7
7
.
.
T
T
R
R
O
O
U
U
B
B
L
L
E
E
S
S
H
H
O
O
O
O
T
T
I
I
N
N
G
G
DC INVERTER AIR CONDITIONER TECHNICAL& SERVICE MANUAL V3.3
110
Fault
code
Fault Description
Possible Reason of Abnormality
How to Deal With
REMARKS
ER
Communication between
main control board
&display board Fault
（displays on display
board）
1.The wiring between the display
board to
the indoor control board connect loose;
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 is failure;
4. The display board is failure;
5. The indoor control board is failure.
1. Reconnect the 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.
NOTE 1:
If the indoor unit can not turn on or the indoor unit turn off itself after 30s, at the same time the unit do
not display the error code, please check the fire and the socket of the control board.
Note 2:
If the indoor unit display 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 exists short circuit.
Note 3:Overload in cooling mode
overload in cooling mode
sr. The root cause
Corrective measure
1
The refrigerant is excessive
Discharge the refrigerant, and recharge the refrigerant refer to the
rating label
2
The outdoor ambient temperature is too high
Please use within allowable temperature range
3
The air outlet and air inlet of the outdoor unit is short-circuit
Adjust the installation of the outdoor unit refer 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 blocked thing
