49
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
No. Malfunction Name
Display Method of
Indoor Unit
A/C status
Possible Causes
Dual-8 Code
Display
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
Low pressure
protection of system
E3
The Dual-8 Code Display will show E3 until the
low pressure switch stop operation.
1.Low-pressure protection
2.Low-pressure protection of system
3.Low-pressure protection of compressor
3
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).
4
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.
5
Communication
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.
6
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).
7
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
8
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 it's no use, please replace control panel AP1.
9
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.
10
Gathering refrigerant
Fo
When the outdoor unit receive signal of Gathering
refrigerant ,the system will be forced to run under
cooling mode for gathering refrigerant
Nominal cooling mode
