Haier AB28NACBEA - Page 93

3 Malfunction and Solution of Wired controller
1) There is nothing on display of wire control organ, and the air-conditioner failure to
operate
if the diode on indoor
unit is lumines
if there
'
s voltage
on the primary side
of tranaformer
if the fuse of indoor
unit PCB.is normal
if the primary side of
power supply
transformer is short
replacing the transformer
check the port row of
power supply
if the transform of
PCB.socket is normal
replacing the
transformer
redo the
connection work
if power supply and
communication line are
connected correctly
replacing the PCB.
of indoor unit
if there'e DC 12V
between the four
ports:A,B,C and D which
on wire control organ
begining
Y
Y
if there's AC 220V
of power suplay on
PCB. of indoor unit
Y
repacing the wire
control organ
Y
N
Y
Y
Y
N
N
Y
N
N
if there's AC 15V on
transformer subside
of indoor unit PCB.
N
Y
Figure 7-3
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