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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,
Electrify the machine again and turn it on with
the rem ote controller ,If ma lfunctions are reported
before or upon the compressor being started up.
NO
The com pressor is started nor mally ,
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.
10.3.6 Over-current of the compressor
Outdoor Display:
LED1 flash 3 or 24 or 25 times
Method of
The current of the compressor is too high
Malfunction
Detection
Malfunction
when the IPM Module is damaged
Decision
or the compressor is damaged.
Conditions
power supply voltage is too low or too high
Supposed
■ Faulty IPM Module
Causes
■ Faulty compressor
■ Faulty power supply
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector, or parts
else parts damage may be occurred.
YES
damage may be occurred.
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 1MΩ with 10MΩ.and they
are similar.
NO
IPM Mod ule is damaged
and needs replacing.
32
Installations
or
YES
Domestic air conditioner
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