LG ATNH09GRLE2 Svc Manual page 124

6.7 Troubleshooting Outdoor Error
CH 52 (PCB Communication Error)
Items
Purpose
Condition for Generation Generation of noise source interfering with communication
Items for checking
Resetting
power source
Connector
Check the Heat sink
and Chassis Panel
Replacement of
inverter PCB
Replacement of
main PCB
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Checking the communication state between Main PCB and Inverter PCB
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Contents
Sub-items for checking
Insufficient insertion
of housing
Checking
power source
LED Off
4. Trouble Shooting
Damage of
wire coating
Damage of
wire coating
LGE Internal Use Only