Haier N-Series Service Manual page 39

10.3.4 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
■ The system leads to IPM protection due to over current
Malfunction
■ The compressor faulty leads to IPM protection
Decision
■ circuit component of IPM is broken and led to IPM protection
Conditions
■ IPM protection dues to the compressor faulty
Supposed
■ IPM protection dues to faulty PCB of IPM module
Causes
■ Compressor wiring disconnected
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
Turn on the unit.
whether the error is displayed before
compressor start?
The compressor
malfunctions are reported after it has run for a
while.
1 The system may have been over or under charged with gas, which can be judged through the pressure of the
measuring system.
2 The shaft of compressor is seized and the compressor needs replacing.
else parts damage may be occurred.
is started normally, but
37
Seivice diagnosis
The power module is fault,
need replaced
Domestic air conditioner
or