28
Installation and Maintenance
Service Manual
9. Maintenance
No.
Malfunction
Name
Display Method
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heat
Indicator
35
IPM
protection
H5
OFF 3S
and blink
5 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.
36
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.
37
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.
38
PFC
protection
HC
OFF 3S
and blink
6 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
39
Outdoor DC
fan motor
malfunction
L3
OFF 3S
and blink
23 times
Outdoor DC fan motor
malfunction lead to compressor
stop operation,
DC fan motor malfunction or
system blocked or the connector
loosed
40
power
protection
L9
OFF 3S
and blink
20 times
compressor stop operation and
Outdoor fan motor will stop 30s
latter , 3 minutes latter fan motor
and compressor will restart
To protect the electronical
components when detect high
power
41
Indoor unit
and outdoor
unit doesn't
match
LP
OFF 3S
and blink
19 times
compressor and Outdoor fan
motor can’t work
Indoor unit and outdoor unit doesn't
match
42 Failure startup
LC
OFF 3S
and blink
11 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
