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16.2 Unit Troubleshooting
Symptom
The unit does not start
Air flows normally but
doesn't cool
The unit starts or
stops frequently
Low cooling effect
Low heating effect
Possible causes
A power cut has occurred (the power to the premis-
es has been cut-off).
The unit is powered off.
The power switch fuse may have burned out.
The remote controller's batteries are dead.
The temperature setting is not correct.
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.
Doors or windows are open.
Sunlight is shining directly onto the unit.
The room contains many heat sources such
as computers or refrigerators.
The unit's air filter is dirty.
The outside temperature is unusually high.
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.
Doors or windows are not completely closed.
Arrange for a professional technician to check the following:
A refrigerant leak has occurred.
Troubleshooting steps
Wait for the power to come back on.
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 cann't 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 the doors and windows.
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.
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