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.
Replace the batteries.
The temperature setting is not correct.
Low cooling effect
Doors or windows are open.
Close the doors and windows.
The unit's air filter is dirty.
Clean the filter.
Low heating effect
Close doors and windows.
14.2 Unit Troubleshooting
Air flows normally but
doesn’t 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.
Turn off some of the computers during the hottest part
of the day.
The outside temperature is unusually high.
19
A
power
cut
has
occurred
(the
power
of
the
premises has been cut-off).
The
remote
control
batteries
are dead.
Arrange
for
a
professional
technician to
check
out 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.
Sunlight
is
shining directly
onto the unit.
Close
shutters/blinds
to
shield
the
unit from
direct sunlight.
The cooling capacity of the system will decrease
as the outdoor temperature rises, and if the
local climatic conditions are not considered
when selecting the outdoor unit of the system, the
system may not be able to provide sufficient cooling.
Doors
or
windows
are not
completely closed.
Arrange
for
a
professional
technician to
check out
the following:
A
refrigerant
leak
has
occurred.
Set the desired
temperature on the remote
control.
Arrange for a professional
air
conditioning technician
to
check out
the following:
The unit's
heat
exchanger
is
dirty.
The unit's
air
inlet or
outlet
is
obstructed.
A
refrigerant
leak
has
occurred.
