Haier N Series Service Manual page 55

. .5 IPM protection
Outdoor display:
Method of
malfunction detection
Malfunction detection
conditions
Conditions
Supposed
Causes
Troubleshooting
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.
LED1 flash 2 times
IPM protection is detected by checking the compressor running condition and so on
■ The system leads to IPM protection due to over current
■ The compressor faulty leads to IPM protection
■ circuit component of IPM is broken and led to IPM protection
■ IPM protection dues to the compressor faulty
■ IPM protection dues to faulty PCB of IPM module
■ Compressor wiring disconnected
* Caution Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
Electrify the machine again and turn it on
with the remote controller,If malfunctions
are reported before or upon the compressor
being started up,
The compressor is started
malfunctions are reported after it has run for some
time.
normally, but
Service diagnosis
IPM Module is damaged and
needs replacing.
Malfunction unsolved
Domestic air conditioner
or