36
Installation and Maintenance
Service Manual
13
Communi-
cation
malfunction
E6
During cooling operation, compressor
stops while indoor fan motor operates.
During heating operation, the
complete unit stops.
1. The communication line is not connected tightly or poorly
contacted.
Poor contact of any line may cause communication
malfunction.
2. The match between main board and display panel is
incorrect. Indoor and outdoor unit boards are matched
incorrectly.
3. Incorrect wire connection.
4. Controller is damaged.
14
Overload
malfunction
E8
The entire unit stops.
1. Indoor and outdoor heat exchanger is too dirty?
Or air inlet/outlet is blocked?
2. Fan motor doesn't work at a normal fan speed; fan speed
is too low or the fan doesn't run.
3. Compressor operates normally or not? Is there any
abnormal noise or oil leak? Casing is too hot?
4. System is blocked inside? (Dirt blockage? Ice blockage?
Oil blockage? Y-valve is not fully open?)
5. Main board temperature sensor detects wrongly.
15
Overload
protection for
compressor
H3
The entire unit stops.
1. Outdoor and indoor heat exchangers are too dirty or the
air inlet/outlet is blocked.
2. Fan motor doesn't work at a normal fan speed; fan speed
is too low or the fan doesn't run.
3. Compressor doesn't work normally. Strange noise or
leakage occurs. Temperature of the shell is too high.
4. System is blocked inside(dirt block, ice block, oil block,
Y-valve not fully open).
5. High pressure switch is abnormal
6. The refrigerant is leaking and cause overheating
protection to compressor
16
Lack of
refrigerant
or block
protection for
the system
or Overload
protection
compressor
F0
The Dual-8 Code Display will show
F0 and the complete unit stops.
1.Refrigerant leakage;
2.Indoor evaporator temperature sensor works abnormally;
3.The unit has been plugged up somewhere;
4.The compressor can’t be started up normally. Because
the power voltage for the complete unit is too low, and the
outdoor working condition is too high.
17 Defrosting
Heating indicator
off for 0.5s and
then blinks for
10s
Not the error code. It’s the status
code for the operation.
