Service manual

69
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
1. Outdoor unit power source error
[1d] 2. Inverter compressor circuit system error
Compressor alarm 3. Inverter compressor error
4. Inverter compressor refrigerant stagnation
5. Defective inverter P.C. board
Is the power source voltage
of the outdoor unit normal?
Is the inverter winding
output normal?
Does voltage reduction occur
when the fixed-speed compressor
has been activated?
Is the connection of
wiring on the inverter
P.C. board normal?
Is there an abnormal overload?
Check inverter P.C. board.
Confirm the power source supply.
Modify connector wiring.
Modify cause of overload.
Compressor error
Modify refrigerant stagnation in
the compressor case, and start the
operation.
Check inverter P.C. board.
No
Yes
Yes
No
No
Yes
Yes
No
Is the inverter compressor normal?
No
Yes
Is there refrigerant stagnation
in the compressor case?
Yes
No
Yes
No