Humidifier displays 'HI' and stops humidifying

Safety: No internal electrical work is needed for basic checks; unplug before opening the housing.

• Check room humidity: Use an external hygrometer to verify actual humidity. If the room is already very humid, the unit is behaving correctly.
• Relocate unit: Move the humidifier away from walls, windows, or direct mist contact with the built-in sensor (often on the top or side of Stadler Form units like Eva).
• Sensor cleaning: Lightly dust the humidity sensor opening with a soft brush. Do not spray cleaners into the sensor.
• Sensor replacement: If the display shows 'HI' in a clearly dry room, the humidity sensor module may be defective and should be replaced.