Humidifier powers on but produces no mist

Safety: Unplug the humidifier and empty the tank before inspection.

Steps:

• Check tank: Ensure the water tank is full, the cap is tight, and the tank is properly seated on the base so that water flows into the reservoir.
• Inspect transducer: Remove the tank and look at the ultrasonic transducer in the base. Clean any white mineral deposits with a vinegar-dampened cotton swab, then rinse.
• Test operation: Refill and reinstall the tank, then power on. Look for ripples or fine bubbles at the transducer surface. If none, the transducer or driver may be faulty.
• Replace transducer: Replace the ultrasonic transducer assembly with a compatible Bionaire part. If mist still does not form, the main control PCB likely needs replacement.