Haier AU282AHBEA Service Manual page 302

12) IPM power module protection
Possible causes: 1. Short-circuit or overcurrent
2.Control power supply is less than 13.5V.
3.Module is overheat with a temperature higher than 145° C.
Confirm the module
failure according to the
fault code list
yes
check if there is bad
connection in electric
circuit
yes
check if outdoor motor is normal(in
cooling, not running or speed too
low, or not stop in heating)
no
Measure + and - terminals of
electrolytic capacitor. Is output voltage
of rectifier acceptable (310VDC at
220V.)
yes
Check if the four-way power supply
voltage of PCB is less than 13.5V
(normal value: 15VDC)
no
if the compressor is normal
yes
Is power module too hot?
no
Is current up to protection
limit of power module?
no
1.Is output voltage among U, V and W balanced?
2.Disconnect all terminals. Is resistance between P
and N; P and U, V, W; N and U, V, W acceptable?
yes
Check mainboard and make
necessary replacement
yes
Check and reconnect
1.Replace outdoor motor
yes
or fan capacitor
2.Replace PCB
no
Replace rectifiter or
electrolytic capacitor
yes
Replace PCB
Is compressor winding resistance
no
acceptable? Is it stuck?
yes
Is silica gel well distributed on radiation fins?
1.Is voltage of supply circuit too low?
yes
2.Is heat exchanger or indoor fan motor broken?
3.Is ambient temperature too high? Is system
overloaded?
no
Replace power module
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Replace compressor