F12
De Dietrich
Oven Temperature Sensor (Probe) Fault
Oven display shows F12 and heating does 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
Open-circuit temperature probe, Shorted probe, Loose probe connector at control board, Damaged probe wiring from heat
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before accessing the rear of the oven.
- Locate probe: Inside the oven cavity, find the temperature sensor (usually a thin metal rod at the rear or top). Remove its mounting screws.
- Check wiring: Gently pull the sensor forward to access the connector. Inspect for heat damage or loose connections.
- Measure resistance: With a multimeter, measure the sensor resistance at room temperature. Compare with De Dietrich specifications (commonly around 1 kΩ–1.1 kΩ at 20°C for some probes). An open or very low reading indicates a faulty sensor.
Repair: Replace the oven temperature sensor if readings are out of range. If the sensor is good, the control board input may be defective.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor
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