Service Manual
Installation and Maintenance
30
No.
Malfunction
Name
Display Method of Indoor Unit
Display Method of Outdoor
Unit
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Operation
Indicator
Cool
Indicator
Heat
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
25
Compressor
rated
frequence in
test state
P1
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during
nominal cooling or
nominal heating test
26
Compressor
maximum
frequence in
test state
P2
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON 0.25s
and OFF
0.25s)
Showing during max.
cooling or
max. heating test
27
Compressor
intermediate
frequence in
test state
P3
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during
middle cooling or
middle heating test
28
Overcurrent
protection of
phase
current for
compressor
P5
OFF 3S
and blink
15 times
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate;During
heating operation, the
complete unit will stop
operation.
Refer to the
malfunction
analysis (IPM
protection, loss
of synchronism
protection and
overcurrent
protection of phase
current for
compressor.
29
Charging
malfunction
of capacitor
PU
OFF 3S
and blink
17 times
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate;During
heating operation, the
complete unit will stop
Refer to the part
three—charging
malfunction analysis
of capacitor
30
Malfunction
of module
temperature
sensor circuit
P7
OFF 3S
and blink
18 times
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate;During
heating operation, the
complete unit will stop
Replace outdoor
control panel AP1
