User Guide

5. Trouble Shooting
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GND
INPUT(CT)
< Inverter PCB>
< CT Sensing Check Point >
1
2
3
Vdc
52
Transmission error
between (Inverter PCB ➔
Main PCB)
Main controller of Master
unit of Master unit canʼt
receive signal from
inverter controller
1. Power cable or transmission cable is not
connected
2. Defect of outdoor Main fuse/Noise Filter
3. Defect of outdoor Main / inverter PCB
Display
code
Title Cause of error Check point & Normal condition
■ Error diagnosis and countermeasure flow chart
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
Yes