Mitsubishi MSZ-HC35VA Service Manual download pdf (Page 34)

H Check of R.V. coil

First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.

In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector

although any signal is not being transmitted to R.V. coil.

Check if CN721 is connected.

Is there 230 VAC between CN721 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter

P.C. board.

Replace the 4-way valve.

Unit operates COOL mode even if it is set to HEAT mode.

Is there 230 VAC between CN721 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter

P.C. board.

Replace the 4-way valve.

Unit operates HEAT mode even if it is set to COOL mode.

Disconnect connector (CN61)

between the compressor and the

intelligent power module.

Turn ON the power supply and press

EMERGENCY OPERATION switch

twice (HEAT mode).

Disconnect connector (CN61)

between the compressor and the

intelligent power module.

Turn ON the power supply and

press EMERGENCY OPERATION

switch once (COOL mode).

Check the resistance of fan motor. (Refer to

11-4.)

Is the resistance of

fan motor normal?

Replace the outdoor

fan motor.

Disconnect the connector CN771 on the

inverter P.C. board.

Disconnect the connector (CN61) between

compressor and power transistor module.

Turn ON the power supply and press the

EMERGENCY OPERATION switch.

Does the upper lamp of

OPERATION

INDICATOR lamp on

the indoor unit light up?

After 3 minutes, is

there voltage 230 VAC

between CN771 and

on the inverter P.C.

board?

Replace the outdoor

fan motor.

Replace the inverter

P.C. board.

Yes

I Check of outdoor fan motor

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 43 44

Comments to this Manuals

No comments

Mitsubishi MSZ-HC35VA Service Manual Page 34

Comments to this Manuals

Related products and manuals for Split-system air conditioners Mitsubishi MSZ-HC35VA