F20
Miele
Ambient Temperature Sensor Fault
Microwave shows F20 and will not start; often associated with internal temperature issues.
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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 ambient temperature sensor on control board, Sensor wiring damage, Sensor out of calibration, Control board sensor circuit failure
How to Fix / Troubleshooting
Safety first: Unplug the unit before removing the control panel or covers.
- Room temperature: Ensure the microwave is installed in an environment within the temperature range specified by Miele (not in unheated garages or outdoors).
- Ventilation: Confirm that the unit is not installed in a tightly enclosed space without proper airflow.
- Inspect sensor (advanced): Locate the ambient temperature sensor (often mounted on or near the control board). Check for loose connections or physical damage.
- Replace sensor: If the sensor is separate from the board and tests out of specification, replace it. If integrated into the board, the entire control module may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Ambient Temperature Sensor
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