- 80 -
Error code check
Error number
Errors
Meaning
Main cause of occurrence
57
(571)
Communication error :
CYCLE Main PCB
÷
Inverter PCB
Failing to receive
inverter signal at main
PCB of Outdoor Unit
1. Bad Connection Between Inv and Main
2. Communication Wire Noise Effect
3. CYCLE Main PCB Damage
4. Inv PCB Damage
n
Failure diagnosis method
Are there any
communication wire
connections normal?
Is inverter PCB
assembly
normal?
Is there any error
when power reset?
Recheck power and
installation condition
1. Check communication wiring conditions
2. Check connector conditions
→
Rewire them if abnormality found.
1. Replace Inverter PCB
1. Replace CYCLE Main PCB
No
No
No
Yes
Yes
Yes
Communication
LED
Communication
LED
Communication
LED
Communication LED
Fan board
Inverter PCB 1
Inverter PCB 2
Main PCB
※
In case where a wire connector terminal has a contact defect and is inserted incompletely, be sure to turn off
the outdoor unit power circuit breaker and then reset the power when confirming.