Humidifier displays FL and stops adding moisture, even when the water tank is full.

Safety first: Unplug the humidifier before removing the tank.

Steps to resolve FL:

• Refill tank: Remove the water tank, fill with clean, preferably distilled water, and reinstall it firmly.
• Check tank seating: Ensure the tank is aligned correctly and fully seated so that the valve opens and the float switch is engaged.
• Inspect float: Open the base reservoir and verify that the float moves freely. Clean any mineral deposits or slime that may cause sticking.
• Test level switch: Manually lift the float and listen for a click from the switch. If no click or no response, the water level switch may need replacement.

Note: Some Electrolux humidifiers use a magnetic float and reed switch; ensure the magnet is intact and correctly positioned.