Abnormal sounds are produced during operation

A buzzing sound

A buzzing sound may be produced when the flap moves

A rattling/creaking sound

A rattling/creaking sound is produced may be produced when the flap position is adjusted during operation startup or stopping

A bubbling sound

• When the room is completely closed and the ventilation fan is operating or when strong winds are blowing outside, outdoor air can enter the drain hose and cause bubbling sound
• This phenomenon tends to occur in a well-sealed house or apartment

A soft rumbling sound

• Check if the unit is operating in ventilation (fan) mode
• The unit can produce a soft rumbling sound when it is operating in ventilation (fan) mode

A strange sound is produced during humidifying or ventilation operation

Hissing sound

• The hissing sound is caused by the discharge of humidified or ventilated air
• A different sound may be produced depending on the outdoor temperature or humidity

Bubbling

• The bubbling sound comes from inside of the the humidifying hose
• When the outside humidity is low, Manual Mould Proof operation may improve the situation
• If that does not produce any improvement, contact your dealer

A strange sound is produced during humidifying operation

• The sound is produced when the humidifying fan starts or stops operating
• Sound generated outside may be transmitted to the air conditioner unit

A hissing or crackling sound is produced

• This is not a malfunction of the unit
• The hissing or crackling sound is produced by Streamer discharge.