Fault
code
Fault Description
Possible Reason
s
f
or
Abnormality
How to Deal With
Remarks
FE(254)
Communication
between main control
board &Wiring remote
controller Fault
（
display on wiring
remote controller
）
ER
Communication
between main control
board &display board
Fault
（
displays on
display board
）
NOTE 1:
If the indoor unit can not turn on or the indoor unit turns off itself after 30s, at the same time the
unit does not display the error code, please check the fire and the socket of the control board.
N
OTE
2:
If the indoor unit displays the 75,76,77,78 error code after you turn on the unit, please check the
TEST seat of the indoor control board or the TEST detection circuit whether short circuit exists.
N
OTE
3:
Overload in cooling mode
Overload in cooling mode
sr.
The root cause
Corrective measures
1
The refrigerant is excessive
Discharge the refrigerant, and recharge the refrigerant
referring to the rating label
2
The outdoor ambient temperature is too high
Please use it within allowable temperature range
3
Short-circuit occurs in the air outlet and air
inlet of the outdoor unit
Adjust the installation of the outdoor unit referring to
the user manual
4
The outdoor heat exchanger is dirty, such as
condenser
Clean the heat exchanger of the outdoor unit, such as
condenser
5
The speed of the outdoor fan motor is too low
Check the outdoor fan motor and fan capacitor
6
The outdoor fan is broken or the outdoor fan is
blocked
Check the outdoor fan
7
The air inlet and outlet has been blocked
Remove the obstacles
8
The expansion valve or the capillary fails
Replace the expansion valve or the capillary
1. The wired controller and the
indoor control board are
connected loosely.
2. The sequence of the wiring
between the wired controller
to the indoor control board is
wrong;
3. The wiring between the
wired controller to the indoor
control board fails;
4. The wired controller fails;
5. The indoor control board
is abnormal.
1.
2.
Reconnect the wiring between
the wired controller to the
indoor control board;
Replace the wiring between
the wired controller to the
indoor control board;
3. Replace the wiring between
the wired controller to the
indoor control board;
4. Replace the wired controller;
5. Replace the indoor control
Board.
1.The wiring between the display
board to the indoor control
board is connected loosely;
2.The sequence of the wiring
between the display board to the
indoor control board is wrong;
3.The wiring between the display
board to the indoor control
board fails;
4.The display board fails;
5.The indoor control board fails.
1. Reconnect the wiring
between the display board
to the indoor control board;
2. Replace the wiring between
the display board to the
indoor control board;
3. Replace the wiring between
the display board to the
indoor control board;
4. Replace the display board;
5. Replace the indoor control
board.
15. TROUBLESHOOTING
56
