Humidifier or dehumidifier display shows "Hi" for humidity and does not run as expected.

Safety: Normal operation can usually continue; no internal access is required for basic checks.

• Check environment: Verify the unit is not placed directly under a steam source or in a confined, saturated space. Move it to a more open area.
• Sensor placement: Ensure the humidity sensor opening is not directly in the mist plume of a humidifier. Reposition the unit if necessary.
• Dry out sensor: Turn the unit off and allow it to sit in a dry room for several hours to let the sensor recover.
• Replace sensor: If "Hi" remains regardless of room conditions, replace the humidity sensor module with a Medisana-compatible part.