Humidifier is running but no visible mist or humidity increase is observed.

Safety: Unplug before cleaning. Do not immerse the base in water.

• Check water tank: Ensure the tank is full and correctly seated so water flows into the base reservoir.
• Clean transducer: Inspect the ultrasonic disc and clean limescale with vinegar as described in the F2 scenario.
• Clear outlet: Make sure the mist outlet and any directional nozzles are not blocked by dust or mineral deposits.

If there is still no mist and you cannot feel vibration at the transducer when briefly powered, the transducer or driver circuit may be defective and require service.