Mitsubishi MSH-24NV Service Manual download pdf (Page 31)

Check of outdoor thermistor

Measure

resistance

between CN 661

1 and 2.

Measure

resistance

between CN 662

3 and 4.

Yes

Replace the

thermistor.

Reconnect CN661

and CN662.

Turn ON the power

supply and press

the EMERGENCY

OPERATION

switch.

Does the resistance

of thermistor have

the characteristics

on page 33?

Yes

Does the unit operate

10 minutes or more?

Replace the deicer P.C.

board.

Ok W1.

W1. It is thought defective contact of the connector.

Turn OFF the

power supply.

Ambient temperature

thermistor(RT63)

Defrost thermistor(RT61)

Thermistors in the outdoor unit are abnormal.

w Disconnect the connectors CN661 and/or CN662 from the deicer P.C. board.

(Check the characteristics of each thermistor.)

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Mitsubishi MSH-24NV Service Manual Page 31