F3
Haier
Humidity Sensor Error (Alternate Code)
Dehumidifier displays F3 and will not regulate humidity correctly; may not start.
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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
Defective humidity sensor, Sensor contaminated with dust or moisture, Loose sensor harness, Faulty humidity input on PCB
How to Fix / Troubleshooting
Safety first: Unplug the unit before removing the front grille.
- Locate humidity sensor: Find the small vented sensor housing near the air intake or on a bracket inside the airflow path.
- Clean sensor area: Use compressed air or a soft brush to remove dust. Do not spray cleaners directly on the sensor.
- Check wiring: Ensure the sensor harness is firmly connected at both the sensor and PCB ends.
- Replace sensor: If F3 persists, replace the humidity sensor assembly with the correct Haier part.
- PCB replacement: If a new sensor does not resolve F3, the main control board may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor Assembly
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