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15.2 Unit troubleshooting
S
y
m
p
o t
m
The unit does not start
Air flows normally
but doesn't cool
The unit starts or
stops frequently
Low cooling effect
Low heating effect
P
o
s s
b i
e l
c
a
u
s
s e
A power cut has occurred (the power to the
premises 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 comp ressors have malfunctioned.
The power supply voltage is too high or too low.
There is a blockage in the piping system.
D
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r o
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Sunlight is shining directly onto the unit.
The room contains many heat sources such as
computers or refrigerators.
T
h
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i n
s ' t
a
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t l i f
r e
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d
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. y t
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.
T
o r
u
b
e l
s
h
o
t o
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 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.
C
o l
s
e
h t
e
d
o
Close shutters/blinds to shield the unit from direct
sunlight.
Turn off some of the computers during the hot test part
of the day.
C
e l
a
n
h t
e
l i f
e t
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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