Humidifier runs but produces little or no mist; water level does not drop.

Safety: Unplug the humidifier before cleaning. Do not touch the transducer while powered.

Steps:

• Tank check: Ensure the water tank is full and properly seated so the valve opens.
• Descale transducer: For ultrasonic Sharp models, gently clean the metal transducer disc with a cotton swab and white vinegar to remove mineral scale. Rinse and dry.
• Replace wick: For evaporative models, replace the wick filter if it is hard, discolored, or has heavy mineral buildup.
• Fan check: Verify the internal fan runs; if not, inspect and replace the fan motor.
• Electronics: If the transducer remains inactive after cleaning, the driver circuit on the PCB may be faulty; replace the main control PCB or transducer module.