>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 l
ow
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
M and - terminals of
electrolytic capacitor. Is output voltage
of rectifier acceptable (310VDC at
220V.)
-173-
Summary of Contents for H-MRV AF092FCBHA
Page 121: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB top layer printed diagram 121 ...
Page 122: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB bottom layer printed diagram 122 ...
Page 127: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA high voltage PCB printed diagram 127 ...
Page 131: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA low voltage PCB printed diagram 131 ...
Page 152: ... a__WcU S c a V e a Wc AB092 182FCBHA PCB printed diagram 152 ...
Page 156: ... a__WcU S c a V e a Wc AE FCBKA PCB printed diagram 156 ...
Page 199: ...MEMO Commercial Air Conditioner ...