Mitsubishi MCFZ-A18WV Service Manual download pdf (Page 39)

Check of outdoor thermistors

• When OPERATION INDICATOR lamp flashes 6-time.

• When thermistor is abnormal. (When the LED display is a table below.)

Ye s

Reconnect the connector CN661 on the outdoor electronic control P.C. board and CN3 on the power board, and

disconnect the lead wire leading to the compressor.

3 minutes after turning on the power supply, start EMERGENCY OPERATION.

Thermistor

Discharge temperature thermistor

Defrost thermistor

Outdoor heat exchanger temperature thermistor

Fin temperature thermistor

Symbol

RT61

RT62

RT68

RT65

Connector, Pin No.

Between CN661 pin3 and pin4

Between CN661 pin1 and pin2

Between CN661 pin7 and pin8

Between CN3 pin1 and pin2

Start

Disconnect the connector in the electronic control P.C. board (see below table), and

measure the resistance of thermistor. Is the thermistor normal?

Does thermistor operate 10 minutes or more though the

thermistor abnormality is not displayed?

Replace the thermistor.

Normal

Replace the outdoor electronic

control P.C. board.

Check of outdoor fan motor

• Fan motor does not operate or stops operating shortly after starting the operation.

Yes

(Fixed to either 5V or 0V DC)

Start

Check the connection between the

connector CN931 and CN932.

Disconnect CN932 from outdoor electronic control P.C. board, and

turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage of

CN931.

Between 1(+) and 5(-)

Between 2(+) and 5(-)

Between 3(+) and 5(-)

Is the resistance between each terminal

of outdoor fan motor normal?

Does the outdoor fan motor rotates smoothly?

Does the voltage between each terminal become 5V DC and 0V DC

repeatedly?

Replace the outdoor DC fan motor.

Replace the outdoor electronic control P.C. board.

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Mitsubishi MCFZ-A18WV Service Manual Page 39

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