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[ VII Troubleshooting ]

- 18 -

HWE1804A GB

2. DC fan motor (fan motor/indoor control board)

1. CAUTION

A high voltage is applied to the connector for connection to the fan motor (CNMF1).

Do not unplug the connector CNMF1 with the unit energized to avoid damage to the indoor control board and fan motor.

Electric shock hazard. Do not touch the motor when energized.

2. Troubleshooting

Symptom: Indoor unit fan does not run.

Check fan motor connector contact

(CNMF1).

Fix the connection.

Ye s

Is the fan motor connector

(CNMF1) fully inserted?

Replace the indoor control board.

Ye s

Is the voltage within the

normal range?

Check the power supply.

Measure the voltage at the indoor control board.

15VDC (same with the voltage between fan connector 5 (+) and 4(-))

1 - 6.5VDC (same with the voltage between fan connector 6 (+) and 4(-))

[Values for Vsp are the values that are measured with the fan motor in operation.

Vsp is 0V when the fan motor is stopped.]

Power supply voltage

310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))

Check the fan motor position thermistor signal.

Get the motor to make a full rotation or more, and measure the voltage at the test point

(same with the voltage between fan connector 7 (+) and 4(-))

Replace the indoor control board.

Ye s

Replace the motor.

Are 0VDC and 15VDC

displayed alternately?

Mitsubishi Electric CITY MULTI PEFY Series User Manual

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