PTAC Service Manual

Service Manual
Installation and Maintenance
70
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.