Haier Z/N-Series Service Manual page 56

11.4.5 IPM protection
Outdoor display: LED1 flash 2 times
Method of IPM protection is detected by checking the compressor running condition and so on
Malfunction
Detection
Malfunction ■ The system leads to IPM protection due to over current
Decision ■ The compressor faulty leads to IPM protection
Conditions ■ circuit component of IPM is broken and led to IPM protection
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 remote controller,If malfunctions
are reported before or upon the compressor
being started up,
The compressor
malfunctions are reported after it has run for some
time.
1 The system may have been over 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.
else parts damage may be occurred.
is started normally, but
54
Service diagnosis
IPM Module is damaged and
needs replacing.
Malfunction unsolved
Domestic air conditioner
or