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
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
System block or
refrigerant leakage
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
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
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.
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
deenergized 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.
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