.52 (with heat insulator) Indoor coil... -
Page 16: Service Functions
SERVICE FUNCTIONS MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS/the timer short mode point* on the elec- tronic control P.C. - Page 17 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 electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.
- Page 18 Third party Wi-Fi interfaces cannot be connected to MELCloud. MODE switch It selects modes. Mitsubishi Electric is not responsible for any (i) under performance of a sys- tem or any product; (ii) system or product fault; or (iii) loss or damage to any RESET switch It resets the system and ALL settings.
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Page 19: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS WIRELESS REMOTE CONTROLLER Signal transmitting section FAN SPEED CONTROL button OPERATION SELECT button... - Page 20 9-1. COOL ( ) OPERATION (1) Press / STOP/OPERATE (OFF/ON) 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.
- Page 21 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: • If the room temperature is higher than the set temperature, operation starts in COOL mode. •...
- Page 22 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 (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
- Page 23 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 SET button. How to set the current time (a) Press the CLOCK set button.
- Page 24 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 •...
- Page 25 (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.
- Page 26 9-10. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or the batteries in the remote controller are running down.
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Page 27: Troubleshooting
TROUBLESHOOTING MSZ-EF18VGW MSZ-EF22VGW MSZ-EF25VGW MSZ-EF35VGW MSZ-EF42VGW MSZ-EF50VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF42VGB MSZ-EF50VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS MSZ-EF42VGS MSZ-EF50VGS MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS 10-1. CAUTIONS ON TROUBLESHOOTING 1. - Page 28 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.
- Page 29 2. Table of indoor unit failure mode recall function The left lamp of Abnormal point OPERATION INDI- Condition Remedy (Failure mode) CATOR lamp Not lit Normal — — The room temperature thermistor short or 1-time blink every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
- Page 30 10-3. INSTRUCTION OF TROUBLESHOOTING 1. Check of the unit. Start Indoor unit operates. Indoor unit operates. Indoor unit does OPERATION INDICATOR Outdoor unit does Outdoor unit does not receive the lamp on the indoor unit is not operate. not operate normally. signal from re- blinking ON and OFF.
- Page 31 2. Check of Wi-Fi interface (MSZ-EF∙VGKW/B/S) Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Start There is a problem in communication between the air conditioner and Is the UNIT lamp on the Wi-Fi interface blinking? the Wi-Fi interface.
- Page 32 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 blinks. OPERATION INDICATOR Blinking Not lit...
- Page 33 OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and lower lamp blinks. The operation mode of the each indoor unit MXZ type Outdoor unit is differently set to COOL (includes DRY) and •...
- Page 34 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.
- Page 35 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) button on the remote controller. 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone.
- Page 36 C Check of indoor P.C. board and indoor fan motor MSZ-EF ∙ 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 motor connector CN151 from the indoor Short circuit: motor.
- Page 37 MSZ-EF18/22/25/35/42VG- MSZ-EF18/22/25/35/42VGK- 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 motor connector CN151 from the indoor Short circuit: motor. Replace the indoor fan motor. electronic control P.C.
- Page 38 MSZ-EF50VG- MSZ-EF50VGK- 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 motor connector CN151 from the indoor Short circuit: motor. Replace the indoor fan motor. electronic control P.C.
- Page 39 D How to check miswiring and serial signal error MUZ-EF Type Turn the main 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...
- Page 40 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 left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>...
- Page 41 E 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.
- Page 42 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board, indoor power P.C. board, receiver P.C. board and display P.C. board MSZ-EF18VGW- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF50VGW- MSZ-EF18VGB- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF50VGB- MSZ-EF18VGS- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF50VGS- Fuse (F11) Varistor (NR11)
- Page 43 MSZ-EF18VGW- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF50VGW- MSZ-EF18VGB- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF50VGB- MSZ-EF18VGS- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF50VGS- MSZ-EF18VGKW- MSZ-EF22VGKW- MSZ-EF25VGKW- MSZ-EF35VGKW- MSZ-EF42VGKW- MSZ-EF50VGKW- MSZ-EF18VGKB- MSZ-EF22VGKB- MSZ-EF25VGKB- MSZ-EF35VGKB- MSZ-EF42VGKB- MSZ-EF50VGKB- MSZ-EF18VGKS- MSZ-EF22VGKS- MSZ-EF25VGKS- MSZ-EF35VGKS- MSZ-EF42VGKS- MSZ-EF50VGKS- Fuse (F11) Varistor (NR11) Indoor fan motor Indoor power P.C.
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Page 44: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with lockig mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminals with locking mechanisms. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 45 OPERATING PROCEDURE PHOTOS/FIGURES 2. Remove the indoor electrical box Photo 2 Electrical box Earth wire (1) Remove the panel (Refer to section 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.
- Page 46 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to section 1.) and the corner box right. (2) Remove the indoor/outdoor connecting wire (Refer to section 2.). (3) Remove the electrical cover (Refer to section 2.). (4) Disconnect the following connector: <Indoor electronic control P.C.
- Page 47 OPERATING PROCEDURE PHOTOS/FIGURES 6. 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 section 1.) and the corner box right. (2) Remove the indoor electronic control P.C.
- Page 48 11-2. MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF35VGKW MSZ-EF42VGKW MSZ-EF50VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF42VGKB MSZ-EF50VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS MSZ-EF42VGKS MSZ-EF50VGKS : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1.
- Page 49 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the Wi-Fi interface Photo 2 Wi-Fi interface Electrical box (1) Remove the panel (Refer to section 1.) and the corner Earth wire box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire.
- Page 50 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the nozzle assembly Photo 4 (1) Remove the panel (Refer to section 1.) and the corner box right. (2) Remove the indoor/outdoor connecting wire (Refer to section 3.). (3) Remove the electrical cover (Refer to section 3.). (4) Disconnect the following connector: <Indoor electronic control P.C.
- Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 7. 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 section 1.) and the corner box right. (2) Remove the indoor electronic control P.C.
- Page 52 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Jan. 2020. No. OBH831 REVISED EDITION-A Published: Jan. 2019. No. OBH831 Made in Japan Specifications are subject to change without notice.