Haier 1U50KEPFRA-H, Руководство по обслуживанию

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Service Diagnosis
39
10.4.5 IPM protection
Outdoor display: F1 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,
or else parts damage may be occurred
Supposed
Causes
Malfunction
Decision
Conditions
Method of
Malfunction
Detection
Trouble
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.
Test IPM module resistance
between P and U,V,W .
Then test IPM module
resistance between N and
U,V,W.
The resistance ranges
between 1MΩ and 10MΩ and
they are similar.
YES
U
V
W
P
N
NO
The compressor is
started normally, but
malfunctions are
reported after it has
run for some time
NO
The outdoor PCB is
damaged. Replace it
with a new one.
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.