Mitsubishi MXZ-2A52VA Service Manual download pdf (Page 68)

Check of outdoor thermistors

• When thermistor is abnormal. (When the LED display is a table below.)

Normal

Yes

Abnormal

Reconnect the connector in the following table and disconnect the lead wire leading to the compressor.

3 minutes after turning on the power supply, start EMERGENCY OPERATION.

Thermistor

Defrost

Discharge temperature

Outdoor heat exchanger temperature

Fin temperature

Ambient temperature

Symbol

RT61

RT62

RT68

RT64

RT65

Connector, Pin No.

Between CN661 pin1 and pin2

Between CN661 pin3 and pin4

Between CN661 pin5 and pin6

Between CN662 pin1 and pin2

Between CN663 pin1 and pin2

Inverter P.C. board

Board

Thermistor

Defrost

Discharge temperature

Outdoor heat exchanger temperature

Gas pipe temperature (Unit A)

Gas pipe temperature (Unit B)

Gas pipe temperature (Unit C)

Gas pipe temperature (Unit D)

Ambient temperature

Fin temperature

Symbol

RT61

RT62

RT68

RT6A

RT6B

RT6C

RT6D

RT65

RT64

Connector, Pin No.

Between CN661 pin1 and pin2

Between CN661 pin3 and pin4

Between CN661 pin7 and pin8

Between CN662 pin1 and pin2

Between CN662 pin3 and pin4

Between CN662 pin5 and pin6

Between CN662 pin7 and pin8

Between CN663 pin1 and pin2

Between CN3 pin1 and pin2

Outdoor electronic control P.C. board

Outdoor power board

Board

Disconnect the connector in the following table and measure the resistance of the

thermistor to check whether the thermistor is normal or not.

Does thermistor operate 10 minutes or more though the

thermistor abnormality is not displayed?

Replace the thermistor.

Normal

Replace the outdoor electronic

control P.C. board.

MXZ-3A54/4A71/4A80

MXZ-2A40/2A52

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Mitsubishi MXZ-2A52VA Service Manual Page 68

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