Haier 1U68WEGFRA Service Manual page 38

10.3.5 IPM protection
Outdoor display: LED1 flash 2 times
Method of IPM protection is detected by checking the compressor running condition and so on
Malfunction
Detection
Malfunction ■ The system leads to IPM protection due to over current
Decision ■ The compressor faulty leads to IPM protection
Conditions ■ circuit component of IPM is broken and led to IPM protection
Supposed ■
●
Causes ■ IPM protection dues to faulty PCB of IPM module
■ Compressor wiring disconnected
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
NO
IPM protection dues to the compressor faulty
else parts damage may be occurred.
YES
Outdoor PCB is damaged
and needs replacing
36
Service diagnosis
NO
Domestic air conditioner
or
YES