Symptom
Possible causes
Troubleshooting steps
The unit does not start
Wait for the power to come back on.
The unit is powered off.
The power switch fuse may have burned out.
Replace the fuse.
The remote controllers batteries are dead.
Replace the batteries.
The temperature setting is not correct.
Set the desired temperature on the remote controller.
Arrange for a professional technician to check the following:
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
Doors or windows are open.
Close the doors and windows.
Sunlight is shining directly onto theunit.
The unit's air filter is dirty.
Clean the filter.
Engage a professional air conditioning engineer to check the following:
The unit's heat exchanger is dirty.
The unit's air inlet or outlet is blocked.
A refrigerant leak has occurred.
Low heating effect
Doors or windows are not completely closed.
Close doors and windows.
Arrange for a professional technician to check the following:
A refrigerant leak has occurred.
15.2 Unit Troubleshooting
A power cut has occurred (the power to the
premises has been cut-off).
Air flows normally but
doesnt cool
The unit starts or
stops frequently
Power on the unit. This 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.
The room contains many heat sources such
as computers or refrigerators.
Close shutters/blinds to shield the unitfrom direct
sunlight.
Turn off some of the computers during the hottest part
of the day.
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.
The outside temperature is unusually high.
42
