20
No.
Malfunction
Name
Dual-8
Code
Display
Operation
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
AC Status Possible Causes
16
Outdoor
disc harge
temperature
sensor is
open/short
circuited
F5
OFF 1S
and blink
7times
During cooli ng and drying
operation, compressor s tops
after operating for about 3
mins, while indoor fan
operates. During heating
operation, the compl ete unit
stops after 3 mins.
1.Outdoor temperature sens or has
not been connected well or is
damaged. Check it by referring to
the resistance table for
temperature sensor)
2.The head of temperature sensor
has not been inserted into the
copper tube
17
Limit/ decrease
frequency due to
overload
F6
OFF 1S
and blink
3times
All loads operate normally,
while operation frequency for
compressor is decreased
Refer to the malfunction analys is
(overload, high temperature
resistant)
18
Decrease
frequency due to
over-current
F8
OFF 1S
and blink
once
All loads operate normally,
while operation frequency for
compressor is decreased
The input suppl y voltage is too
low. System pressure is too high.
19
Decrease
frequency due to
high air
disc harge
F9
OFF 1S
and blink
twice
All modes operate normally ,
while operation frequency for
compressor is decreased
Temperature is too high;
Malfunction of electric expansion
valve (EKV)
20
Limit/ decrease
frequency due to
anti freezing
FH
OFF 1S
and blink
4times
All modes operate normally ,
while operation frequency for
compressor is decreased
Poor air-return in indoor unit or fan
speed is too low
21
Voltage for DC is
too high
PH
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
unit stops operation.
1. Measure the voltage on
terminals L2 and S on terminal
block, if the voltage is higher than
265VAC, turn on the unit
2. If the AC input is normal,
measure the vol tage of electrolytic
capacitor C on control panel (AP1)
if its normal, there is a malfunction
in the circuit, replace the control
panel (AP1)
22
Voltage of DC is
too low
PL
During cooli ng and drying
operation, compressor will
stop whil e indoor fan will
operate; During heating
operation, the compl ete unit
will stop
1. Measure the voltage of position
L2 and S on terminal block, if the
voltage is hi gher than 150VAC,
turn on the unit.
2. If the AC input is normal,
measure the vol tage of electrolytic
capacitor C on control panel
(AP1), if normal, there is a
malfunction on the circuit, replace
the control panel (AP1)
23
Compressor Min
frequence in test
state
P0
Showing during min. cooling or
min. heating test
24
Compressor
rated frequence
in test state
P1
Showing during nomi nal cool ing or
nominal heating test
25
Compressor
maximum
frequence in test
state
P2
Showing during middle c ooling or
middle heating test
26
Compressor
intermediate
frequence in test
state
P3
Showing during middle c ooling or
middle heating test
27
Overcurrent
protection of
phase c urrent for
compressor
P5
During cooli ng and drying
operation, compressor s tops
while indoor fan operates;
During heating operation, the
unit stops operation.
Refer to the malfunction analys is
(IPM protection, lo ss of
synchronism protecti on and over
current protection of phase current
for compressor.
28
Charging
malfuncti on of
capaci tor
PU
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
complete unit stops.
Refer to the part three—charging
malfunction analys is of capacitor
29
Malfuncti on of
module
temperature
sensor circuit
P7
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
complete unit stops.
Replace outdoor c ontrol panel AP1
30
Module high
temperature
protection
P8
During cooli ng 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 , ensure the
thermal grease on IPM Module of
AP1 i s sufficient. If not, replace
control panel AP1.
31
Decrease
frequency due to
high temperature
resistant during
heating
operation
H0
All modes operate normally ,
while operation frequency for
compressor is decreased
Refer to the malfunction analys is
(overload, high temperature
resistant)
32
Static de-dusting
protection
H2
33
Overload
protection for
compressor
H3
OFF 1S
and blink
8times
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
complete unit stops operation.
1. Wiring terminal OVC-COMP i s
loosened. In normal state, the
resistanc e for this terminal should
be less than 1ohm.
2.Refer to the malfuncti on analys is
(discharge protection, overload)
34
System is
abnormal
H4
OFF 1S
and blink
6times
During cooli ng and drying
operation, compressor s tops
while indoor fan operates.
During heating operation, the
complete unit stops operation.
Refer to the malfunction analys is
(overload, high temperature
resistant)
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