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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)
30
EEPROM
malfunction
EE
OFF 3S
and blink
15 times
ƶ ƶ ƶ Ƶ
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
31
Charging
malfunction
of capacitor
PU
OFF 3S
and blink
17 times
ƶ Ƶ ƶ Ƶ
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop Refer to the part three—charging
malfunction analysis of capacitor
32
Malfunction
of module
temperature
sensor circuit
P7
OFF 3S
and blink
18 times
ƶ ƶ Ƶ ƿ
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
33
Module high
temperature
protection
P8
OFF 3S
and blink
19 times
Ƶ ƶ ƿ Ƶ
During cooling operation,
compressor will stop while
indoor fan will operate; During
heating operation, the complete
unit will stop After the complete unit is de-
energized for 20mins, check
whether the thermal grease on
IPM Module of outdoor control
whether the radiator is inserted
tightly. If its no use, please replace
control panel AP1.
34
Malfunction
of voltage
dropping for
DC bus-bar
U3
OFF 3S
and blink
20 times
ƶ Ƶ Ƶ Ƶ
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop Supply voltage is unstable
35
Voltage of
DC bus-bar
is too low
PL
OFF 3S
and blink
21 times
ƶ Ƶ Ƶ ƶ
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop 1. Measure the voltage of position
L and N on wiring board (XT), if
the voltage is higher than 150VAC,
turn on the unit after the supply
voltage is increased to the normal
range.
2.If the AC input is normal,
measure the voltage of electrolytic
capacitor C on control panel (AP1),
if its normal, theres malfunction
for the circuit, please replace the
control panel (AP1)
36
Limit/
decrease
frequency
due to high
temperature
of module
EU Ƶ Ƶ Ƶ ƿ
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
whether the radiator is inserted
tightly.
If its no use, please replace control
panel AP1.
37
The four-way
valve is
abnormal
U7
Ƶ ƶ ƿ ƶ
If this malfunction occurs during
heating operation, the complete
unit will stop operation. 1.Supply voltage is lower than
AC175V;
2.Wiring terminal 4V is loosened
or broken;
3.4V is damaged, please replace
4V.
38
Zero-
crossing
malfunction
of outdoor
unit
U9
Ƶ Ƶ ƿ ƶ
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation. Replace outdoor control panel
AP1
39
Limit/
decrease
frequency
due to
antifreezing
FH
Ƶ Ƶ Ƶ ƶ
All loads operate normally, while
operation frequency for
compressor is decreased Poor air-return in indoor unit or fan
speed is too low