F04
SMEG
Oven Temperature Sensor Range/Drift Error
Oven display shows F04 and heating stops mid-cycle
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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
Sensor reading out of calibration, High resistance in sensor wiring, Failing electronic thermostat, Poor connector contact
How to Fix / Troubleshooting
Safety first: Turn off power and allow the oven to cool.
Steps:
- Inspect sensor wiring: Access the rear of the oven and locate the sensor harness. Check for loose or oxidized connectors.
- Measure resistance: Compare the sensor resistance at room temperature and at a known temperature (e.g., 100°C in boiling water, if removable) to SMEG specifications.
- Replace sensor: If readings are unstable or out of spec, replace the oven temperature sensor.
- Control board: If a new sensor does not resolve F04, the electronic thermostat/control board may be misreading and should be replaced.
Warning: Incorrect temperature control can lead to undercooked food or overheating. Verify operation after repair with an oven thermometer.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor
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