Hisense AUD-18UX4SGKL Service Manual page 77

Dc inverter air conditioner
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7.TROUBLE SHOOTING
and the indoor
control
board
fault
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
sr.
The root cause
1
The refrigerant is excessive
2
The outdoor ambient temperature is too high
The air outlet and air inlet of the outdoor unit is
3
short-circuit
The outdoor heat exchanger is dirty, such as
4
condenser
5
The speed of the outdoor fan motor is too low
The outdoor fan is broken or the outdoor fan is
6
blocked
7
The air inlet and outlet has been blocked
8
The expansion valve or the capillary is failure
Note 4:Over load in heating mode
sr.
The root cause
1
The refrigerant is excessive
2
The indoor ambient temperature is too high
The air outlet and air inlet of the indoor unit is
3
short-circuit
4
The indoor filter is dirty
5
The speed of the indoor fan motor is too low
The indoor fan is broken or the outdoor fan is
6
blocked
7
The air inlet and outlet has been blocked
8
The expansion valve or the capillary is failure
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.
overload in cooling mode
Overload in heating mode
board;
3. Replace the wiring
display board to the indoor control
board;
4. Replace the display board;
5. Replace the indoor control board.
Corrective measure
Discharge the refrigerant, and recharge the
refrigerant refer to the rating label
Please use within allowable temperature range
Adjust the installation of the outdoor unit refer to
the user manual
Clean the heat exchanger of the outdoor unit,
such as condenser
Check the outdoor fan motor and fan capacitor
Check the outdoor fan
Remove the blocked thing
Replace the expansion valve or the capillary
Corrective measure
Discharge the refrigerant, and recharge the
refrigerant refer to the rating label
Please use within allowable temperature range
Adjust the installation of the indoor unit refer to
the user manual
Clean the indoor filter
Check the indoor fan motor and fan capacitor
Check the indoor fan
Remove the blocked thing
Replace the expansion valve or the capillary
between the

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