LG Single "A" Service Manual page 106

6.22 Check code Trouble shooting CH52
Display
Title
code
Transmission error
between (Inverter PCB ➔
52
Main PCB)
I 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
Check Point
- Check the Transmission connector and LED (Main & Inverter)
42/48/60k
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Only for training and service purposes
Cause of error
Main controller of Master
unit of Master unit can't
receive signal from
inverter controller
No
Is noise filter or fuse
normal?
Yes
Replace inverter compressor PCB
No
Re-connect transmission cable
No
Replace MAIN PCB
<Inverter PCB>
Check point & Normal condition
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
- 105 -
5. Trouble Shooting
<MAIN PCB>
LGE Internal Use Only