Haier AU422XIBAA Service Manual page 88

3) There is nothing on display of remote control organ, and the air-conditioner failure
to operate
check the port row of
power supply
redo the
connection work
replacing the
transformer
if power supply and
Y
communication line are
connected correctly
if the transform of
N
PCB.socket is normal
if there's AC 13V on
N
transformer subside
of indoor unit PCB.
if the diode on indoor
unit is lumines
if there's AC 220V
N
of power suplay on
PCB. of indoor unit
N
if the fuse of indoor
unit PCB.is normal
Y
if the primary side of
power supply
transformer is short
replacing the transformer
Figure 7-4
begining
Y
'
if there s voltage
on the primary side
of tranaformer
Y
Y
Y
Y
N
replacing the PCB.
of indoor unit