LG MULTI V IV ARNU07GTU 2 Series Service Manual page 55

Trouble shooting guide
1. The phenomena from main component failure ..............................55
2. Checking Method for Key Components ..........................................56
2.1 Compressor ........................................................................................56
2.2 Fan Motor ............................................................................................57
2.3 Electronic Expansion Valve...............................................................58
2.4 Phase Bridge Diode Checking Method ............................................61
2.5 Inverter IPM Checking Method ................................................................62
2.6 Fan IPM Checking Method(UX3 chassis) ...............................................63
2.7 Fan IPM Checking Method(UX2 chassis) ...............................................64
2.8 Pressure Sensor(High/Low Pressure Sensor) ......................................65
2.9 Outdoor Fan .............................................................................................65
2.10 Solenoid Valve .......................................................................................66
2.11 Reverse Valve.........................................................................................67
2.12 Temperature Sensor ..............................................................................67
2.13 Others .....................................................................................................68
3. Self-diagnosis function .................................................................69
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