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4.
Troubleshooting
CAUTION
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.
• Other abnormal situations
Common Issues
The following problems are not a malfunction and, in most situations, will not require repairs.
Issue
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 continue 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. Thia ia normal and is caused by refrigerant
gas flowing through both 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.
