47
Installation and Maintenance
Service Manual
9. Maintenance
No.
Malfunction
Name
Error
Code
A/C Status Possible Causes
7
WIFI
communication
malfunction
JF
Loads operate normally, while the unit can’t
be normally controlled by APP.
1. Main board of indoor unit is damaged;
2. Detection board is damaged;
3. The connection between indoor unit and detection board
is not good;
8
Communication
malfunction
E6
During cooling operation,
compressor stops while indoor fan motor
operates. During heating operation, the
complete unit stops.
Refer to the corresponding malfunction analysis.
9
Overload
malfunction
E8 The entire unit stops.
1. Indoor and outdoor heat exchanger is too dirty?
Or air inlet/outlet is blocked?
2. Fan motor doesn't work at a normal fan speed;fan speed
is too low or the fan doesn't run.
3. Compressor operates normally or not? Is there any
abnormal noise or oil leak? Casing is too hot?
4. System is blocked inside? (Dirt blockage? Ice blockage?
Oil blockage? Y-valve is not fully open?)
5. Main board temperature sensor detects wrongly.
10
Overload
protection for
compressor
H3
During cooling and drying
operation, compressor will stop while indoor
fan will operate; During heating operation,
the complete unit will stop operation.
1. Wiring terminal OVC-COMP is loosened. In normal state,
the resistance for this terminal should be less than 1ohm.
2.Refer to the malfunction analysis ( discharge protection,
overload)
11
In defect of
refrigerant
F0
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.
12
Indoor ambient
temperature
sensor is open/
short-circuited
F1
The unit will stop operation as it reaches the
temperature point. During cooling and drying
operation, except IDU fan motor operates,
other loads stop operation; During heating
operation, the heating fan motor operates
according to the conditions of blowing
residual heat.
1. The wiring terminal between indoor ambient temperature
sensor and maiboard is loosened or poorly contacted;
2. There’s short circuit due to trip-over of the parts on
maiboard;
3. Indoor ambient temperature sensor is damaged (Please
check it by referring to the resistance table for temperature
sensor);
4. Mainboard is broken.
13
Indoor
evaporator
temperature
sensor is open/
short-circuited
F2
The unit will stop operation as it reaches the
temperature point. During cooling and drying
operation, except IDU fan motor operates,
other loads stop operation; During heating
operation, the heating fan motor operates
according to the conditions of blowing
residual heat.
1. The wiring terminal between indoor evaporator
temperature sensor and maiboard is loosened or poorly
contacted;
2. There’s short circuit due to trip-over of the parts on
maiboard;
3. Indoor evaporator temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor);
4. Mainboard is broken.
14
Outdoor
ambient
temperature
sensor is open/
short-circuited
F3
The unit will stop operation as it reaches
the temperature point. During cooling and
drying operation, the compressor stops
operation while IDU fan motor operates;
During heating operation, the heating fan
motor operates according to the conditions
of blowing residual heat.
1. The wiring terminal between outdoor ambient temperature
sensor and maiboard is loosened or poorly contacted;
2. There’s short circuit due to trip-over of the parts on
maiboard;
3. Outdoor ambient temperature sensor is damaged (Please
check it by referring to the resistance table for temperature
sensor);
4. Mainboard is broken.
15
Outdoor
condenser
temperature
sensor is open/
short-circuited
F4
The unit will stop operation as it reaches the
temperature point. During cooling and drying
operation, the compressor stops operation
while IDU fan motor operates; During heating
operation, the heating fan motor operates
according to the conditions of blowing
residual heat.
1. The wiring terminal between outdoor condenser
temperature sensor and maiboard is loosened or poorly
contacted;
2. There’s short circuit due to trip-over of the parts on
maiboard;
3. Outdoor condenser temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor);
4. Mainboard is broken.
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