Haier D Series Service Manual page 39

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