Service diagnosis
Domestic air conditioner
10.4.5 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
IPM protection dues to the compressor faulty
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, or
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.
IPM Module is damaged
and needs replacing.
The compressor is started normally,
but malfunctions are reported after it
has run for some time.
1 The system may have been over(like,capillary clogging or electronic expansion valve faulty ) 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.
Test IPM module resistance between P and U,V,W .
Then test IPM module resistance between N and U,V,W.
The resistances range are between 1M
with 10M .and they
are similar.
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