Haier H-MRV Series Service Manual page 173

5. IPM power module protection
9 flashes of outdoor ALARM light, fault readout:9
Possible causes: 1. Short-circuit or overcurrent
2.Four-way control supply (15VDC) is less than 13.5V.
3.Module is hot with a temperature higher than 145° C.
Are connectors in low
voltage PCB in poor
contact?
yes
Is 10-pin connector between IPM
and mainboard short-circuit or in
poor contact?
no
Measure + and - terminals of
electrolytic capacitor. Is output voltage
of rectifier acceptable (310VDC at
220V.)
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 no
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
yes
Replace cable
no
Replace rectifiter
yes
Replace power board
Is compressor winding resistance
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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