7URXEOHVKRRWLQJ
Display Method of Indoor Unit
Indicator Display (during blinking,
ON 0.5s and OFF 0.5s)
Display Method of
Outdoor Unit
Indicator has 3 kinds of
display status and they
will be displayed
circularly every 5s.
Ƒ
OFF
Ŷ
ON
ƿ
Blink
No.
Malfunction
Name
Dual-8
Code
Display
Operation
Indicator
COOL
Indicator
Heating
Indicator
D40
D41 D42 D43
A/C status
Possible Reasons
1
High pressure
protection of
system
E1
OFF 3s
and blink
once
Ƒ
ƿ
ƿ
ƿ
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
Ŷ
Ƒ
Ŷ
Ƒ
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
High discharge
temperature
protection of
compressor
E4
OFF 3S
and blink 4
times
Ŷ
Ƒ
Ŷ
ƿ
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).
4
Overcurrent
protection
E5
OFF 3S
and blink 5
times
Ƒ
Ŷ
ƿ
Ƒ
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.
5
Communication
Malfunction
E6
OFF 3S
and blink 6
times
Ƒ
Ƒ
Ƒ
ƿ
During cooling operation,
compressor stops while indoor fan
motor operates. During heating
operation, the complete unit stops.
Refer to the corresponding malfunction analysis.
6
High
temperature
resistant
protection
E8
OFF 3S
and blink 8
times
Ŷ
Ƒ
Ŷ
Ŷ
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).
7
Circuit PG motor
(indoor fan) has
circuit
malfunction by
zero cross
detection
U8
OFF 3S
and blink
for 17
times
Operation of remote controller or
control panel is available, but the
unit won’t act.
1. Control board is damaged.
8
PG motor
(indoor fan
motor) does not
operate
H6
OFF 3S
and blink
11 times
The complete unit will stop
operation.
Poor connection for PGF in circuit diagram;
Malfunction of indoor unit’s control panel AP1;
Malfunction of indoor unit’s motor M1.
9
Malfunction
protection of
jumper cap
C5
OFF 3S
and blink
15 times
The complete unit will stop
operation.
Poor connection for the jumper cap on indoor unit’s
control panel AP1; please reinsert or replace the
jumper cap;
10
Indoor ambient
temperature
sensor is
open/short
circuited
F1
OFF 3S
and blink
once
During cooling and drying
operation, indoor unit operates
while other loads will stop; during
heating operation, the complete
unit will stop operation.
1.Room temperature sensor hasn’t been connected
well with indoor unit’s control panel AP1 (refer to the
wiring diagram for indoor unit);
2.Room temperature sensor is damaged (please
refer to the resistance table of temperature sensor)
11
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
OFF 3S
and blink
twice
During cooling and drying
operation, indoor unit will operate
while other loads will stop; During
heating operation, the complete
unit will stop operation.
1.Room temperature sensor hasn’t been connected
well with indoor unit’s control panel AP1 (refer to the
wiring diagram for indoor unit);
2.Room temperature sensor is damaged (please
refer to the resistance table of temperature sensor)
Blinking
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