23
Installation and Maintenance
Service Manual
9. Maintenance
9.2 Flashing LED Primary Judgement
No.
Malfunction
Name
Display Method
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Indicator
Cool
Indicator
Heat
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
filth blockage of heat exchanger
and bad radiating environment );
Ambient temperature is too high.
2
Anti-freezing
protection for
evaporator
E2
OFF 3S
and blink
twice
Not the error code. It’s the status
code for the operation.
3
System block or
refrigerant
leakage
E3
OFF 3S
and blink
3 times
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
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
Communication
Malfunction
E6
OFF 3S
and blink
6
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 panel AP1
is sufficient and whether the radiator is
inserted tightly.
If its no use, please replace control
panel AP1.
