Mitsubishi Electric MXZ-3C68VA Service Manual download pdf (Page 66)

Check of R.V. coil

Yes

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY

OPERATION in HEAT mode.

Is there voltage of 230V AC between pin1 and

pin 2 at connector CN912?

Turn OFF the power supply of indoor and outdoor unit.

1. Turn OFF the power supply of indoor and outdoor unit, and

disconnect the connector CN781.

2. 3 minutes after turning ON the power supply, start

EMERGENCY OPERATION in HEAT mode.

Replace the 4-way valve.

Replace the noise filter P.C. board.

Replace the R.V. coil.

Is there voltage 12V DC

between the connector

CN781 pin 5 (+) and pin 3 (-) ?

Replace the electronic

control P.C. board.

Disconnect the connector

CN912. Is there normal

resistance to R.V. coil?

(Refer to 11-5.)

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY

OPERATION in COOL mode.

Is there voltage of 230V AC between pin1 and

pin 2 at connector CN912?

1. Turn OFF the power supply of the indoor and the outdoor

unit, and disconnect the connector CN781.

2. 3 minutes after turning ON the power supply, start

EMERGENCY OPERATION in COOL mode.

Replace the 4-way valve.

Replace the noise filter P.C. board.

Is there voltage 12V DC

between the connector CN781

pin 5 (+) and pin 3 (-) ?

Replace the outdoor electronic control P.C. board.

If the connector CN912 is not connected or R.V. coil is open, voltage

occurs between terminals even when the control is OFF.

• When heating operation does not work.

• When cooling operation does not work.

The cooling operation or heating operation does not operate.

CN912

CN781

Outdoor electronic control

.C. board

MXZ-3C/4C/5C

Noise filter P.C. board

MXZ-3C54/3C68/4C71/4C80/5C100VA

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Mitsubishi Electric MXZ-3C68VA Service Manual Page 66

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