Understanding HI: HI can mean the humidity is above the measurable range or the sensor is not reading correctly.

Steps to address HI:

Confirm humidity: Use a separate hygrometer to check actual room humidity. If it is extremely high (near 90–100%), allow the unit to run to bring it down.
Clean intake and sensor: Remove the filter and clean it. Gently clean around the humidity sensor area with a soft brush.
Check sensor connection: Access the control panel and ensure the humidity sensor connector is secure.
Replace sensor: If HI persists in a normal-humidity room, replace the humidity sensor module.
Control board: If a new sensor does not resolve HI, the main control board may be faulty.

Dehumidifier display shows HI for humidity and runs continuously

Possible Causes