56
Installation and Maintenance
Service Manual
9. Maintenance
9.1 Error Code List
No.
Malfunction
Name
Display Method of Indoor Unit
A/C status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
operation
Indicator
Cool
Indicator
Heating
Indicator
1
High
pressure
protection of
system
E1
During cooling and drying
operation, except indoor fan operates, all
loads stop operation.
During heating operation, the complete unit
stops.
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including filth
blockage of heat exchanger and bad radiating
environment );
Ambient temperature is too high.
2
Antifreezing
protection
E2
During cooling and drying
operation, compressor and
outdoor fan stop while indoor fan operates.
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
3
In defect of
refrigerant
F0
The Dual-8 Code Display will show F0 and
the complete unit stops.
1. In defect of refrigerant;
2. Indoor evaporator temperature sensor
works abnormally;
3. The unit has been plugged up
somewhere.
4
High
discharge
temperature
protection of
compressor
E4
During cooling and drying
operation, compressor and
outdoor fan stop while indoor fan operates.
During heating
operation, all loads stop.
Please refer to the malfunction analysis
(discharge protection, overload).
5
Overcurrent
protection
E5
During cooling and drying
operation, compressor and
outdoor fan stop while indoor fan operates.
During heating
operation, all loads stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and load is too
high;
3. Evaporator is dirty.
6
Communi-
cation
Malfunction
E6
During cooling operation,
compressor stops while indoor fan motor
operates. During heating operation, the
complete unit stops.
Refer to the corresponding malfunction
analysis.
7
High
temperature
resistant
protection
E8
During cooling operation:
compressor will stop while indoor fan will
operate. During heating operation, the
complete unit stops.
Refer to the malfunction analysis (overload,
high temperature resistant).
8
EEPRoM
malfunction
EE
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
9
Limit/
decrease
frequency
due to high
temperature
of module
EU
All loads operate normally, while
operation frequency for
compressor is decreased
Discharging after the complete unit is de-
energized for 20mins, check whether the
thermal grease on
IPM Module of outdoor control panel AP1 is
sufficient and whether the radiator is inserted
tightly.
If its no use, please replace control panel
AP1.
10
Malfunction
protection of
jumper cap
C5
Wireless remote receiver and
button are effective, but can
not dispose the related
command
1. No jumper cap insert on
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
