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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-AY15VG
MSZ-AY20VG
MSZ-AY15VGK
MSZ-AY20VGK
MSZ-AY15VGKP
MSZ-AY20VGKP
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ET1
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ET1
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E1
ET1
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E1
ET1
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E1
ET1
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E1
ET1
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Outdoor unit service manual
MUZ-AY•VG Series (OBH938)
MXZ-F•VF Series (OBH790)
CONTENTS
1. TECHNICAL CHANGES ······························ 3
2. PART NAMES AND FUNCTIONS ·················· 4
3. SPECIFICATION ········································ 5
4. NOISE CRITERIA CURVES ·························· 6
5. OUTLINES AND DIMENSIONS ····················· 7
6. WIRING DIAGRAM ····································· 8
7. REFRIGERANT SYSTEM DIAGRAM ············ 11
8. SERVICE FUNCTIONS ·······························12
9. MICROPROCESSOR CONTROL ··················18
10. TROUBLESHOOTING ································26
11. DISASSEMBLY INSTRUCTIONS ··················42
PARTS CATALOG (OBB937)
No. OBH937
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Table of Contents
Troubleshooting
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Summary of Contents for Mitsubishi Electric MSZ-AY15VG-ET1
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Page 1: Table Of Contents
INDOOR UNIT No. OBH937 SERVICE MANUAL Models MSZ-AY15VG MSZ-AY20VG MSZ-AY15VGK MSZ-AY20VGK MSZ-AY15VGKP MSZ-AY20VGKP Outdoor unit service manual MUZ-AY•VG Series (OBH938) MXZ-F•VF Series (OBH790) CONTENTS 1. TECHNICAL CHANGES ······························ 3 2. PART NAMES AND FUNCTIONS ·················· 4 3. SPECIFICATION ········································ 5 4. - 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-AY·VG series outdoor units enables the low standby power control. These models may be connected to the MUZ-AY·VG 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-AY15VG MSZ-AY15VGK MSZ-AY15VGKP MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP Air purifying device (VGKP type only) Front panel Air inlet Wi-Fi interface (VGK/VGKP type only) Air fi lter Air cleaning filter (V Blocking Filter, VGKP type: option) Spec name plate *1 Emergency operation switch *1 The manufacturing year... -
Page 5: Specification
SPECIFICATION MSZ-AY15VG MSZ-AY20VG Indoor model MSZ-AY15VGK MSZ-AY20VGK MSZ-AY15VGKP MSZ-AY20VGKP Power supply Single phase 230 V, 50 Hz Cooling Power input *1 Heating Cooling 0.17 0.19 Running current *1 Heating 0.17 0.19 Model RC0J25-DB Cooling 0.17 0.19 Current *1 Heating 0.17 0.19 Dimensions W ×... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-AY15VG MSZ-AY20VG MSZ-AY15VGK MSZ-AY20VGK MSZ-AY15VGKP MSZ-AY20VGKP 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 Test conditions INDOOR UNIT Cooling: Dry-bulb temperature 27°C WALL Wet-bulb temperature 19°C Heating: Dry-bulb temperature 20°C... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP Unit: mm MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP OBH937... -
Page 8: Wiring Diagram
WIRING DIAGRAM MSZ-AY15VG - MSZ-AY20VG - İÇ ÜNİTE ELEKTRONİK İÇ ÜNİTE SEMBOL PARÇA ADI SEMBOL PARÇA ADI KONTROL KARTI TERMİNAL KARTI ODA SICAKLIK SİGORTA (T3.15AL250V) TERMİSTÖRÜ BORU SICAKLIK FAN MOTORU TERMİSTÖRÜ(ANA) BORU SICAKLIK KANAT MOTORU (YATAY ÜST) TERMİSTÖRÜ(YARDIMCI) KANAT MOTORU TERMİNAL BLOĞU (YATAY ALT) VARİSTÖR... - Page 9 MSZ-AY15VGK - MSZ-AY20VGK - MSZ-AY15VGK - MSZ-AY20VGK - OBH937...
- Page 10 MSZ-AY15VGKP - MSZ-AY20VGKP - MSZ-AY15VGKP - MSZ-AY20VGKP - OBH937...
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Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP Unit: mm MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating... -
Page 12: Service Functions
SERVICE FUNCTIONS MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP 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 13 8-4. Wi-Fi INTERFACE SETTING UP (VGK/VGKP type only) 3-1. Setting up in WPS-PUSH mode This Wi-Fi interface, communicates the status information and controls the commands from the MELCloud by To enter the mode WPS-Push mode connecting to the indoor unit. (1) Hold down the Temperature Front panel Front panel...
- Page 14 3-2. Setting up in Access Point mode 3-2.3. Register the information of the router on the air conditioner. Complete the setting up in the Access Point mode within 10 minutes. In the displayed window, select Dynamic in Access Point mode DHCP (*1) and enter the information of router, To enter the mode then tap the Submit button.
- Page 15 • This Wi-Fi interface should not be installed and the router does not exceed the limit. connected to any Mitsubishi Electric system which is • Make sure that DHCP is enabled, or check IP to provide application critical cooling or heating.
- Page 16 8-5. CHANGING THE CORRECTION VALUE OF THE ROOM TEMPERATURE (THE INLET TEMPERATURE) The correction value of the room temperature can be adjusted in the range of 2 to 5 °C with the remote controller. Normally, the temperature at the room temperature sensor might become higher than that around feet because warm air tends to accumulate around an indoor unit during heating operation.
- Page 17 2. Writing the correction value of the room temperature on the wiring diagram After setting the correction value of the room temperature (the inlet air temperature), follow 11. DISASSEMBLY INSTRUCTIONS to disassemble the indoor unit, and then write the correction value (any of 3, 4, or 5) on the wiring dia- gram with a ballpoint pen, etc.
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Page 18: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal: About 6 m Beep(s) is (are) heard from the indoor unit when the Battery replacement indicator signal is received. Operation select button Fan speed control button Operation display section Vane control button ECONO COOL button... -
Page 19: Cool Operation
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 20: Operation Indicator
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 21: Timer Operation
(5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) When Off/On(stop/operate) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When ON TIMER is ON standby. (6) Dew prevention During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention. -
Page 22: Program Timer
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 23 (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 Pressing temperature. deletes timer setting. * Hold down the button to change the time quickly. Press buttons to continue setting the timer for other days and/or numbers.
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Page 24: I-Save Operation
9-10. I-SAVE ( ) OPERATION 1. How to set I-SAVE operation (1) Press Off/On(stop/operate) button. (2) Select COOL, HEAT, ECONO COOL or NIGHT MODE. (3) Press I-SAVE button. (4) Set the temperature, fan speed, and airflow direction for I-SAVE operation. NOTE: •... -
Page 25: Self Clean Operation
9-14. SELF CLEAN OPERATION The self clean operation helps to keep the unit clean and prevents mold growth by performing fan operation for about 25 min- utes. It is recommended to keep self clean operation active at all times. (1) Press Self clean button to activate self clean operation. •... -
Page 26: Troubleshooting
TROUBLESHOOTING MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP 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. - Page 27 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 28 2. Flow chart of AIR PURIFYING power failure mode recall function (MSZ-AY•VGKP) 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. With the remote controller headed towards the indoor unit, press TEMP *1.
- Page 29 4. Table of indoor unit failure mode recall function Left lamp of Abnormal point Operation Condition Remedy (Failure mode) indicator 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 30 10-3. INSTRUCTION OF TROUBLESHOOTING 1. Check of the unit. *2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit. First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the refrigerant circuit, or no blockage points (e.g.
- Page 31 2. Check of Wi-Fi interface (MSZ-AY·VGK/VGKP) 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 selected the setting of the Wi-Fi interface and the conditioner and 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 is MXZ type Outdoor unit differently set to COOL (includes DRY) and •...
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Page 34: Troubleshooting Flow
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. Turn ON the power supply, wait 5 seconds or more, and then press the 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 Off/On(stop/operate) button on the *1 Look at the image of the signal transmitting section of the remote controller. 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 Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connector CN151 from the Measure the resistance between Short circuit: CN211 of the indoor fan motor indoor electronic control P.C.
- Page 37 D How to check miswiring and serial signal error MUZ 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 38 MXZ Type Turn OFF the power supply. LED indication for communication status Communication status is indicated Is there rated voltage in Check the power by the LED. the power supply? supply. Unit status Blinking: normal communication Lit: abnormal communication or not connected Turn ON the power supply.
- Page 39 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 40 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 out- distance between the antennas and the door unit.
- Page 41 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor terminal P.C. board, Indoor electronic control P.C. board, Switch/buzzer P.C. board, Display P.C. board, Receiver P.C. board MSZ-AY15VG MSZ-AY15VGK MSZ-AY15VGKP MSZ-AY20VG MSZ-AY20VGK MSZ-AY20VGKP Indoor terminal P.C.Board To disable “Auto restart function” cut the Jumper wire to JR77. Fuse (Refer to 8-3.) (F11)
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Page 42: 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 mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 43 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor electronic control P.C. Photo 2 Screw of the air purifying device (VGKP only) board, receiver P.C. board, display P.C. board, Wi-Fi interface (VGK/VGKP only) switch/buzzer P.C. board, Wi-Fi interface and air Screw of purifying device the electrical (1) Remove the panel (Refer to section 1) and the corner...
- Page 44 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electrical box Photo 5 (1) Remove the panel (Refer to section 1) and the corner box. (2) Remove the indoor/outdoor connecting wire, electrical Front cover of cover and earth wire connected to the indoor heat the display and exchanger from the electrical box.
- Page 45 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor and the line flow Photo 8 Catches of the water cover (1) Remove the panel (Refer to section 1) and the corner box. Motor band (2) Remove the display and receiver P.C. board holder, the electrical box (Refer to section 3) and the nozzle assembly (Refer to section 4).
- Page 46 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 2023 MITSUBISHI ELECTRIC CORPORATION Published: Aug. 2023. No. OBH937 Made in Japan...
- Page 47 Related Links Model Number: MSZ-AY20VGKP MSZ-AY15-20VGK Installation Manual MSZ-AY15-20VGK Parts List MSZ-AY15-20VGK Service Manual...
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