14.4.23F99 (Output Over Current Detection)

Malfunction Decision Conditions

During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in the inverter DC peak sensing circuitry.

Malfunction Caused

DC peak due to compressor failure.

DC peak due to defective power transistor(s).

DC peak due to defective outdoor unit PCB.

Troubleshooting

Checking the power transistor

Never touch any live parts for at least 10 minutes after turning off the circuit breaker.

If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using the tester.

For the UVW, make measurement at the Faston terminal on the board of the relay connector.

Tester’s negative terminal

Power transistor (+)

UVW

 

Power transistor (-)

UVW

Tester’s positive terminal

UVW

Power transistor (+)

 

UVW

Power transistor (-)

Normal resistance

 

Several kΩ to several MΩ

 

Abnormal resistance

 

 

0 or ∞

 

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