Service Manual
40
Installation and Maintenance
9. Maintenance
9.1 Error Code List
No.
Malfunction
Name
Display
Method
of Indoor
Unit
A/C Status
Possible Causes
Maintenance measures
Nixie
tube
display
1
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;
Refer to Malfunction
Detection Flowchart
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.
2
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;
Refer to Malfunction
Detection Flowchart
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.
3
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;
Refer to Malfunction
Detection Flowchart
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.
