How to Check Inverter Compressor for Mitsubishi Air Conditioners

10-5. TROUBLESHOOTING FLOW

OPERATION / INDICATOR lamp flashes 5-times. Outdoor unit does not operate.

A How to check inverter/ compressor

Disconnect the terminal of the compressor. 3 minutes after turn- ing on the power supply, start EMERGENCY OPERATION.

Measure the voltage between each lead wire leading to the compressor.

U (BLK) - V (WHT)

V (WHT) - W (RED)

W (RED) - U (BLK)

Is voltage output on right table?

Yes

Is output balanced?

Yes

Is the input voltage to the outdoor electronic control P.C. board 370 V or more?

Yes

Turn off power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals.

Is the resistance between each terminal normal? Yes

Reconnect the lead wire of compressor, and turn on power supply to indoor and outdoor unit.

3 minutes later, starts EMERGENCY OPERATION.

Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor rare short

10 to 60 seconds: compressor lock

60 seconds to 5 minutes: refrigerant circuit defective

5 minutes or more: normal

•After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage.

•The output voltage values have the tolerance of ±20 %.

No Replace the power board.

Replace the compressor.

MUY-D36NA, MUZ-D30NA, U1, MUY-D30NA, MUZ-D36NA specifications

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