Haier 1U50KEPFRA-H Service Manual page 39

10.4.5 IPM protection
Outdoor display: F1 LED1 flash 2 times
Method of
IPM protection is detected by checking the compressor running condition and so on
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
■ IPM protection dues to the compressor faulty
Causes
■ IPM protection dues to faulty PCB of IPM module
■ Compressor wiring disconnected
* Caution:
Trouble
or else parts damage may be occurred
shooting
Electrify the machine
again and turn it on with
the remote control. If
malfunctions are reported
before or upon the
compressor being started
up.
NO
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.
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
Be sure to turn off power switch before connect or disconnect connector,
Test IPM module resistance
between P and U,V,W .
Then test IPM module
YES
resistance between N and
U,V,W.
The resistance ranges
between 1MΩ and 10MΩ and
they are similar.
NO
The outdoor PCB is
damaged. Replace it
with a new one.
39
Service Diagnosis
N
W
V
U
P