Toshiba HFC R407C Service Manual page 44

Diagnostic procedure for check code
Check code
[1d]
Compressor error alarm
Refer to outdoor unit
Is the power source voltage of the
outdoor unit normal?
Yes
Does voltage reduction occur
when the fixed-speed compressor
has been activated?
No
Is the connection of wiring on
the IPDU PC board normal?
Yes
Is there an abnormal overload?
No
Is the inverter compressor normal?
Yes
Is there refrigerant stagnation
in the compressor case?
No
Check IPDU PC board.
44
Troubleshooting
Status of air conditioner
Operation stops
No
Yes
No
Yes
No
Yes
Is the inverter winding
output normal?
Check IPDU PC board.
Operation cause
1. Outdoor unit power source error.
2. Inverter compressor circuit system error.
3. Inverter compressor error.
4. Inverter compressor refrigerant stagnation.
5. Defective IPDU PC board.
Yes
No
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.