LG ATNH09GRLE2 Svc Manual page 125

4. Trouble Shooting
6.7 Troubleshooting Outdoor Error
CH 52 (PCB Communication Error)
Insufficient insertion of wires
OK
Damage of wire coating
: Interference with wires or wire coating damage with chopping
Inverter PCB LED
: Replacement of inverter PCB during LED Off after resetting
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