LG CT09F Service Manual page 127

Part 4 Trouble Shooting
6.7 Troubleshooting Outdoor Error
CH 52 (PCB Communication Error)
Items
Purpose
Condition for Generation
Resetting power source: Wait for 3 minutes after turning the power of the product off.
Items for checking
Resetting
power source
Connector
Check the Heat sink
and Chassis Panel
Replacement of
inverter PCB
Replacement of
main PCB
Checking the communication state between Main PCB and Inverter PCB
Generation of noise source interfering with communication
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Contents
Sub-items for checking
Insufficient insertion
of housing
Checking
power source
※ It should not be short
LED Off
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Damage of
wire coating
Damage of
wire coating