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110 PB
TROUBLESHOOTING
Diagnostic Codes
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
1 High
Pressure
Protectioon
Of System
E1 OFF 3s
and blink
once
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation.
During heating operation, the
complete unit stops.
Possible reasons:
1.Refrigerant was super‑
abundant;
2.Poor heat exchange
(including filth blockage of
heat exchanger and bad
radiating environment );
Ambient temperature is
too high.
2 Antifreezing
protection
E2 OFF 3s
and blink
twice
OFF 1 s
and blink 3
times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates.
1.Poor air‑return in indoor
unit;
2.Fan speed is abnormal;
3.Evaporator is dirty.
3 In Defect of
refrigerant
F0 OFF 1 s
and blink 9
times
The Dual‑8 Code Display will
show F0 and the complete
unit stops.
1.In defect of refrigerant;
2.Indoor evaporator
temperature sensor works
abnormally;
3. The unit has been
plugged up somewhere.
4 High
Discharge
temperaature
protection of
compressor
E4 OFF 3s
and blink 4
times
OFF 1s
and blink 7
times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
Please refer to the malfunc‑
tion analysis (discharge
protection, overload).
5 Overcurrent
protection
E5 OFF 3s
and blink 6
times
OFF 1s
and blink 5
times
During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation, the
complete unit stops.
1. Supply voltage is unstable;
2. Supply voltage is too low
andload is too high;
3. Evaporator is dirty.
6 Communica‑
tion malfunc‑
tion
E6 OFF 3s
and blink 6
times
Always on During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation,
the complete unit stops.
Refer to the corresponding
malfunction analysis.
7 High
temperature
resistant
prtoection
E8 OFF 3s
and blink 8
times
OFF 1s
and blink 6
times
During cooling operation:
compressor will stop while
indoor fan will operate.
During heating operation, the
complete unit stops.
Refer to the malfunction
analysis (overload, high
temperature resistant).
8 EEPROM
malfunction
EE OFF 3s
and blink
15 times
OFF 1s
and blink
11 times
During cooling and drying op‑
eration, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
Replace outdoor control
panel AP1
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