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9.2
Faults that are not displayed
Symptom
Possible causes
The unit does not start
A power blackout has occurred (the power to the premises
has been cut-off).
The unit is powered off.
The power switch fuse may have blown.
The remote controller's batteries are dead.
Air flows normally but
The temperature setting is not correct.
doesn't cool
The unit starts or stops
Arrange for a professional technician to check the following:
frequently
• Too much or too little refrigerant.
• No gas in the refrigerant circuit.
• The outdoor unit compressors have malfunctioned.
• The power supply voltage is too high or too low.
• There is a blockage in the piping system.
Low cooling effect
Sunlight is shining directly onto the unit.
The room contains many heat sources such as computers or
refrigerators.
The air filter of the unit is dirty.
The outside temperature is unusually high.
Engage a professional air conditioning engineer to check the following:
• The heat exchanger of the unit is dirty.
• The air inlet or outlet of the unit is blocked.
• A refrigerant leak has occurred.
Low heating effect
Doors or windows are not completely closed.
Arrange for a professional technician to check the following:
• A refrigerant leak has occurred.
When the outdoor temperature is very low, the heating
capacity will decrease gradually.
Table 12
Air Flux – 6721876663 (2023/12)
Troubleshooting steps
Wait for the power to come back on.
Power on the unit. The indoor unit forms part of an air
conditioning system that has multiple indoor units that are all
connected. The indoor units cannot be powered on
individually - they are all connected to one, single power
switch. Ask a professional technician for advice regarding
how to safely power on the units.
Replace the fuse.
Replace the batteries.
Set the desired temperature on the remote controller.
Close shutters/blinds to shield the unit from direct sunlight.
Turn off some of the computers during the hottest part of the
day.
Clean the filter.
The cooling capacity of the system reduces as the outdoor
temperature rises and the system may not provide sufficient
cooling if the local climate conditions are not considered
when the system's outdoor units were selected.
Close doors and windows.
It is recommended to use other heating devices for heating
together.
Troubleshooting
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