60
Fault Displays
9,000 and 12,000 btuh units
No.
Malfuntiuon
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
0.5ws and OFF 0.5s
Operation
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
12
Indoor
ambient
temperature
sensor is open/
short circuited
F1
OFF
3S and
blink 1
time
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
OFF
3S and
blink
twice
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 cirtui; 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 3
times
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 hasn’t been
connected well 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 4
times
OFF
3S and
blink 5
times
During cooling and
drying operating,
compressor stops while
indoor fan operates;
During heating
operation, the complete
unit will stop operation
Outdoor temperature
sensor hasn’t been
connected well or is
damaged. Please check
it by referring to the
resistance table for
temperature sensor
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