Humidifier runs but water level in the tank does not drop; no moisture added to room.

Safety: Unplug the humidifier and remove the tank.

Steps:

• Inspect tank cap: Remove the cap and check the valve or gasket for mineral buildup. Soak in white vinegar and clean thoroughly.
• Check for airlock: After refilling, gently tap the tank sides to release trapped air bubbles.
• Seat tank correctly: Reinstall the tank, ensuring it is properly aligned and fully seated on the base so the valve opens.
• Inspect base float: For models with a float, ensure it moves freely and is not stuck in the up position.

Note: Replace the tank cap assembly if the valve does not open reliably after cleaning.