Haier AB36NACBEA Service Manual page 96

10.3 Malfunction and Solution of Wired controller
1) There is nothing on display of wire control organ, and the air-conditioner failure to
operate
check the port row of Y
power supply
redo the
connection work
replacing the
transformer
if power supply and
communication line are
connected correctly
N if the transform of
PCB.socket is normal
Y
if there's AC 15V on
N
transformer subside
of indoor unit PCB.
82
begining
if the diode on indoor
unit is lumines
Y
'
if there s voltage
on the primary side
of tranaformer
Y
if there's AC 220V
N
of power suplay on
PCB. of indoor unit
Y
N
if the fuse of indoor
unit PCB.is normal
Y
if the primary side of
power supply
transformer is short
Y
replacing the transformer
Figure 9-3
if there'e DC 12V
between the four
Y
ports:A,B,C and D which
on wire control organ
Y
repacing the wire
control organ
N
replacing the PCB.
of indoor unit
N