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112 PB
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
Power
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
14 outdoor
ambient
temperature
sensor is
open/ short
circuted
F3 OFF 3s
and blink
3 times
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
circuted
F4 OFF 3s
and blink
4 times
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
circuted
F5 OFF 3s
and blink
for 5
times
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 sen‑
sor 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 fre‑
quency due to
overload
F6 OFF 3s
and blink
for 6
times
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 fre‑
quency due to
overcurrent
F8 OFF 3s
and blink
8 times
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 3s
and blink
9 times
OFF 1s
and blink
twice
All loads operate normally,
while
operation frequency for
compressor is decreased
Overload or temperature is
too high; refrigerant is insuf‑
ficent Malfunction of electric
expansion valve (EKV)
20 limit/
decrease fre‑
quency due to
antifreezing
FH OFF 3s
and blink
2 times
OFF 3s
and blink 2
times
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
TROUBLESHOOTING
Diagnostic Codes
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