46
Installation and Maintenance
Service Manual
9.1 Error Code List
NO.
Malfunction
Name
Display Method of Indoor Unit
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
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including
and bad radiating environment );
Ambient temperature is too high.
2
Antifreezing
protection
E2
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
3
Refrigerant
leakage F0
protection
1.Refrigerant leakage;
2.Indoor evaporator temperature
sensor works abnormally;
3.The unit has been plugged up
somewhere.
4
High
discharge
temperature
protection of
compressor
E4
Please refer to the malfunction
analysis (discharge protection,
overload).
5
Overcurrent
protection
E5
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
Refer to the corresponding
malfunction analysis.
7
High
temperature
resistant
protection
E8
Refer to the malfunction analysis
(overload, high temperature
resistant).
8
EEPROM
malfunction
EE
Replace outdoor control panel AP1
9
Limit/
decrease
frequency
due to high
temperature
of module
EU
Discharging after the complete unit
is de-energized for 20mins, check
whether the thermal grease on
IPM Module of outdoor control
the radiator is inserted tightly.
If its no use, please replace control
panel AP1.
10
Malfunction
protection of
jumper cap
C5
1. No jumper cap insert on
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
9. Maintenance
