Haier AB092ACBHA, Service Manual

Page: 302 / 365

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Check mainboard and make
necessary replacement
yes
Replace 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?
no
1.Is voltage of supply circuit too low?
2.Is heat exchanger or indoor fan motor broken?
3.Is ambient temperature too high? Is system
overloaded?
yes
Is current up to protection
limit of power module?
no
Is silica gel well distributed on radiation fins?
yes
Is power module too hot?
yes
Is compressor winding resistance
acceptable? Is it stuck?
no
if the compressor is normal
no
Replace PCB
yes
Check if the four-way power supply
voltage of PCB is less than 13.5V
(normal value: 15VDC)
yes
Replace rectifiter or
electrolytic capacitor
no
M and - terminals of
electrolytic capacitor. Is output voltage
of rectifier acceptable (310VDC at
220V.)
no
yes
Check and reconnect
yes
yes 1.Replace outdoor motor
or fan capacitor
2.Replace PCB
check if outdoor motor is normal(in
cooling, not running or speed too
low, or not stop in heating)
Confirm the module
failure according to the
fault code list
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.
yes
check if there is bad
connection in electric
circuit
Replace compressor
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