No.
Malfunction Name
Dual-
8 Code
Display
Display Method of Outdoor Unit
A/C status
Possible Causes
Indicator has 3 kinds of display
status and during blinking, ON
0.5s and OFF 0.5s
Yellow
Indicator
Red
Indicator
Green
Indicator
11
Gathering
refrigerant
Fo
OFF 1s
and blink
17 times
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 1s
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 1s
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 1s
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 1s
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 1s
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
19
Decrease
frequency due to
high air discharge
F9
OFF 1s
and blink
twice
All loads operate normally,while
operation frequency for
compressor is decreased
Overload or temperature is too
high;
Refrigerant is insufficient;
Malfunction of electric expansion
valve (EKV)
20
Limit/decrease
frequency due to
antifreezing
FH
OFF 1s
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
Service Manual
7
8
Installation and Maintenance
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