F4
Miele
Oven Temperature Sensor Open Circuit
F4 error; oven or cooktop heating disabled; may be intermittent depending on temperature.
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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
Broken NTC sensor element, Disconnected sensor plug at control, Broken wire in sensor harness, Corroded connector pins at control board
How to Fix / Troubleshooting
Safety: Disconnect power before removing panels or handling wiring.
- Check connections: Access the control board and verify the sensor connector is fully seated. Gently tug each wire to ensure it is crimped securely.
- Continuity test: Disconnect the sensor and measure resistance. An infinite reading (OL) indicates an open sensor.
- Harness inspection: Flex the harness while measuring continuity to detect intermittent breaks.
- Replace components: Replace the oven temperature sensor if open. If the harness is open, replace or repair with high‑temp wiring and proper connectors.
- Reset: Restore power and test a low‑temperature bake cycle to confirm normal operation.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor (NTC)
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