Service Manual
Installation and Maintenance
25
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement
No.
Malfunction
Name
Display Method of Indoor Unit
Display Method of Outdoor Unit
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF 0.5s
Operation
Indicator
Cool
Indicator
Heat
Indicator
Yellow
Indicator
Red
Indicator
Green
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
Antifreezing
protection
E2
OFF 3S
and blink
twice
OFF 1S
and blink
3 times
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
OFF 3S
and blink
3 times
OFF 1S
and blink
9 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
OFF 1S
and blink
7 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
OFF 1S
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
OFF
During cooling
operation,compressor
stops while indoor
fan motor operates.
During heating
operation, the
complete unit stops.
Refer to the
corresponding
malfunction analysis.
