Haier H-MRV Series Service Manual page 182

5. IPM power module protection
9 flashes of outdoor LED302 light.
Possible causes: 1. Short-circuit or overcurrent
2. Control supply is less than 13.5V.
3.Module is hot with a temperature higher than 145° C
Are connectors in light
current board in poor
contact?
yes
Is 9-pin connector between IPM
and low voltage board short-circuit
or in poor contact?
no
Check point: + and - pins of CN201 in
power source board. Is output voltage
of rectifier acceptable (530VDC at
380V)
yes
Check point: CN12 in mainboard.
Is four-way supply voltage less than
13.5V (normal value: 13.5-16.5VDC)
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
Is there any damaged component
in power module driver?
yes
Check low voltage and make
necessary replacement
yes
Check and reconnect
yes
Replace cable
no
Replace rectifiter
yes
Replace power board
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
no
Replace power module driving board
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