Service Manual
Installation and Maintenance
39
9. Maintenance
9.1 Error Code
No.
Malfunction Name
Error Code
A/C Status
Possible Causes
1
Indoor ambient
temperature sensor
is open/short-
circuited
F1
The unit will stop
operation as it reaches the
temperature point.
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
The unit will stop
operation as it reaches the
temperature point.
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
F4
The unit will stop
operation as it reaches the
temperature point.
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
low temperature
prevention
protection
FP
A/C enters into pure
electric heating mode, and
low temperature protection
is started up.
1.Indoor ambient temperature is lower than 40°F(5°C)
continuously.;
2.Indoor ambient temperature sensor is damaged;
3.Main board is broken.
