Mitsubishi Electronics MUY-D30NA, MUZ-D36NA, MUY-D36NA, U1, MUZ-D30NA Check of outdoor thermistors

Models: MUY-D36NA MUZ-D30NA U1 MUY-D30NA MUZ-D36NA

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OPERATION INDICATOR lamp flashes 6-times.

Thermistor is abnormal.

B Check of outdoor thermistors

Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor.

 

 

 

 

 

 

 

 

 

Replace the thermistor except RT64.

Is the thermistor normal? (Refer to 10-6.1.)

 

 

 

 

When RT64 is abnormal, replace the

No

 

Yes

 

outdoor power board.

 

 

 

 

 

 

 

 

 

 

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Does the unit operate for 10 minutes or more

 

 

 

 

 

 

 

Replace the outdoor power board.

 

without showing thermistor abnormality?

 

No

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK.

 

 

 

 

 

 

 

 

 

 

(Cause is poor contact.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistor

Symbol

 

 

Connector, Pin No.

Board

Defrost (MUZ)

RT61

Between CN661 pin1 and pin2

 

 

Discharge temperature

RT62

Between CN661 pin3 and pin4

Outdoor electronic control P.C. board

Outdoor heat exchanger temperature

RT68

Between CN661 pin7 and pin8

 

 

Ambient temperature

RT65

Between CN663 pin1 and pin2

 

 

Fin temperature

RT64

Between CN3 pin1 and pin2

Outdoor power board

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Mitsubishi Electronics MUY-D30NA, MUZ-D36NA, MUY-D36NA, U1, MUZ-D30NA service manual Check of outdoor thermistors

MUY-D36NA, MUZ-D30NA, U1, MUY-D30NA, MUZ-D36NA specifications

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