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5. IPM power module protection
9 flashes of outdoor ALARM light.
Possible causes: 1. Short-circuit or overcurrent
1.Four-way control supply (15VDC) is less than 13.5V.
2.Module is hot with a temperature higher than 145° C.
Replace rectifier
no
no
yes
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
no
Are CN1 and CN2 in
mainboard in poor contact?
Check and reconnect
Is 10-pin connector between IPM
and mainboard short-circuit or in
poor contact?
Replace cable
Is output voltage of rectifier
acceptable (310VDC at 220V. Less
than 250V when running at high
frequency.)
Check point: CN2 in mainboard.
Is four-way supply voltage less than
13.5V (normal value: 13.5-16.5VDC)
Replace PCB
Is compressor in good condition?
no
Is compressor winding resistance
acceptable? Is it blocked?
Is power module too hot?
Is silica gel well distributed on radiation fins?
Is current up to
protection limit of
power module?
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?
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?
Check mainboard and make
necessary replacement
Replace power module
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