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NO.
Malfunction
Name
Display Method of Indoor Unit
Display Method of
Outdoor Unit
(Indicator has 3 kinds
of display status and
they will be displayed
circularly every 5s.)
A/C status Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
□OFF
■Illuminated
ƿ
Blink
Operation
Indicator
Cool
Indicator
Heating
Indicator
D5
(D40)
D6
(D41)
D16
(D42)
D30
(D43)
1
High
pressure
protection of
system
E1
OFF 3s
and blink
once
ƶ 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
and bad radiating environment );
Ambient temperature is too high.
2
Antifreezing
protection
E2
OFF 3S
and blink
twice
Ƶ ƶ Ƶ ƶ
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
Ƶ ƶ Ƶ 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
ƶ Ƶ ƿ ƶ
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
Communi-
cation
Malfunction
E6
OFF 3S
and blink 6
times
ƶ ƶ ƶ 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
Ƶ ƶ Ƶ Ƶ
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
Internal
motor (fan
motor) do not
operate
H6
OFF 3S
and blink
11 times
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present location.
1. Bad contact of DC motor
feedback terminal.
2. Bad contact of DC motor
control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
8
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.
9
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. Loosening or bad contact of
indoor ambient temp. sensor and
mainboard terminal.
2. Components in mainboard fell
down leads short circuit.
3. Indoor ambient temp. sensor
damaged.(check with sensor
resistance value chart)
4. Mainboard damaged.
10
Overcurrent
protection of
phase
current for
compressor
P5
OFF 3S
and blink
15 times
ƶ ƿ ƶ ƶ
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation. Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.