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1. Power cable or communication 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 of Master
unit can’t receive signal
from inverter controller
Communication error
between
(Inverter PCB
‘
CYCLE
Main PCB)
52
(521)
n
Error diagnosis and countermeasure flow chart
Is communication
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 communication cable
connected correctly?
Yes
No
Re-connect communication cable
Is CYCLE Main PCB
normal?
Yes
No
Replace CYCLE Main PCB
Replace inverter compressor PCB
* The method of checking CYCLE Main PCB and inverter compressor PCB (If normal, communication LED blinks)
Yes
Fan board
Inverter PCB 1
Inverter PCB 2
Main PCB
Error code check