Dehumidifier display shows HI and may not control humidity properly

Safety first: If the unit feels excessively hot or smells of burning, unplug immediately.

• Step 1 – Verify environment: Check that the room temperature is within the unit’s specified range (typically up to 35°C / 95°F). In very hot rooms, HI may simply indicate extreme conditions.
• Step 2 – Improve ventilation: Ensure the dehumidifier has at least 12–16 inches clearance on all sides and is not in a confined closet or small enclosed space.
• Step 3 – Clean filter and grilles: Remove and wash the air filter. Vacuum dust from intake and exhaust grilles to improve airflow.
• Step 4 – Sensor inspection: If HI appears in a normal-temperature room, inspect the ambient and humidity sensors for damage or dislodging. Replace if readings are clearly inaccurate.

When to call a technician: Persistent HI in normal conditions may indicate a control board or sensor calibration issue requiring professional diagnosis.