Humidifier (Danby) runs but no visible mist or humidity increase

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

• Step 1 – Check water tank: Ensure the tank is full, properly capped, and seated correctly on the base so that the valve opens.
• Step 2 – Clean transducer: For ultrasonic Danby humidifiers, gently clean the metal transducer disc with a cotton swab and white vinegar to remove mineral deposits. Do not scratch the surface.
• Step 3 – Inspect mist outlet: Make sure the mist nozzle and outlet are not blocked by dust or scale. Clean with a soft brush.
• Step 4 – Use distilled water: Hard water can quickly foul the transducer. Switch to distilled or demineralized water to prevent recurrence.
• Step 5 – Control check: Verify that the humidity setpoint is above the current room humidity and that any child lock is disabled.

When to call a technician: If the transducer does not vibrate or the fan does not run despite correct setup, the control board or transducer module may need replacement.