54
Installation and Maintenance
Service Manual
9. Troubleshooting
9.1 Flashing LED of Indoor/Outdoor Unit and Primary Judgement
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
OFF 3s
and blink
once
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
and bad radiating environment );
Ambient temperature is too high.
2
Antifreezing
protection
E2
OFF 3S
and blink
twice
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
OFF 3S
and blink
4 times
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
OFF 3S
and blink
5
times
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
OFF 3S
times
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
OFF 3S
and blink
8
times
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
OFF 3S
and blink
15 times
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
OFF 3S
and blink
6 times
OFF 3S
and blink
6 times
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
the radiator is inserted tightly.
If its no use, please replace control
panel AP1.
10
Malfunction
protection of
jumper cap
C5
OFF 3S
and blink
15 times
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.
36
