HI
De'Longhi High Humidity Indication / Sensor at Upper Limit

De'Longhi dehumidifier displays HI for humidity and does not seem to reduce moisture effectively.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Extremely high room humidity, Faulty humidity sensor reading maximum, Sensor blocked by dust or film, Poor air circulation around sensor

How to Fix / Troubleshooting

Safety first: Unplug the unit before accessing the sensor area.

Step-by-step:

  • 1. Verify environment: Use a separate hygrometer to check actual humidity. In very wet basements or after flooding, HI may be accurate.
  • 2. Improve ventilation: Close windows and doors to the outside but open interior doors to allow better air circulation. Ensure the unit is not placed in a corner where air is stagnant.
  • 3. Clean around sensor: Locate the humidity sensor near the air intake grille. Gently brush away dust. Do not spray cleaners directly on the sensor.
  • 4. Run continuously: Set the unit to continuous mode (if available) and allow it to run for several hours. If humidity does not drop and HI remains, check for refrigerant or compressor issues (see EC/E9).
  • 5. Replace sensor if readings are clearly wrong: If an external hygrometer shows normal humidity but the unit still reads HI, replace the humidity sensor module.
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Repair Difficulty

Medium 3/5

Required Part

Humidity Sensor / Humidistat Module
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