Table of Contents
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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-FT25VG
MSZ-FT35VG
MSZ-FT50VG
MSZ-FT25VGK
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E1
MSZ-FT35VGK
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MSZ-FT50VGK
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CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES ··························5
5. OUTLINES AND DIMENSIONS ·····················6
6. WIRING DIAGRAM ·····································7
7. REFRIGERANT SYSTEM DIAGRAM ··········· 10
8. SERVICE FUNCTIONS ······························ 11
9. MICROPROCESSOR CONTROL ················ 13
10. TROUBLESHOOTING ······························· 22
11. DISASSEMBLY INSTRUCTIONS ················· 36
PARTS CATALOG (OBB864)
No. OBH864
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Outdoor unit service manual
MUZ-FT∙VG Series (OBH865)
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SC1
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSZ-FT25VG-E1
Summary of Contents for Mitsubishi Electric MSZ-FT25VG-E1
- Page 1 INDOOR UNIT No. OBH864 SERVICE MANUAL Models MSZ-FT25VG MSZ-FT25VGK MSZ-FT35VG MSZ-FT35VGK MSZ-FT50VG MSZ-FT50VGK Outdoor unit service manual MUZ-FT∙VG Series (OBH865) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3. SPECIFICATION ········································4 4. NOISE CRITERIA CURVES ··························5 5. OUTLINES AND DIMENSIONS ·····················6 6.
- 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.
- Page 3 PART NAMES AND FUNCTIONS MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK Air inlet Front panel Wi-Fi interface Air fi lter (Air purifying fi lter) Air cleaning fi lter (Silver-ionized air purifi er fi lter) Emergency operation switch Horizontal vane Air outlet Heat exchanger Spec name plate Remote controller...
- Page 4 SPECIFICATION MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG Indoor model MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.26 0.29 0.33 Running current Heating 0.35 0.36 0.41 Model RC0J30-CV Cooling 0.26 0.29 0.33 Current Heating 0.35 0.36 0.41 Dimensions W ×...
- Page 5 NOISE CRITERIA CURVES MSZ-FT25VG MSZ-FT35VG MSZ-FT25VGK MSZ-FT35VGK FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) LINE LINE COOLING COOLING 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 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MSZ-FT50VG MSZ-FT50VGK...
- Page 6 OUTLINES AND DIMENSIONS MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG Unit: mm MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK OBH864...
- Page 7 WIRING DIAGRAM MSZ-FT25VG- MSZ-FT35VG- MSZ-FT50VG- OBH864...
- Page 8 MSZ-FT25VGK- MSZ-FT35VGK- MSZ-FT50VGK- OBH864...
- Page 9 MSZ-FT25VGK- PARÇA ADI SİGORTA (T3.15AL250V) FAN MOTORU KANAT MOTORU (YATAY ÜST) DIŞ KANAT MOTORU (YATAY ALT) ÜNİTEYE KANAT MOTORU İÇ ÜNİTE (DİKEY) ELEKTRONİK İÇ ÜNİTE VARİSTÖR KONTROL KARTI TERMİNAL KARTI RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK SİVİÇ/BUZZER TERMİSTÖRÜ(ANA) KARTI BORU SICAKLIK TERMİSTÖRÜ(YARDIMCI) NOTLAR : 1.
- Page 10 REFRIGERANT SYSTEM DIAGRAM MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG Unit: mm MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Indoor coil thermistor RT13 Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating OBH864...
- Page 11 SERVICE FUNCTIONS MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C. board. (Refer to 10-7.) • The set time for the ON/OFF timer can be reduced to 1 second for each minute. •...
- Page 12 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.
- Page 13 MICROPROCESSOR CONTROL MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK WIRELESS REMOTE CONTROLLER MSZ-FT25VG MSZ-FT25VGK MSZ-FT25VGK MSZ-FT35VG MSZ-FT35VGK MSZ-FT35VGK MSZ-FT50VG MSZ-FT50VGK MSZ-FT50VGK Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from the indoor unit when the signal is received.
- Page 14 INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. •The following indication applies regardless of shape of the indication. Indication Operation state Room temperature The unit is operating to About 2°C or more away reach the set temperature from set temperature...
- Page 15 1. Cold air prevention control When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem- perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed. 2.
- Page 16 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 17 2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE CONTROL button. (3) Positioning (SWING) To confirm the standard position, the vane moves until it touches the vane stopper.
- Page 18 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
- Page 19 (3) Press , and buttons to set ON/OFF, time, and temperature. E.g. : [ON], [6:00] and [24°C] are selected. Pressing selects ON/OFF timer. Pressing Pressing adjusts the time. adjusts the tem- Pressing perature. deletes timer setting. * Hold down the button to change the time quickly. * The temperature can be set between 16°C and 31°C at COOL operation.
- Page 20 9-9. 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 21 9-12. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch in the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down.
- Page 22 TROUBLESHOOTING MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK 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 after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
- Page 23 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 24 2. Table of indoor unit failure mode recall function Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lit Normal — — The room temperature thermistor short or 1-time blink every Room tempera- Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second ture thermistor...
- Page 25 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 lamp on indoor unit is not operate normally. not operate. the signal from blinking ON and OFF.
- Page 26 2. Check of Wi-Fi interface (MSZ-FT·VGK) Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Start Is UNIT LED on the Wi-Fi interface There is a problem in communication between the air conditioner and blinking? the Wi-Fi interface.
- Page 27 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 28 OPERATION INDICATOR Blinking Not lit Abnormal Operation indicator lamp Symptom Condition Remedy point Upper 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 29 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. NOTE: 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 30 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OFF/ON (stop/operate) 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 31 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance of indoor fan Short circuit: and vane motor connector CN151 from the motor. Replace the indoor fan motor. indoor electronic control P.C.
- Page 32 D How to check miswiring and serial signal error MUZ Type 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 in the indoor unit.
- Page 33 MXZ Type LED indication Turn OFF the power supply. for communication status Communication status is indicated by the LED. Unit status Is there rated voltage in Blinking: normal communication Check the power supply. the power supply? Lighting: abnormal communication or not connected Pattern 1 and 2 is repeatedly displayed Turn ON the power supply.
- Page 34 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 35 10-7. TEST POINT DIAGRAM AND VOLTAGE 1. Indoor electronic control P.C. board, indoor terminal P.C. board, receiver P.C. board, P.C. board switch/buzzer P.C. board display MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK Indoor electronic control To disable P.C. board "Auto restart function", cut the Jumper wire Cut the jumper wire JR24 when to JR77.
- Page 36 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 following 2 types 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.
- Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor terminal P.C. board, indoor Photo 3 electronic control P.C. board, the display P.C. Water cover Earth plate board, the switch/buzzer P.C. board, the receiver Indoor coil ther- P.C. board, and the electrical box mistor lead wire <Removing the electrical box>...
- Page 38 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the nozzle assembly and the vane Photo 5 motor <Removing the nozzle assembly> (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Refer to section 2.) (3) Remove the electrical cover.
- Page 39 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 8 thermistor and the line flow fan Motor band (1) Remove the panel. (Refer to section 1.) Remove the right corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2, 3.) (3) Remove the screws fixing the motor bed.
- Page 40 11-2. MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK NOTE: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Photo 2-1 1. Removing the panel (1) Remove the front panel. Remove the horizontal Front panel Horizontal vanes Wi-Fi interface...
- Page 41 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 Water cover Indoor coil ther- 2. Removing the Wi-Fi interface mistor lead wire (1) Remove the panel (Refer to section 1.) and the corner Wi-Fi interface Earth plate box right. (2) Remove the screw of the V.A. clamp. Screw of Remove the V.A.
- Page 42 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the nozzle assembly and the vane Photo 5 motor <Removing the nozzle assembly> (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor connecting wire. (Refer to section 2.) (3) Remove the electrical cover.
- Page 43 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the indoor fan motor, the indoor coil Photo 8 thermistor and the line flow fan Motor band (1) Remove the panel. (Refer to section 1.) Remove the right corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2, 3.) (3) Remove the screws fixing the motor bed.
- Page 44 Mount the clip-shape part on the marked position. 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 2020 MITSUBISHI ELECTRIC CORPORATION Published: Jun. 2020. No. OBH864 Made in Japan...