H1
Ariston
Humidity Sensor Calibration / Range Error
Humidifier mode shows H1; unit runs but cannot reach set humidity
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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
Drifted humidity sensor, Sensor contaminated by dust or chemicals, Incorrect sensor type fitted, Control board calibration fault
How to Fix / Troubleshooting
Safety: Unplug the unit before accessing the sensor or control board.
Steps to address H1:
- 1. Verify environment: Use an external hygrometer to compare room humidity with the unit’s display. Large discrepancies suggest sensor issues.
- 2. Clean the humidity sensor: Access the sensor behind the intake grille. Gently blow away dust with compressed air. Avoid liquids.
- 3. Check sensor part number: If the sensor was previously replaced, confirm it matches the original Ariston specification.
- 4. Replace sensor if readings are inaccurate: Install a new humidity sensor module and retest.
- 5. If H1 persists with a new sensor: The control board calibration or ADC circuit may be faulty, requiring main control board replacement.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor Module
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