Service diagnosis
37
Domestic air conditioner
Ŷ Faulty IPM Module
Ŷ Faulty compressor
Ŷ Faulty power supply
* Caution
Be sure to turn off power switch before connect or disconnect connector, or parts
damage may be occurred.
10.4.7 The communication fault between IPM and outdoor PCB
Outdoor display:
F3:LED1 flash 4 times
Communication is detected by checking the IPM module and the outdoor PCB
Ŷ
The outdoor PCB broken leads to communication fault
Ŷ
The IPM module broken leads to communication fault
Electrify the machine again and turn it on
with the remote controller, If malfunctions
are reported before or upon the compresso
being started up,
IPM Module is damaged and
needs replacing.
Repair the power supply
the system may have been over or under charged
with gas, which can be judged through the
pressure of the measuring system.
YES
NO
Yes
NO
The compressor is started normally, but
malfunctions are reported after it has
run for some time. Check the powe
supply is too low or too high
NO
Troubleshooti
ng
Supposed
Causes
Method of
Malfunction
Malfunction
Detection
Conditions
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