75
Installation and Maintenance
Service Manual
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
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
11
Gathering
refrigerant
F0
When the outdoor unit receive
signal of Gathering refrigerant
,the system will be forced to
run under cooling mode for
gathering refrigerant
Nominal cooling mode
12
Indoor
ambient
temperature
sensor is
open/short
circuited
F1
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.
13
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
AC stops operation once
reaches the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
1. Loosening or bad contact of
Indoor
evaporator temp. sensor and
mainboard terminal.
2. Components on the mainboard
fall
down leads short circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value
chart for testing)
4. Mainboard damaged.
14
Outdoor
ambient
temperature
sensor is
open/short
circuited
F3
OFF 3S
and
blink
6 times
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
15
Outdoor
condenser
temperature
sensor is
open/short
circuited
F4
OFF 3S
and
blink
5 times
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
16
Outdoor
discharge
temperature
sensor is
open/short
circuited
F5
OFF 3S
and
blink
7 times
During cooling and drying
operation, compressor will sop
after operating for about 3
mins,
while indoor fan will operate;
During heating operation, the
complete unit will stop after
operating for about 3 mins.
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasnt been inserted into the copper
tube
17
Limit/
decrease
frequency
due to
overload
F6
OFF 3S
and
blink
3 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
18
Decrease
frequency
due to
overcurrent
F8
OFF 3S
and
blink
once
All loads operate normally,
while
operation frequency for
compressor is decreased
The input supply voltage is too low;
System pressure is too high and
overload
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
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
19
Decrease
frequency
due to
high air
discharge
F9
OFF 3S
and
blink
twice
All loads operate normally,
while
operation frequency for
compressor is decreased
Overload or temperature is too
high;
Refrigerant is insufcient;
Malfunction of electric expansion
valve (EKV)
20
Limit/
decrease
frequency
due to
antifreezing
FH
OFF 3S
and
blink
4 times
All loads 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 bus-bar
is too high
PH
OFF 3S
and
blink
13 times
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
1. Measure the voltage of position
L and N on wiring board (XT), if the
voltage is higher than 265VAC, 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)
22
Voltage of
DC bus-bar
is too low
PL
OFF 3S
and
blink
12 times
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)
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 nominal cooling or
nominal heating test
25
Compressor
maximum
frequence in
test state
P2
Showing during max. cooling or
max. heating test
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