Toshiba MMU-P0121H Service Manual page 65

Check code
[1d]
Compressor alarm
Is power supply voltage
of outdoor unit normal?
YES
Does voltage reduction occur
when fixed-speed compressor
has been activated?
NO
Is connection of
wiring on IPDU
P.C. board normal?
YES
Is there an abnormal overload?
NO
Is inverter compressor normal?
YES
Is there refrigerant stagnation
in compressor case?
NO
Check IPDU P.C. board.
1. Outdoor unit power supply error
2. Inverter compressor circuit system error
3. Inverter compressor error
4. Inverter compressor refrigerant stagnation
5. Defective IPDU P.C. board
NO
YES
NO
YES
NO
YES
Is inverter winding
output normal?
NO
Check IPDU P.C. board.
3-62
Operation cause
Modify power supply line.
Modify connector of wiring.
Modify cause of overload.
Inverter compressor error
Modify refrigerant stagnation in
YES
compressor case, and start the
operation.