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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-EF18VGW/B/S
MSZ-EF22VGW/B/S
MSZ-EF25VGW/B/S
MSZ-EF35VGW/B/S
MSZ-EF42VGW/B/S
MSZ-EF50VGW/B/S
MSZ-EF∙VGW/VGKW
MSZ-EF∙VGB/VGKB
MSZ-EF∙VGS/VGKS
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E1 ,
E2
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E1 ,
ET1 ,
E2 ,
ET2 ,
ET3
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E1 ,
ET1 ,
E2 ,
ET2 ,
ET3
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E1 ,
ET1 ,
E2 ,
ET2 ,
ET3
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E1 ,
ET1 ,
E2 ,
ET2 ,
ET3
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E1 ,
ET1 ,
E2 ,
ET2 ,
ET3
1
Revision D:
• 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 REVISED EDITION-B is void.
MSZ-EF18VGKW/B/S
MSZ-EF22VGKW/B/S
MSZ-EF25VGKW/B/S
MSZ-EF35VGKW/B/S
MSZ-EF42VGKW/B/S
MSZ-EF50VGKW/B/S
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 ··········· 18
8. SERVICE FUNCTIONS ······························ 19
9. MICROPROCESSOR CONTROL ················ 22
10. TROUBLESHOOTING ······························· 30
11. DISASSEMBLY INSTRUCTIONS ················· 49
PARTS CATALOG (OBB831)
,
ET3
E2
,
ET2
ER2
No. OBH831
REVISED EDITION-D
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E1 ,
E2
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E1 ,
ET1 ,
ER1 ,
E2 ,
ET2 ,
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E1 ,
ET1 ,
ER1 ,
E2 ,
ET2 ,
-
E1 ,
ET1 ,
ER1 ,
E2 ,
ET2 ,
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E1 ,
ET1 ,
ER1 ,
E2 ,
ET2 ,
-
E1 ,
ET1 ,
ER1 ,
E2 ,
ET2 ,
and
ER2
ER2
ER2
ER2
ER2
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Related Manuals for Mitsubishi Electric MSZ-EF18VGW-E1
Summary of Contents for Mitsubishi Electric MSZ-EF18VGW-E1
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Page 1: Table Of Contents
Revision D: • 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 REVISED EDITION-B is void. INDOOR UNIT No. OBH831 SERVICE MANUAL REVISED EDITION-D Models MSZ-EF18VGW/B/S MSZ-EF18VGKW/B/S E1 , E1 , MSZ-EF22VGW/B/S MSZ-EF22VGKW/B/S E1 , ET1 , E2 , ET2 , E1 , ET1 ,... - 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. Revision B: • MSZ-EF22/25/35/42/50VGKW/B/S - have been added. Revision C: • 10. TROUBLESHOOTING has been modified. Revision D: • 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.
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Page 3: Technical Changes
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-EF25VGW MSZ-EF35VGW MSZ-EF18VGW MSZ-EF22VGW MSZ-EF18VGB MSZ-EF22VGB MSZ-EF25VGB MSZ-EF35VGB MSZ-EF18VGS MSZ-EF22VGS MSZ-EF25VGS MSZ-EF35VGS Indoor model MSZ-EF35VGKW MSZ-EF18VGKW MSZ-EF22VGKW MSZ-EF25VGKW MSZ-EF18VGKB MSZ-EF22VGKB MSZ-EF25VGKB MSZ-EF35VGKB MSZ-EF18VGKS MSZ-EF22VGKS MSZ-EF25VGKS MSZ-EF35VGKS Power supply Single phase 230 V, 50 Hz 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 Power supply Single phase 230 V, 50 Hz 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 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-EF35VGW MSZ-EF35VGKW... - Page 8 MSZ-EF42VGW MSZ-EF42VGKW MSZ-EF42VGB MSZ-EF42VGKB MSZ-EF42VGS MSZ-EF42VGKS 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-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 Liquid line... -
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- MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF50VGW- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF50VGB- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF50VGS- PARÇA ADI SİGORTA (T3.15AL250V) REAKTÖR FAN MOTORU DIŞ... - 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-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 ÜNİTEYE VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ İÇ ÜNİTE GÜÇ BORU SICAKLIK KARTI TERMİSTÖRÜ(ANA) BORU SICAKLIK ALICI KARTI TERMİSTÖRÜ(YARDIMCI)
- Page 14 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 15 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...
- Page 16 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 17 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 ALICI KARTI Wİ-Fİ TERMİSTÖRÜ(YARDIMCI) ARAYÜZÜ TERMİNAL BLOĞU İÇ...
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Page 18: 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 19: 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 20 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 21 It shows the indoor unit state. Third party Wi-Fi interfaces cannot be connected to MELCloud. 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 system or product;...
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Page 22: 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 display section... - Page 23 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 24 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 25 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 26 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 27 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 28 (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 29 9-10. EMERGENCY/TEST OPERATION In the case of test run operation or the emergency operation, use the emergency operation switch on the right side of the indoor unit. The 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 30: 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 31 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 32 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 33 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixed in *1 "Test Run operation" means the 1. Check of the unit. the refrigerant circuit. operation within 30 minutes after First, ensure that there are no leakage points on the valves, flare connec- tions, etc.
- Page 34 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 UNIT LED on the Wi-Fi interface blinking? the Wi-Fi interface.
- Page 35 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 36 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 •...
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Page 37: Replace The Indoor Power P.c
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 the emergency operation switch. - Page 38 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. Is LCD display on the remote controller Replace the batteries. (Refer to 10-1.4.) visible? (Not clear) Remove the batteries, then set them back...
- Page 39 C Check of indoor P.C. board and indoor fan motor MSZ-EF∙VG- 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.
- Page 40 MSZ-EF18/22/25/35/42VG- MSZ-EF22/25/35/42VG- MSZ-EF18/22/25/35/42VGK- MSZ-EF22/25/35/42VGK- 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 Short circuit: motor connector CN151 from the indoor motor. Replace the indoor fan motor. electronic control P.C.
- Page 41 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 Short circuit: motor connector CN151 from the indoor motor. Replace the indoor fan motor. electronic control P.C.
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Page 42: Jpg: Msz-Ef·vg- E1 Et1
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 43: Er1 E2 Et2 Er2
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 the emergency operation switch once. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>... - Page 44 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 45 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- Indoor power P.C.
- Page 46 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- Indoor power P.C. board Fuse (F11) Varistor (NR11) Indoor fan motor...
- Page 47 MSZ-EF22VGW- MSZ-EF25VGW- MSZ-EF35VGW- MSZ-EF42VGW- MSZ-EF50VGW- MSZ-EF22VGB- MSZ-EF25VGB- MSZ-EF35VGB- MSZ-EF42VGB- MSZ-EF50VGB- MSZ-EF22VGS- MSZ-EF25VGS- MSZ-EF35VGS- MSZ-EF42VGS- MSZ-EF50VGS- Fuse (F11) Indoor power P.C. board Varistor (NR11) Indoor fan motor (CN211) Connector to terminal 325 V DC block (CN201) (–) GND (high- voltage DC) 15 V DC (+)3-6 V DC (+)0 or 15 V DC...
- Page 48 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) Indoor power P.C. board Varistor (NR11) Indoor fan motor (CN211) Connector to terminal 325 V DC block (CN201) (–) GND (high- voltage DC) 15 V DC (+)3-6 V DC...
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Page 49: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking 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 50 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 51 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 52 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 5 thermistor and the line flow fan Lead wire of 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 53 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 54 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 55 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 56 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the indoor fan motor, the indoor coil Photo 5 thermistor and the line flow fan Lead wire of 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 57 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
- Page 58 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2022. No. OBH831 REVISED EDITION-D Issued: Nov. 2020. No. OBH831 REVISED EDITION-C Issued: Jun. 2020. No. OBH831 REVISED EDITION-B Issued: Jan. 2020. No. OBH831 REVISED EDITION-A Published: Jan.
- Page 59 Related Links Model Number: MSZ-EF18VGK MSZ-EF-VGK DoC (UK2021B45) MSZ-EF18-50VGK MUZ-EF25-50VG Declaration of Conformity MSZ-EF18-50VGK Operation Manual (DG79A04NH01) MSZ-EF18-50VGK Parts List (OBB831C) MSZ-EF18-50VGK Service Manual (OBH831D)