LG MULTI V M ARNU07GTU 4 Series Svc Manual page 38

Trouble shooting guide
1. The phenomena from main component failure ..............................39
2. Checking Method for Key Components ..........................................40
2.1 Compressor ........................................................................................40
2.2 Fan Motor ............................................................................................41
2.3 Electronic Expansion Valve...............................................................42
2.4 Phase Bridge Diode Checking Method ............................................45
2.5 Inverter IPM Checking Method ................................................................46
2.6 Pressure Sensor(High/Low Pressure Sensor) ......................................47
2.7 Outdoor Fan .............................................................................................47
2.8 4 way Valve...............................................................................................48
2.9 Temperature Sensor ................................................................................48
3. Self-diagnosis function .................................................................19
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