LG AS-W1863 Series Svc Manual page 76

Troubleshooting Guide
When compressor does not oprate normally.
Trouble 8-2
I Communication error between Indoor and Outdoor (Error Code ➄)
Does the operating LED in display PCB
Ass'y blink 5 times?
Is the voltage of BR/BK, RD AC220/240V in
Main PCB Ass'y.
Is the connection of CN-T/Block and in
CN-AC/DC indoor P.C.B Ass'y is right?
Replace the PCB Ass'y.
• Main PCB Ass'y (Indoor/Outdoor)
• Control Box Ass'y.
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YES
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• Check the state of connecting cable
(3 line) bewteen indoor and outdoor unit .
• Check Fuse, Noise Filter, PTC, etc.
• Electrical wiring diagram(Colors)
• Check the connecting state
of connectors in outdoor PCB Ass'y
• Check the Fuse of outdoor PCB Ass'y.
• Reconnect the connectors.
• Check the PCB pattern(Resoldering).
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