44
Installation and Maintenance
Service Manual
No.
Malfunction
Name
Display Method of
Indoor Unit
A/C status
Possible Causes
Dual-8
Code
Display
33
Desynchro-
nizing of
compressor
H7
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.
34
PFC
protection
HC
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
Replace outdoor control panel AP1
or Reactor
35
Outdoor DC
fan motor
malfunction
L3
Outdoor DC fan motor
malfunction lead to compressor
stop operation,
DC fan motor malfunction or
system blocked or the connector
loosed
36
power
protection
L9
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
37
Indoor unit
and outdoor
unit doesnt
match
LP
compressor and Outdoor fan
motor cant work
Indoor unit and outdoor unit doesnt
match
38
Failure start-
up
LC
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
Anti-freezing
protection for
evaporator
E2
Not the error code. It’s the
status code for the operation.
40
Undefined
outdoor unit
error
oE
Cool: compressor and outdoor
fan stops operation, while
indoor fan operates; Heat:
compressor, outdoor fan and
indoor fan stop operation.
1. Outdoor ambient temperature
exceeds the operation range of unit
(eg: less than-20oC or more than
60oC for cooling; more than 30oC
for heating);
2. Failure startup of compressor?
3. Are wires of compressor not
connected tightly?
4. Is compressor damaged?
5. Is main board damaged?
41
Malfunction of
phase current
detection
circuit for
compressor
U1
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
42
Malfunction of
voltage
dropping for
DC bus-bar
U3
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Supply voltage is unstable
