Humidifier tank shows full, but the unit indicates low water and will not run.

Safety: Unplug the unit and remove the tank.

Steps:

• Check tank valve: Press the valve on the bottom of the tank to ensure it opens smoothly. Replace the valve seal if stuck.
• Inspect float: Locate the float in the base and verify it moves freely. Clean any mineral deposits with vinegar and water.
• Align tank: Reinstall the tank carefully, ensuring it is fully seated and not tilted.
• Test: Plug in and power on. If the low water indication remains, the reed switch or electronic level sensor may be faulty and should be replaced.