Mitsubishi MCFZ-A18WV Service Manual download pdf (Page 37)

Check of R.V. coil

Yes

Start

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 power supply of indoor and outdoor unit.

1. Turn off power supply of indoor and outdoor unit, and

disconnect the connector CN781 in the outdoor electronic

control P.C. board.

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 in noise filter P. C.

board. Is there normal

resistance to R.V. coil?

Start

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 power supply of indoor and outdoor unit, and

disconnect the connector CN781 in the outdoor electronic

control P.C. board.

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 (-)? W

Replace the outdoor electronic control P.C. board.

W 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. (LED display: Both LED1 and LED2 lighting)

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Mitsubishi MCFZ-A18WV Service Manual Page 37

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