31
Installation and Maintenance
Service Manual
9. Maintenance
9.1 Error Code
No.
Malfunction
Name
Display Method of Indoor Unit
A/C Status
Possible Causes
(For specific maintenance method, please refer to the following
procedure of troubleshooting)
Error Code
Indicator lamp
(During blinking, ON for 0.5S
and OFF for 0.5 S)
Operation Lamp
COOL
Lamp
HEAT
Lamp
1
Indoor ambient
temperature
sensor is open/
short- circuited
F1
OFF
3S and
blinks
once
The unit will stop operation
as it reaches the temperature
point. During cooling and drying
operation, except indoor fan
operates, other loads
（
such as
compressor, outdoor fan, 4-way
valve
）
stop operation; During
heating operation, the complete
unit stops operation.
1. The wiring terminal between indoor ambient temperature sensor and
controller is loosened or poorly contacted;
2. There’s short circuit due to trip-over of the parts on controller;
3.Indoor ambient temperature sensor is damaged (Please check it by
referring to the resistance table for temperature sensor)
4. Main board is broken.
2
Indoor evaporator
temperature
sensor is open/
short-circuited
F2
OFF
3S and
blinks
twice
The unit will stop operation
as it reaches the temperature
point. During cooling and drying
operation, except indoor fan
operates, other loads stop
operation; During heating
operation, the complete unit
stops operation.
1. The wiring terminal between indoor evaporator temperature sensor
and controller is loosened or poorly contacted;
2. There’s short circuit due to the trip-over of the parts on controller;
3.Indoor evaporator temperature sensor is damaged (Please check it
by referring to the resistance table for temperature sensor)
4. Main board is broken.
3
Outdoor ambient
temperature
sensor is open/
short-circuited
F3
OFF
3S and
blinks
3
times
The unit will stop operation
as it reaches the temperature
point. During cooling and drying
operation, compressor stops
and indoor fan operates; During
heating operation, the complete
unit stops operation.
1. The wiring terminal between outdoor ambient temperature sensor
and controller is loosened or poorly contacted;
2. There’s short circuit due to the trip-over of the parts on controller;
3.Outdoor ambient temperature sensor is damaged (Please check it by
referring to the resistance table for temperature sensor)
4. Main board is broken.
4
Outdoor
condenser
temperature
sensor is open/
short-circuited
F4
OFF
3S and
blinks
4
times
The unit will stop operation
as it reaches the temperature
point. During cooling and drying
operation, compressor stops
and indoor fan operates; During
heating operation, the complete
unit stops operation.
1. The wiring terminal between outdoor condenser temperature sensor
and controller is loosened or poorly contacted;
2. There’s short circuit due to the trip-over of the parts on controller;
3.Outdoor condenser temperature sensor is damaged (Please check it
by referring to the resistance table for temperature sensor)
4. Main board is broken.
5
Outdoor
discharge
temperature
sensor is open/
short-circuited
F5
OFF
3S and
blinks
5
times
The unit will stop
operation as it reaches the
temperature point. During
cooling and drying operation,
compressor stops and indoor
fan operates; During heating
operation, the complete unit
stops operation.
1. The wiring terminal between outdoor discharge temperature sensor
and controller is loosenedor poorly contacted;
2. There’s short circuit due to the trip-over of the parts on controller;
3. Outdoor discharge temperature sensor is damaged. (Please check it
by referring to the resistance table for temperature sensor)
4. Main board is broken.
