Humidifier displays F1 and stops or will not start misting.

Safety: Turn off and unplug the humidifier before removing the tank.

Steps:

• Check water tank: Remove the tank, fill it to the proper level, and reinstall it firmly. Ensure it is aligned with any guide rails or switches.
• Inspect float: In the base, locate the water level float (often a small plastic piece that rises with water). Make sure it moves freely and is not coated with scale or slime. Clean with mild vinegar solution if needed.
• Sensor check: Some Tosot humidifiers use a magnetic float and reed switch. Verify the magnet is intact and the float is not waterlogged.
• Replace sensor: If F1 persists with a full, correctly seated tank and free-moving float, the water level sensor or reed switch may be defective and should be replaced.