English 34
White mist comes out of the unit
Indoor unit
● When humidity is high during cooling operation.
If the interior of indoor unit is extremely contaminated, the temperature distribution inside a room becomes uneven. It is necessary to clean the
interior of the indoor unit. Ask your Daikin dealer for details on cleaning the unit. This operation requires a qualied service person.
● Immediately after the cooling operation stops and if the room temperature and humidity are low.
This is because warm refrigerant gas ows back into the indoor unit and generates steam.
Noise of air conditioners
Indoor unit
● An electric starting sound is heard immediately after the power supply is turned on.
The electronic expansion valve inside an indoor unit starts working and makes the noise. Its volume will reduce in about 1 minute.
● A continuous low sigh sound is heard when the system is in cooling operation or at a stop.
When the drain pump (an optional accessory) is in operation, this noise is heard.
● A squeaking sound is heard when the system stops after heating operation.
Expansion and contraction of plastic parts caused by temperature change make this noise.
● A low sighing sound is heard while the indoor unit is stopped.
When the other indoor unit is in operation, this noise is heard. In order to prevent oil and refrigerant from remaining in the system, a small
amount of refrigerant is kept owing.
Outside unit
● When the tone of operating noise changes.
This noise is caused by the change of frequency.
Indoor unit, outside unit
● A continuous low hissing sound is heard when the system is in cooling.
This is the sound of refrigerant gas owing through both indoor and outside units.
● A hissing sound which is heard at the start or immediately after stopping operation.
This is the noise of refrigerant caused by ow stop or ow change.
Dust comes out of the unit
● When the unit is used after stopping for a long time.
This is because dust has gotten into the unit.
The units can give o odors
● During operation.
The unit might absorb the smell of rooms, furniture, cigarettes, etc., and then emit it again.
The compressor in the outside unit does not stop
● This is to prevent oil and refrigerant from remaining in the compressor. The unit will stop after 5 to 10 minutes.
The inside of outside unit is warm even when the unit has stopped
● This is because the crankcase heater is warming the compressor so that the compressor can start smoothly.
Hot air is emitted even though the unit is stopped
● Hot air can be felt when the unit is stopped.
Several dierent indoor units are being run on the same system, so if another unit is running, some refrigerant will still ow through the unit.
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