Service Manual
Installation and Maintenance
32
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
36
IPM
protection
H5
OFF 3S
and blink
5 times
OFF 1S
and blink
4 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.
37
Module
temperature
is too high
H5
OFF 3S
and blink
5 times
OFF 1S
and blink
10 times
38
Internal motor
(fan motor) do
not operate
H6
OFF 3S
and blink
11 times
Internal fan motor,
external fan motor,
compressor and
electricheater stop
operation,guide
louver stops at
present location.
1. Bad contact of
DC motor feedback
terminal.
2. Bad contact of DC
motor control end.
3. Fan motor is
stalling.
4. Motor malfunction.
5. Malfunction of
mainboard rev
detecting circuit.
39
Desynchronizing
of compressor
H7
OFF 3S
and blink
7 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.
40
PFC
protection
HC
OFF 3S
and blink
6 times
OFF 1S
and blink
14 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
