99
PB
TROUBLESHOOTING
Error Codes
No. Malfunction Name Error
Code
A/C Status
Possible Causes
1
Indoor ambient
temperature
sensor is open/
shortcircuited
F1
The unit will not operate.
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 is a 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)(15k at 77°F)
4.Main board is broken.
2
Indoor evaporator
temperature
sensor is open/
shortcircuited
F2
Up and down buttons will be
locked. 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 is a 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) (20k
ohms at 77°F).
4.Main board is broken.
3
Outdoor tube
temperature
sensor
is open/
shortcircuited
F4
Unit will not operate.
Up and down buttons will be
locked.
The unit will stop operation as it
reaches the temperature point.
1.The wiring terminal between outdoor tube
temperature sensor and controller is loosened or
poorly contacted;
2.There is a short circuit due to the trip-over of the
parts on controller;
3.Outdoor tube sensor is damaged (Refer to the
resistance table for temperature sensor) (20k
ohms at 77°F).
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.
4. (Refer to the resistance table for temperature
sensor) Check thermistor resistance 15k ohms at
77°F
5
Air outlet
temperature
sensor
FJ
Panel control:
The display displays error code
(it is not displayed in unit off
status, but error LED is displayed).
All loads except indoor fan are
turned off under cooling mode;
all loads stop immediately under
heating mode and indoor fan
blows residual heat for 6s at set
fan speed. Wired controller: no
respond Unit will not operate.
Evaporator High temperature
above 136°F for 1 minute. Will
reset at 126°F.
1. Temperature sensor terminal at air outlet is
loose.
2. There is a foreign object on control board, which
causes short circuit.
3. Temperature sensor at air outlet is broken.
4. Mainboard 1 is broken.
5. (Refer to the resistance table for temperature
sensor) Check thermistor resistance 50k ohms at
77°F.
6. Dirty coil
7. Fan motor failure.
