F3
De'Longhi
Humidity Calibration / Sensor Range Error
De'Longhi dehumidifier displays F3 and cycles off prematurely.
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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
Humidity sensor drifted out of calibration, Sensor exposed to chemicals or smoke, Faulty sensor electronics, Control board misreading sensor
How to Fix / Troubleshooting
Safety first: Unplug the unit before accessing the sensor.
Step-by-step:
- 1. Compare readings: Place a reliable hygrometer near the dehumidifier intake and compare humidity readings. If the unit's reading is far off, the sensor is suspect.
- 2. Clean sensor area: Gently brush dust away from the humidity sensor. Avoid solvents or sprays.
- 3. Reset power: Unplug for 5 minutes, then restart and check if F3 returns.
- 4. Replace humidity sensor: If F3 persists and readings are inaccurate, replace the humidity sensor module with a De'Longhi-compatible part.
- 5. PCB replacement (rare): If a new sensor does not resolve F3, the main PCB may be misreading the sensor and will need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor / Humidistat Module
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