3  IPM malfunction or IGBT over-strong current protection 
☆ 
X  P0 
4  Over voltage or too low voltage protection  O  O  P1 
5  Over voltage or too low voltage protection  O 
☆ 
P1 
6  Inverter compressor drive error  X 
☆ 
P4 
7  Inverter compressor drive error 
☆ 
O  P4 
8  Inverter compressor drive error 
☆  ☆ 
P4