F1
AEG
Defrost Sensor / Defrost Cycle Fault
Dehumidifier shows F1 and stops dehumidifying, fan may still run
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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 defrost temperature sensor, Sensor not in contact with evaporator, Wiring damage to defrost sensor, Control board defrost logic failure
How to Fix / Troubleshooting
Safety: Unplug the unit before accessing internal components.
- Locate defrost sensor: On many AEG units, the defrost sensor is another NTC clipped to the lower part of the evaporator coil.
- Check attachment: Ensure the sensor is firmly clipped or taped to the coil. Reattach with aluminum tape if loose.
- Inspect wiring: Follow the sensor wires to the PCB, checking for damage or loose connectors. Reseat the plug.
- Measure resistance: Compare resistance of the defrost sensor to the ambient sensor at the same temperature. Large discrepancies indicate a faulty sensor.
- Replace defrost sensor: Install a new defrost NTC sensor if readings are out of range.
- Board issue: If a new sensor does not clear F1, the main control PCB may have a defrost control fault and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Defrost NTC Sensor
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