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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-LN18VGW/V/B/R
MSZ-LN18VG2W
MSZ-LN18VG2V/B/R
MSZ-LN25VGW/V/B/R
MSZ-LN25VG2W/V/B/R
MSZ-LN35VGW/V/B/R
MSZ-LN35VG2W/V/B/R
MSZ-LN50VGW/V/B/R
MSZ-LN50VG2W/V/B/R
MSZ-LN60VGW/V/B/R
MSZ-LN60VG2W/V/B/R
MSZ-LN25VGW/V/B/R
MSZ-LN35VGW/V/B/R
MSZ-LN50VGW/V/B/R
MSZ-LN60VGW/V/B/R
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CONTENTS
10. TROUBLESHOOTING ······························· 37
11. DISASSEMBLY INSTRUCTIONS ················· 55
PARTS CATALOG (OBB766)
Revision G:
• MSZ-LN18VG2W -
SC1
MSZ-LN18VG2V/B/R -
MSZ-LN25/35/50VG2W/V/B/R -
and MSZ-LN60VG2W/V/B/R -
have been added.
OBH766 REVISED EDITION-F is void.
REVISED EDITION-G
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Outdoor unit service manual
MUZ-LN•VG Series (OBH767)
MUZ-LN•VGHZ Series (OBH768)
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················5
3. SPECIFICATION ········································6
4. NOISE CRITERIA CURVE ····························8
5. OUTLINES AND DIMENSIONS ··················· 11
6. WIRING DIAGRAM ··································· 13
7. REFRIGERANT SYSTEM DIAGRAM ··········· 18
8. SERVICE FUNCTIONS ······························ 19
9. MICROPROCESSOR CONTROL ················· 26
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Table of Contents
Related Manuals for Mitsubishi Electric MSZ-LN18VG2W-SC1
Summary of Contents for Mitsubishi Electric MSZ-LN18VG2W-SC1
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Page 1: Table Of Contents
Revision G: • MSZ-LN18VG2W - MSZ-LN18VG2V/B/R - MSZ-LN25/35/50VG2W/V/B/R - and MSZ-LN60VG2W/V/B/R - have been added. OBH766 REVISED EDITION-F is void. INDOOR UNIT No. OBH766 SERVICE MANUAL REVISED EDITION-G Models MSZ-LN18VGW/V/B/R MSZ-LN18VG2W MSZ-LN18VG2V/B/R MSZ-LN25VGW/V/B/R MSZ-LN25VG2W/V/B/R MSZ-LN35VGW/V/B/R MSZ-LN35VG2W/V/B/R MSZ-LN50VGW/V/B/R MSZ-LN50VG2W/V/B/R MSZ-LN60VGW/V/B/R MSZ-LN60VG2W/V/B/R Outdoor unit service manual MUZ-LN•VG Series (OBH767) MUZ-LN•VGHZ Series (OBH768) - Page 2 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. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
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Page 3: Technical Changes
TECHNICAL CHANGES These models are compatible with the outdoor units with low standby power control. Connecting these models to the MUZ-LN·VG-series outdoor units enables the low standby power control. Refer to the technical guide about the low standby power control. These models may be connected to the MUZ-LN·VG series after once connected to the MXZ series and operated, for example because of relocation. - Page 4 MSZ-LN18VG2W - MSZ-LN18VG2W - MSZ-LN18VG2V - MSZ-LN18VG2V - MSZ-LN18VG2B - MSZ-LN18VG2B - MSZ-LN18VG2R - MSZ-LN18VG2R - 1. Indoor electronic control P.C. baord has been changed. MSZ-LN25VG2W - MSZ-LN25VG2W - MSZ-LN25VG2V - MSZ-LN25VG2V - MSZ-LN25VG2B - MSZ-LN25VG2B - MSZ-LN25VG2R - MSZ-LN25VG2R - MSZ-LN35VG2W - MSZ-LN35VG2W - MSZ-LN35VG2V -...
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR MSZ-LN18VG2W MSZ-LN25VG2W MSZ-LN35VG2W MSZ-LN50VG2W MSZ-LN60VG2W MSZ-LN18VG2V MSZ-LN25VG2V MSZ-LN35VG2V MSZ-LN50VG2V MSZ-LN60VG2V MSZ-LN18VG2B MSZ-LN25VG2B MSZ-LN35VG2B MSZ-LN50VG2B MSZ-LN60VG2B MSZ-LN18VG2R MSZ-LN25VG2R MSZ-LN35VG2R MSZ-LN50VG2R MSZ-LN60VG2R Air purifying Air inlet device... -
Page 6: Specification
SPECIFICATION MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV Indoor model MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR Power supply Single phase 230 V, 50 Hz Cooling Power input *1 Heating Cooling 0.21 0.23 0.28 0.37 Running current Heating... - Page 7 MSZ-LN18VG2W MSZ-LN25VG2W MSZ-LN35VG2W MSZ-LN50VG2W MSZ-LN60VG2W MSZ-LN18VG2V MSZ-LN25VG2V MSZ-LN35VG2V MSZ-LN50VG2V MSZ-LN60VG2V Indoor model MSZ-LN18VG2B MSZ-LN25VG2B MSZ-LN35VG2B MSZ-LN50VG2B MSZ-LN60VG2B MSZ-LN18VG2R MSZ-LN25VG2R MSZ-LN35VG2R MSZ-LN50VG2R MSZ-LN60VG2R Power supply Single phase 230 V, 50 Hz Cooling Power input *1 Heating Cooling 0.21 0.23 0.28 0.37 Running current Heating 0.26...
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Page 8: Noise Criteria Curve
NOISE CRITERIA CURVE MSZ-LN18VGW MSZ-LN18VGB MSZ-LN18VG2W MSZ-LN18VG2B MSZ-LN18VGV MSZ-LN18VGR MSZ-LN18VG2V MSZ-LN18VG2R 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... - Page 9 MSZ-LN35VGW MSZ-LN35VGB MSZ-LN35VG2W MSZ-LN35VG2B MSZ-LN35VGV MSZ-LN35VGR MSZ-LN35VG2V MSZ-LN35VG2R 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 4000...
- Page 10 MSZ-LN60VGW MSZ-LN60VGB MSZ-LN60VGV MSZ-LN60VGR MSZ-LN60VG2W MSZ-LN60VG2B MSZ-LN60VG2V MSZ-LN60VG2R 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 INDOOR UNIT Test conditions WALL Cooling: Dry-bulb temperature 27 °C Wet-bulb temperature 19 °C Heating: Dry-bulb temperature 20 °C 0.8m...
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Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-LN18VGW/V/B/R- MSZ-LN18VG2W/V/B/R- MSZ-LN25VGW/V/B/R- MSZ-LN25VG2W/V/B/R- MSZ-LN35VGW/V/B/R- MSZ-LN35VG2W/V/B/R- MSZ-LN50VGW/V/B/R- MSZ-LN50VG2W/V/B/R- MSZ-LN60VGW/V/B/R- MSZ-LN60VG2W/V/B/R- Unit: mm INSTALLATION PLATE 11×20 OBLONG HOLE 11×26 OBLONG HOLE WALL HOLE ø65 INDOOR UNIT INSTALLATION PLATE AIR IN PIPING DRAIN HOSE 38.5 38.5 23.5 28.5 AIR OUT 180.5 MSZ-LN25/35VGW-E1/ER1 MSZ-LN50VGW-E1/ER1... - Page 12 MSZ-LN18VG2W- MSZ-LN35VG2W- MSZ-LN60VG2W- MSZ-LN18VG2V- MSZ-LN35VG2V- MSZ-LN60VG2V- MSZ-LN18VG2B- MSZ-LN35VG2B- MSZ-LN60VG2B- MSZ-LN18VG2R- MSZ-LN35VG2R- MSZ-LN60VG2R- MSZ-LN50VG2W- MSZ-LN25VG2W- MSZ-LN50VG2V- MSZ-LN25VG2V- MSZ-LN50VG2B- MSZ-LN25VG2B- MSZ-LN50VG2R- MSZ-LN25VG2R- Unit: mm INSTALLATION PLATE 11×20 OBLONG HOLE 11×26 OBLONG HOLE 115.5 115.5 WALL HOLE ø65 INDOOR UNIT AIR IN INSTALLATION PLATE PIPING DRAIN HOSE 38.5...
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Page 13: Wiring Diagram
WIRING DIAGRAM MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW MSZ-LN60VGW MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN60VGV MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN60VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN60VGR OBH766G... - Page 14 MSZ-LN18VG2W MSZ-LN18VG2V MSZ-LN18VG2B MSZ-LN18VG2R MSZ-LN25VG2W MSZ-LN25VG2V MSZ-LN25VG2B MSZ-LN25VG2R MSZ-LN35VG2V MSZ-LN35VG2B MSZ-LN35VG2R MSZ-LN60VG2W MSZ-LN60VG2V MSZ-LN60VG2B MSZ-LN60VG2R OBH766G...
- Page 15 MSZ-LN18VG2W MSZ-LN35VG2W MSZ-LN18VG2V MSZ-LN35VG2V MSZ-LN18VG2B MSZ-LN35VG2B MSZ-LN18VG2R MSZ-LN35VG2R MSZ-LN25VG2W MSZ-LN60VG2W MSZ-LN25VG2V MSZ-LN60VG2V MSZ-LN25VG2B MSZ-LN60VG2B MSZ-LN25VG2R MSZ-LN60VG2R PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY) KANAT MOTORU İÇ ÜNİTE GÜÇ (DİKEY) KARTI i-see SENSÖR MOTORU DIŞ ÜNİTEYE VARİSTÖR EKRAN RESİSTÖR KAYDEDİCİ...
- Page 16 MSZ-LN50VGW MSZ-LN50VGV MSZ-LN50VGB MSZ-LN50VGR OBH766G...
- Page 17 MSZ-LN50VG2W MSZ-LN50VG2V MSZ-LN50VG2B MSZ-LN50VG2R MSZ-LN50VG2W MSZ-LN50VG2V MSZ-LN50VG2B MSZ-LN50VG2R PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY) İÇ ÜNİTE GÜÇ KANAT MOTORU KARTI (DİKEY) i-see SENSÖR DIŞ ÜNİTEYE MOTORU EKRAN VARİSTÖR KAYDEDİCİ REAKTÖR DEVRE KARTI SİVİÇ/ ODA SICAKLIK BUZZER TERMİSTÖRÜ KARTI Wİ-Fİ...
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Page 18: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW Unit: mm MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN18VG2W MSZ-LN25VG2W MSZ-LN35VG2W MSZ-LN18VG2V MSZ-LN25VG2V MSZ-LN35VG2V MSZ-LN18VG2B MSZ-LN25VG2B MSZ-LN35VG2B MSZ-LN18VG2R MSZ-LN25VG2R MSZ-LN35VG2R Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection... -
Page 19: Service Functions
SERVICE FUNCTIONS MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR MSZ-LN18VG2W MSZ-LN25VG2W MSZ-LN35VG2W MSZ-LN50VG2W MSZ-LN60VG2W MSZ-LN18VG2V MSZ-LN25VG2V MSZ-LN35VG2V MSZ-LN50VG2V MSZ-LN60VG2V MSZ-LN18VG2B MSZ-LN25VG2B MSZ-LN35VG2B MSZ-LN50VG2B MSZ-LN60VG2B MSZ-LN18VG2R MSZ-LN25VG2R MSZ-LN35VG2R MSZ-LN50VG2R MSZ-LN60VG2R 8-1. - Page 20 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. Operation If the main power has been cut, the operation settings remain.
- Page 21 Third party Wi-Fi interfaces cannot be connected to MELCloud. MSZ-LN35VGW/V/B/R Mitsubishi Electric is not responsible for any (i) under performance of a sys- MSZ-LN50VGW/V/B/R tem or any product; (ii) system or product fault; or (iii) loss or damage to any MSZ-LN60VGW/V/B/R system or product;...
- Page 22 XXXXXXXX MODEL : XXXXXXXXXXXX : XXXXXXXXXX SSID : XXXXXXXXXXXX : XXXXXXXXXXXX VOLTAGE (3) Point the remote controller CURRENT MITSUBISHI ELECTRIC CORPRATION MODE UNIT toward the indoor unit and press NET LED RESET MODE WiFi.ASSY DWG No. >PP< XXXXXXXXXXX It shows the network state.
- Page 23 3-2. Setting up in Access Point mode Complete the setting up in the Access Point mode within 3-2.3. Register the information of the router on the air 10 minutes. conditioner. Access Point mode In the displayed window, select Dynamic in To enter the mode DHCP (*1)and enter the information of router, (1) Hold down the Temperature...
- Page 24 • This Wi-Fi module should not be installed and • Make sure that DHCP is enabled, or check IP connected to any Mitsubishi Electric system which is address setting of the Wi-Fi module. to provide application critical cooling or heating.
- Page 25 8-7. ADJUSTING POSITION GAPS BETWEEN THE LEFT AND RIGHT HIRIZONTAL VANES AT UPPER AND LOWER SIDE When there are position gaps between the left and right horizontal vanes at upper and lower side, follow the pro- cedure below for the service. 1.
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Page 26: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-LN18VGW MSZ-LN18VG2W MSZ-LN18VGV MSZ-LN18VG2V MSZ-LN18VGB MSZ-LN18VG2B MSZ-LN18VGR MSZ-LN18VG2R MSZ-LN25VGW MSZ-LN25VG2W MSZ-LN25VGV MSZ-LN25VG2V MSZ-LN25VGB MSZ-LN25VG2B MSZ-LN25VGR MSZ-LN25VG2R MSZ-LN35VGW MSZ-LN35VG2W MSZ-LN35VGV MSZ-LN35VG2V MSZ-LN35VGB MSZ-LN35VG2B MSZ-LN35VGR MSZ-LN35VG2R MSZ-LN50VGW MSZ-LN50VG2W MSZ-LN50VGV MSZ-LN50VG2V MSZ-LN50VGB MSZ-LN50VG2B MSZ-LN50VGR MSZ-LN50VG2R MSZ-LN60VGW MSZ-LN60VG2W MSZ-LN60VGV MSZ-LN60VG2V MSZ-LN60VGB MSZ-LN60VG2B MSZ-LN60VGR MSZ-LN60VG2R WIRELESS REMOTE CONTROLLER... - Page 27 MSZ-LN18VG2W MSZ-LN35VG2W MSZ-LN18VG2V MSZ-LN35VG2V MSZ-LN18VG2B MSZ-LN35VG2B MSZ-LN18VG2R MSZ-LN35VG2R MSZ-LN25VG2W MSZ-LN50VG2W MSZ-LN25VG2V MSZ-LN50VG2V MSZ-LN25VG2B MSZ-LN50VG2B MSZ-LN25VG2R MSZ-LN50VG2R WIRELESS REMOTE CONTROLLER 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 CIRCULATOR button...
- Page 28 9-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) 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 29 NOTE 1: If 2 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”.
- Page 30 (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.
- Page 31 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.
- Page 32 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 33 (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 34 ABSENCE DETECTION ( ) This function automatically changes the operation to No occupancy energy-saving mode or No occupancy Auto-OFF mode when nobody is in the room. (1) To activate this No occupancy energy-saving mode, press SENSOR button until appears on the operation display of the remote controller.
- Page 35 9-11. NIGHT MODE ( ) OPERATION NIGHT MODE changes the brightness of the operation indicator, disables the beep sound and limits the noise level of the outdoor unit. (1) Press NIGHT MODE button during operation to activate NIGHT mode ( ). •...
- Page 36 9-14. OPERATION LOCK This function locks operation mode only. Other functions, such as OFF/ON, temperature setting, or airflow direction adjustment, are available. (1) Hold down button and button simultaneously for 2 seconds while the unit is not operating to enable OPERATION LOCK.
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Page 37: Troubleshooting
TROUBLESHOOTING MSZ-LN18VGW MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN18VGV MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN18VGB MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN18VGR MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR MSZ-LN18VG2W MSZ-LN25VG2W MSZ-LN35VG2W MSZ-LN50VG2W MSZ-LN60VG2W MSZ-LN18VG2V MSZ-LN25VG2V MSZ-LN35VG2V MSZ-LN50VG2V MSZ-LN60VG2V MSZ-LN18VG2B MSZ-LN25VG2B MSZ-LN35VG2B MSZ-LN50VG2B MSZ-LN60VG2B MSZ-LN18VG2R MSZ-LN25VG2R MSZ-LN35VG2R MSZ-LN50VG2R MSZ-LN60VG2R 10-1. - Page 38 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 39 2. Flow chart of AIR PURIFYING power failure mode and i-see SENSOR failure mode recall function Operational procedure The air purifying device or i-see SENSOR might be abnormal. Check if the air purifying device or i-see SENSOR is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function.
- Page 40 4. Table of indoor unit failure mode recall function (When recalled at a set temperature of 24°C) Abnormal point POWER lamp Condition Remedy (Failure mode) 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...
- Page 41 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixied in the refrigerant circuit. 1. Check of the unit. First, ensure that there are no leakage points on the valves, flare connec- *1 "Test Run operation"...
- Page 42 2. Check of Wi-Fi interface 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 LED on the Wi-Fi interface blinking? the Wi-Fi interface.
- Page 43 3. Check of Wi-Fi module MSZ-LN18VG2W- MSZ-LN18VG2V- MSZ-LN18VG2B- MSZ-LN18VG2R- MSZ-LN25VG2W/V/B/R- MSZ-LN35VG2W/V/B/R- MSZ-LN50VG2W/V/B/R- MSZ-LN60VG2W/V/B/R- Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Did the LED indication blink 10 times after you There is a problem in a communication between the air con- selected the setting of the Wi-Fi module and the ditioner and the Wi-Fi module.
- Page 44 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. •...
- Page 45 OPERATION INDICATOR Blinking Not lit (POWER) (AIR PURIFYING) Abnormal Operation indicator lamp Symptom Condition Remedy point • AIR PURIFYING lamp blinks. The operation mode of the each indoor unit is MXZ type Outdoor unit differently set to COOL (includes DRY, FAN) •...
- Page 46 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 47 B Check of remote controller and indoor electronic control P.C. board NOTE: Check if the remote controller is exclusive for this air conditioner. Press OFF/ON (stop/operate) but- ton 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 48 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.
- Page 49 D How to check miswiring and serial signal error MUZ Type Turn OFF the power supply. 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 50 MXZ Type Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. LED indication for communication status Communication status is indicated by the Turn ON the power supply. LED. Unit status Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
- Page 51 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. Turn ON the power supply. Pay careful attention and never touch the air purifying device and the high-voltage lead part.
- Page 52 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.
- Page 53 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor power P.C. board, Indoor electronic control P.C. board, Display and receiver P.C. board, Switch buzzer P.C. board MSZ-LN18VGW/V/B/R- MSZ-LN18VG2W/V/B/R- MSZ-LN25VGW/V/B/R- MSZ-LN25VG2W/V/B/R- MSZ-LN35VGW/V/B/R- MSZ-LN35VG2W/V/B/R- MSZ-LN50VGW/V/B/R- MSZ-LN50VG2W/V/B/R- MSZ-LN60VGW/V/B/R- MSZ-LN60VG2W/V/B/R- Indoor power P.C. board Connector Terminal Varistor (NR11) Fuse (F11) Block (CN201)
- Page 54 Indoor power P.C. board, Indoor electronic control P.C. board, Display and receiver P.C. board, Switch buzzer P.C. board MSZ-LN18VG2W- MSZ-LN35VG2W- MSZ-LN60VG2W- MSZ-LN18VG2V- MSZ-LN35VG2V- MSZ-LN60VG2V- MSZ-LN18VG2B- MSZ-LN35VG2B- MSZ-LN60VG2B- MSZ-LN18VG2R- MSZ-LN35VG2R- MSZ-LN60VG2R- MSZ-LN50VG2W- MSZ-LN25VG2W- MSZ-LN50VG2V- MSZ-LN25VG2V- MSZ-LN50VG2B- MSZ-LN25VG2B- MSZ-LN50VG2R- MSZ-LN25VG2R- Indoor power P.C. board Varistor (NR11) Connector Terminal Fuse (F11)
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Page 55: 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 terminal with locking mechanim. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 56 OPERATING PROCEDURE PHOTOS/FIGURES How to install the front panel (Photos 1, 2, 3) Figure 2 (1) Attach the right and left arm holders (Photo 2). (2) Install the front panel to the indoor unit. (3) Attach the safety string to the center of the panel (F).
- Page 57 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the Wi-Fi interface (Photos 4, 8) Photo 4 Wi-Fi (1) Remove the front panel and the panels (U) (R) (L). interface Lead wires of (2) Remove the Wi-Fi interface on the right side of the the air purifing panel (F).
- Page 58 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electrical box Photo 5 (Photos 4, 5, 6, 7, 8) (1) Remove the front panel, the outer vanes (R) (L) (hori- zontal), and the panels (U) (R) (L) (F) (refer to section 1). (2) Remove the lead wires of indoor coil thermistor, lead wires of air purifying device, and cable of Wi-Fi inter- face from the water cover (Photo 4).
- Page 59 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the indoor electronic control P.C. Photo 8 (Enlarged view of the indoor board, the indoor power P.C. board, the indoor electronic control P.C.bard) terminal block, and the room temperature ther- mistor CN201 TAB3 CN211 CN202 (1) Remove the electrical box (refer to section 3).
- Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the DISPLAY AND i-see SENSOR ASSEMBLY, the switch buzzer P.C. board, the display and receiver P.C. board, and the inter- lock switch (Photo 9) (1) Disengage the 4 catches of the display cover, and remove the display cover (Photo 9-1). (2) Remove the lead wires of the DISPLAY AND i-see SENSOR ASSEMBLY from the hooks (Photo 9-2).
- Page 61 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the outer vane motors Photo 10 (horizontal) (Photos 8, 10, 11, 12, 13) (1) Remove the front panel, the outer vanes (R) (L)(hori- zontal), the panels (U) (R) (L) (F), the corner boxes (R) (L), Wi-Fi interface, DISPLAY and i-see SENSOR ASSEMBLY, V.A.
- Page 62 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the vane motor units (L) (R) (vertical) Photo 14 and the vane motors (horizontal) Screws of the vane motor (1) Remove the front panel, the outer vanes (R) (L) (horizontal) on back side (horizontal), the inner vanes (R) (L), the vane slide Vane motor unit (R) assembly, the panels (U) (R) (L) (F), the corner boxes Vane motor (R)
- Page 63 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the air purifying device Photo 19 (Photo 8, 18) Heat exchanger (1) Remove the front panel, the outer vanes (R) (L)(hori- zontal), the panels (U) (R) (L) (F), the corner box (R), Fan motor V.A. clamp and the electrical cover. (2) Remove the lead wires from the water cover.
- Page 64 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 2016 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2022. No. OBH766 REVISED EDITION-F Issued: Aug. 2021. No. OBH766 REVISED EDITION-F Issued: Dec.