LG ARUV Series Service Manual page 268

Troubleshooting Guide
Error
Error Type
No.
Transmission error between
52
(Inverter PCB
Error diagnosis and countermeasure flow chart
Is transmission
LED (Yellow) of inverter
compressor
PCB on?
Yes
Is transmission cable
connected correctly?
Yes
Is MAIN PCB normal?
Yes
Replace inverter compressor PCB
* The method of checking MAIN PCB and inverter compressor PCB (If normal, transmission LED blinks)
Transmission connector & LED in MAIN PCB
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Only for training and service purposes
Error Point
Main controller can't
receive signal from invert-
Main PCB)
er controller
No
Is noise filter or fuse
normal?
Yes
Replace inverter compressor PCB
No
Re-connect transmission cable
No
Replace MAIN PCB
Transmission connector & LED in inverter compressor PCB
1. Power cable or transmission cable is not
connected
2. Defect of outdoor Main fuse/Noise Filter
3. Defect of outdoor Main / inverter PCB
No
Replace noise filter or fuse
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Main Reasons
LGE Internal Use Only