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