61
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
16
Outdoor
discharge
temperature
sensor is open/
short circuited
F5
OFF
3S and
blink 5
times
OFF
3S and
blink 7
times
During cooling and
drying operation,
compressor will stop
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 hasn’t been
connected well or is
damaged. Please check
it by referring to the
resistance table for
temperature sensor;
2. The head head of
temperature sensor
hasn’t been inserted into
the copper tube
17
Limit/decrease
frequency due
to overload
F6
OFF
3S and
blink
6times
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
8times
OFF
3S and
blink 1
time
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
3S and
blink 9
times
OFF
3S 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
3S and
blink 2
times
OFF
3S and
blink 2
times
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 11
times
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)
