>a__WcU[S^ <[c >a`V[e[a`Wc
no
Replace rectifiter
yes
Check point: CN12 in mainboard.
Is four-way supply voltage less than
13.5V (normal value: 13.5-16.5VDC)
yes
Replace power board
no
if the compressor is normal
no
Is compressor winding resistance
acceptable? Is it stuck?
yes
Is power module too hot?
yes
Is silica gel well distributed on radiation fins?
no
Is current up to protection
limit of power module?
yes
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?
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
Replace power module
yes
Check mainboard and make
necessary replacement
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.
5. IPM power module protection
Are connectors in low
voltage PCB in poor
contact?
Is 10-pin connector between IPM
and mainboard short-circuit or in
poor contact?
Replace cable
yes
yes
Check and reconnect
yes
no
Measure + and - terminals of
electrolytic capacitor. Is output voltage
of rectifier acceptable (310VDC at
220V.)
-173-
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