Mitsubishi Electric MSZ-AY25VG-ET1 Service Manual Download Page 51

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Fixing the indoor coil thermistor

* There are 2 forms of parts for fixing the indoor coil thermistor.

NOTE:

Take care to avoid loss and accidental falling of the clip-shape part inside the unit.
Mount the clip-shape part on the marked position.
Do not pull the lead wire when removing the indoor coil thermistor.

Holder shape

Clip shape

When fixing the indoor coil thermistor to
the clip-shape/holder-shape part, the
lead wire should point down.

1. Set the indoor coil

thermistor in the center of
the clip-shape part.

2. Check the (marked)

mounting position.

3. Mount the
clip-shape part.

Position and procedure for mounting the clip-shape part

About the
same length

OBH932

Summary of Contents for MSZ-AY25VG-ET1

Page 1: ...R1 MSZ AY50VGKP E1 SC1 ET1 ER1 SERVICE MANUAL INDOOR UNIT PARTS CATALOG OBB932 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 13 8 SERVICE FUNCTIONS 14 9 MICROPROCESSOR CONTROL 20 10 TROUBLESHOOTING 30 11 DISASSEMBLY INSTRUCTIONS 45 Outdoor unit service manual MUZ AY...

Page 2: ... Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the p...

Page 3: ...erated for example because of relocation In that case the MUZ AY VG VGH series outdoor units will not operate without taking a step Follow the procedure Deleting the memorized abnormal condition described in 10 2 1 MSZ AY25VG ET1 MSZ AY35VG ET1 MSZ AY42VG ET1 MSZ AY50VG ET1 MSZ AY25VGK E1 SC1 ET1 ER1 MSZ AY35VGK E1 SC1 ET1 ER1 MSZ AY42VGK E1 SC1 ET1 ER1 MSZ AY50VGK E1 SC1 ET1 ER1 MSZ AY25VGKP E1 S...

Page 4: ... mm 5 3 Wireless remote controller 1 4 Felt tape For left or left rear piping 1 5 Battery AAA for remote controller 2 6 Air cleaning filter 2 VG and VGK only Emergency operation switch Operation indicator lamp Air purifying lamp VGKP type only Remote control receiving section Horizontal vane Air ﬁlter Front panel Spec name plate 1 Heat exchanger Fan guard Air outlet Air cleaning ﬁlter V Blocking F...

Page 5: ...3 Silent 18 21 28 Heating Super High dB A 45 48 High 39 38 40 43 Med 34 31 35 38 Low 24 29 33 Silent 18 21 28 Fan speed Cooling Super High rpm 940 980 940 1 020 High 760 800 850 Med 650 700 740 Low 560 610 660 Silent 450 520 570 Heating Super High rpm 1 030 1 100 High 770 810 850 Med 670 700 720 Low 560 580 610 Silent 480 510 540 Fan speed regulator 5 Remote controller model VG SH22Q VGK E1 ET1 ER...

Page 6: ...LINE Super High COOLING HEATING 42 45 Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C INDOOR UNIT WALL MICROPHONE 0 8m 1m MSZ AY42VG MSZ AY42VGK MSZ AY42VGKP BAND CENTER FREQUENCIES Hz 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 90 80 70 60 50 40 30 20 10 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70...

Page 7: ...GKP Unit mm Piping Piping ø37 O D ø37 O D ø6 35 0 57m Flared connection ø6 35 ø6 35 0 39m Flared connection ø6 35 ø9 52 0 52m Flared connection ø9 52 ø9 52 0 34m Flared connection ø9 52 Insulation ø29 Connected part ø16 O D Insulation ø29 Connected part ø16 O D Insulation Insulation Liquid line Liquid line Gas line Gas line Drain hose Drain hose E1 SC1 ET1 ER1 OBH932 ...

Page 8: ...8 WIRING DIAGRAM 6 MSZ AY50VG ET1 MSZ AY25VG ET1 MSZ AY35VG ET1 MSZ AY42VG ET1 OBH932 ...

Page 9: ...9 MSZ AY50VGK E1 SC1 ER1 MSZ AY25VGK E1 SC1 ER1 MSZ AY35VGK E1 SC1 ER1 MSZ AY42VGK E1 SC1 ER1 OBH932 ...

Page 10: ...10 MSZ AY50VGK ET1 MSZ AY25VGK ET1 MSZ AY35VGK ET1 MSZ AY42VGK ET1 OBH932 ...

Page 11: ...11 MSZ AY50VGKP E1 SC1 ER1 MSZ AY25VGKP E1 SC1 ER1 MSZ AY35VGKP E1 SC1 ER1 MSZ AY42VGKP E1 SC1 ER1 OBH932 ...

Page 12: ...12 MSZ AY50VGKP ET1 MSZ AY25VGKP ET1 MSZ AY35VGKP ET1 MSZ AY42VGKP ET1 OBH932 ...

Page 13: ...n cooling Refrigerant flow in heating Unit mm Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø9 52 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating MSZ AY25VG MSZ AY35VG MSZ AY25VGK MSZ AY35VGK MSZ AY25VG...

Page 14: ...e 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 After the power is restored the unit restarts automatically according to the memory Howeve...

Page 15: ... The WPS PUSH mode will return to initial state if WPS button is not pressed for 2 minutes 3 1 1 Connect the router to the air conditioner NOTE If the indication LED does not change or blinks 5 times connection fails Please reset connection and setup the Wi Fi interface and the router again Main causes that WPS failed are as follows Communication distance from the Wi Fi interface to router router ...

Page 16: ... information of router then tap the Submit button NOTE It may take several minutes to show the indication above The LED indication does not change or blinks 5 times if connection fails In that case reset connection and set up the Wi Fi interface and the router again NOTE If you want to use Static select Static in DHCP 1 and enter the information of router and network then tap the Submit button 3 2...

Page 17: ...e router does not exceed the limit Make sure that DHCP is enabled or check IP address setting of the Wi Fi interface Check DNS settings of the router or check DNS address of the Wi Fi interface Check if the router is connected to Internet Set up the Wi Fi interface after operating the air conditioner using the wirelessremote controller at least once If the connection fails even after checking the ...

Page 18: ... controller NOTE 1 The room will be warmer if you set the correction value of the room temperature to 5 C 8 5 CHANGING THE CORRECTION VALUE OF THE ROOM TEMPERATURE THE INLET TEMPERATURE 1 How to change the correction value of the room temperature 1 Press OFF ON button on the remote controller to turn the indoor unit off Figure 1 2 Point the remote controller at the indoor unit While you hold down ...

Page 19: ...aced in servicing the correction value is reset The numerical value any of 3 4 or 5 described on the wiring diagram will be needed when a service man sets the correction value again after replacing the P C board NOTE 3 The instruction for setting the correction value again is attached to the indoor electronic control P C board of the service part as well If you cut the jumper wire JR24 Refer to 10...

Page 20: ...ator Operation display section WIDE VANE button VANE control button SELF CLEAN button Signal transmitting section Temperature buttons OFF ON stop operate button Indication of remote controller model is on back FAN speed control button Operation select button CIRCULATOR button CLOCK button WEEKLY TIMER set buttons TIME TIMER set buttons forward button backward button RESET button i save button NIGH...

Page 21: ...indoor fan operates at the set speed and the compressor stops This mode continues until the temperature of indoor heat exchanger rises 2 Low outside temperature operation When the outside temperature is lower low outside temperature operation starts and the outdoor fan slows or stops 3 Indoor fan speed control When the thermostat turns OFF the indoor fan operates very Low to reduce power consumpti...

Page 22: ...ith AUTO operation from OFF If the room temperature is higher than the set temperature operation starts in COOL mode If the room temperature is equal to or lower than the set temperature operation starts in HEAT mode 2 Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 1 C below the set temperature HEAT mode changes to COOL mode when about 15 min...

Page 23: ... 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 5 when the compressor cumulative operation time exceeds 1 hour the vane angle automatically changes to Angle 4 for dew prevention 7 SWING mode By selecting SWING mode with Up down airflow contro...

Page 24: ... the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK button 2 Press OFF ON stop operate button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button during operation b Set the time of the timer using TIME S...

Page 25: ...e weekly timer setting mode blinks 2 Press and buttons to select setting day and number Pressing selects the day of the week to be set Pressing selects the setting number E g Mon Tue Sun and 1 are selected All days can be selected 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 deletes timer setting Pressing adjusts th...

Page 26: ...er setting 1 Press button to enter the weekly timer setting mode blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them will be displayed 9 9 NIGHT MODE OPERATION NIGHT MODE changes the brightness of the operation ind...

Page 27: ...n are held down to enable or disable OPERATION LOCK or button is pressed during operation while OPERATION LOCK is enabled AIR PURIFYING operation is not available when OPERATION LOCK is enabled in a mode other than FAN mode 9 12 AIR PURIFYING OPERATION MSZ AY VGKP In the AIR PURIFYING operation the indoor unit built in device reduces airborne fungi viruses mold and allergens 1 Press PURIFIER butto...

Page 28: ...e coil frost prevention works even in the test run or the emergency operation In the test run or the emergency operation the horizontal vane operates in VANE AUTO mode The emergency operation continues until the emergency operation switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press the emergenc...

Page 29: ... OFF before starting ser vice work 2 Before servicing verify that all connectors and terminals are connected properly 3 When the electronic control P C board seems to be defective check for disconnection of the copper foil pattern and burnt or discolored components 4 When troubleshooting refer to 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfuncti...

Page 30: ... headed towards the indoor unit Press the emergency operation switch so that the memorized abnormal condition is deleted 4 Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condi...

Page 31: ...ailure mode recall function The air purifying device might be abnormal Check if the air purifying device is abnormal according to the following procedures ON OFF Beeps Repeated cycle Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps After repairing the unit recall the failure mode again according to Setting up th...

Page 32: ...e indoor electronic control P C board Replace the indoor electronic control P C board 5 Table of indoor unit failure mode recall function When recalled at a set temperature of 23 C Table of AIR PURIFYING power failure mode recall function 5 time blink When the voltage between CN1T1 and GND on the electronic P C board rises above 3V 4 time blink AIR PURIFYING power When the voltage between CN1T1 an...

Page 33: ...wer sys tem abnormality Upper lamp 6 time blink Cause Outdoor unit Trouble of thermistor in outdoor unit Upper lamp 7 time blink Cause Outdoor unit Trouble of outdoor con trol system Upper lamp 14 time blink or more Cause Outdoor unit Other abnormality Indoor Outdoor unit Trouble of thermistors Refer to 10 6 How to check miswir ing and serial signal error Check room temperature thermistor and indo...

Page 34: ... that the number of the connected devices to the router does not exceed the limit Make sure that DHCP setting is enabled Make sure that DNS setting of the router and DNS address of the Wi Fi interface are correct Make sure that the router is connected to the internet Make sure that the communication is not limited with secu rity of the router If the problem persist even after you check above follo...

Page 35: ...al Check the stop valve 6 Outdoor thermistors Upper lamp blinks 6 time blink 2 5 second OFF The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual 7 Outdoor control system Upper lamp blinks 7 time blink 2 5 second OFF It cannot properly read data in the nonvolatile memory of the inverter P C board or t...

Page 36: ...mistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Vane motor MV1 Horizontal Upper Measure the resistance between the terminals with a multimeter Temperature 10 to 30 C Color of the lead wire Normal RED SKY 262 328 Ω SKY SKY RED SKY SKY Vane motor MV2 Horizontal Lower Measure the resistance between the terminals with a multimeter Temperature 10 to 30 C Color of the lead wire Normal RE...

Page 37: ...tronic control P C board 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after the emergency operation switch is pressed the voltage measured at 2 above goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after the emergency ope...

Page 38: ...start type within the range of 1 m 2 Yes No Reinstall the unit away from lights Attach a filter on receiving part Replace the indoor electronic control P C board Including the receiver 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 It is normal if the LED of the signal transmitting section lights up when the...

Page 39: ...ector 1 2 Yes Is the resistance 1MΩ or more Replace the fuse F11 and the indoor fan motor 3 No Replace the fuse F11 3 Measure the resistance of resistor R111 MSZ AY25 35 42VG VGK VGKP reac tor L112 MSZ AY50VG VGK VGKP on the indoor power P C board No Replace the indoor electronic control P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of th...

Page 40: ...continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replace the indoor electronic control P C board Yes Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Does DC 6V or more occur between indoor terminal block S2 and S3 Yes Replace the outdoor inverter P C board 1 No Replace the indoor electronic control P C...

Page 41: ...indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board 2 Be careful of the residual voltage of smoothing capacitor Replace the outdoor control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor connecting wire ...

Page 42: ...ectronic control P C board High voltage approximately 5 8kV is generated during AIR PURIFYING power operation Pay careful attention and never touch the air purifying device and the high voltage lead part Yes No OFF Continuously blinking OFF Continuously blinking Does AIR PURIFYING lamp blink 2 time with unit stopping Turn ON the power supply Replace the indoor electronic control P C board Remove t...

Page 43: ...he installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outd...

Page 44: ...VGKP MSZ AY42VGKP MSZ AY50VGKP Timer short mode point Refer to 8 1 Indoor fan motor CN211 0 or 15 V DC 3 6 V DC 15 V DC GND high voltage DC 325 V DC Reactor L112 MSZ AY50 Resistor R111 MSZ AY25 35 42 Varistor NR11 Vane motor CN151 Fuse F11 Indoor coil thermistor RT12 RT13 CN112 Room temperature thermistor RT11 CN111 5 V DC 12 V DC GND To disable Auto restart function cut the Jumper wire to JR77 Re...

Page 45: ...Hinge 45 DISASSEMBLY INSTRUCTIONS 11 Front panel Horizontal vane L Horizontal vane U Unlock Upper Lower Unlock Unlock the stopper and remove the horizontal vanes using following tool like a screw driver 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 term...

Page 46: ...e panel L toward you to remove Removing the panel F Photos 1 2 3 Figure 1 1 Remove the front panel and the horizontal vanes U L 2 Remove the panels R L 3 Remove the Wi Fi interface on the right side of the panel F Pull out its cable and remove the cable tie Refer to section 2 4 Remove the panel F from the bottom to the top Removing the panel U Photo 2 Figure 1 1 Remove the front panel and the hori...

Page 47: ...guide How to install the Wi Fi interface Photo 3 Note Install the Wi Fi interface before installing the panel R 1 Install the panel F 2 Fasten the cable of Wi Fi interface to the part of the panel F with a cable tie 3 Stow the cable of Wi Fi interface in the area 4 Attach the Wi Fi interface so that its cable is facing away from you on the right side 5 Attach the lead wire of the Wi Fi interface t...

Page 48: ... electronic control P C board 1 Remove the indoor electrical box Refer to section 3 2 Remove the screw of the terminal block Photo 5 3 Remove the earth wire connected to the electrical box from the indoor electronic control P C board 4 Remove the indoor terminal P C board 5 Pull the display and receiver P C board holder as if opening the door at 90 degrees Remove the display and receiver P C board...

Page 49: ...to 5 Indoor electronic control P C board CN151 Vane motors 4 Pull out the drain hose from the nozzle assembly Pull and remove the nozzle assembly refer to section 5 Removing the vane motors U L horizontal Photo 7 5 Remove the 2 screws of the vane motor unit U L and remove the lead wires of the vane motors U L horizontal 6 Remove the screw of the vane motor unit L horizon tal and remove the vane mo...

Page 50: ... slightly toward you and remove it by pulling to the right Photo 11 5 Remove the indoor coil thermistor from the heat exchanger 6 Remove the 2 screws of the hairpin holder on the left side of the heat exchanger Raise the left side of the heat exchanger and pull the line flow fan to the lower left to remove Photo 12 1 When attaching the line flow fan screw the line flow fan so 4 mm gap is provided ...

Page 51: ...ked position Do not pull the lead wire when removing the indoor coil thermistor Holder shape Clip shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape par...

Page 52: ...ICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2022 MITSUBISHI ELECTRIC CORPORATION Published Dec 2022 No OBH932 Made in Japan Specifications are subject to change without notice ...

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Mitsubishi Electric MSZ-AY25VG-ET1, Service Manual

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