Mitsubishi MSZ-HC35VA Service Manual download pdf (Page 31)

11-5. TROUBLESHOOTING FLOW

Are the voltages balanced?

Disconnect the connector (CN61) between

compressor and the intelligent power module

(IPM).

Replace the inverter P.C. board.

Check the voltage between terminals.

Check the compressor.

See 11-5. “Check of compressor”.

Yes

See 11-5. “Check of open phase”.

● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if

the inverter is normal by measuring the balance of voltage between the terminals.

Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)

<< Operation method>>

Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-

TION : Refer to 8-3.)

<<Measurement point>>

At 3 points

BLK (U)-WHT (V)

BLK (U)-RED (W)

WHT(V)-RED (W)

NOTE : 1. Output voltage varies according to power supply voltage.

2. Measure the voltage by analog type tester.

3. During this check, LED of the inverter P.C. board ﬂ ashes 9 times. (Refer to 11-6.1.)

B Check of open phase

A How to check inverter/compressor

Measure AC voltage between the lead wires at 3 points.

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Mitsubishi MSZ-HC35VA Service Manual Page 31