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Troubleshooting
CAUTIONS
If one of the following conditions occurs, switch off the power supply immediately and contact your dealer for further
assistance.
•
The operation light continues to flash rapidly after the unit has been restarted.
•
The remote control buttons do not work.
•
The unit continually trips fuses or circuit breakers.
•
A foreign object or water enters the air conditioner.
•
The indoor unit leaks.
Common Problems
The following symptoms are not a malfunction and in most situations will not require repairs.
Problem
Possible Causes
Unit does not turn on
when pressing ON/
OFF button
The unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be
restarted within three minutes of being turned off.
Cooling and Heating Models: If the Operation light and PRE-DEF (Pre-heating/Defrost) indicators are lit
up, the outdoor temperature is too cold and the unit’s anti-cold wind is activated in order to defrost the
unit.
In Cooling-only Models: If the “Fan Only” indicator is lit up, the outdoor temperature is too cold and
the unit’s anti-freeze protection is activated in order to defrost the unit.
The unit changes from
COOL mode to FAN
mode
The unit changes its setting to prevent frost from forming on the unit. Once the temperature increases,
the unit will start operating again.
The set temperature has been reached, at which point the unit turns off the compressor. The unit will
resume operating when the temperature fluctuates again.
The indoor unit emits
white mist
In humid regions, a large temperature difference between the room’s air and the conditioned air can
cause white mist.
Both the indoor and
outdoor units emit
white mist
When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture
generated from the defrosting process.
The indoor unit makes
noises
A squeaking sound is heard when the system is OFF or in COOL mode. The noise is also heard when
the drain pump (optional) is in operation.
A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction
of the unit’s plastic parts.
Both the indoor unit
and outdoor unit
make noises
A low hissing sound may occur during operation. This is normal and is caused by refrigerant gas
flowing through both the indoor and outdoor units.
A low hissing sound may be heard when the system starts, has just stopped running or is defrosting.
This noise is normal and is caused by the refrigerant gas stopping or changing direction.
The outdoor unit
makes noises
The unit will make different sounds based on its current operating mode.
Troubleshooting
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