Oven
F03
The F03 error code on an AEG oven indicates a fault with the oven temperature sensor (also called a food probe or NTC sensor), and while it will prevent the oven from operating safely, it’s a relatively common and often fixable issue.
What does this error mean?
F03 means the oven’s control board has detected an open circuit or out-of-range signal from the temperature sensor — the component responsible for telling the oven how hot it actually is. Without a reliable temperature reading, the oven cannot regulate heat safely, so it shuts down and displays F03. This is a protective measure, not a sign of catastrophic failure.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£160 professional repair (sensor or PCB); £150–£250+ if PCB replacement is required
🔍 Likely causes
🛠️ Step-by-step fix
Reset the oven first: switch it off at the wall socket (or trip the circuit breaker), wait 5 minutes, then power back on. If F03 clears, it was a temporary glitch — monitor for recurrence.
Check the food probe socket: if your AEG oven has a probe port on the interior wall, ensure nothing is plugged in. A missing or damaged probe can trigger F03. If a probe is inserted, remove it, clean the socket gently with a dry cloth, and retest.
Inspect the temperature sensor: the NTC sensor is usually a small metal rod mounted on the rear interior wall of the oven cavity. Check that its wiring connector is firmly seated — unplug the oven first, pull the oven away from the wall if needed, and re-seat the connector at the back of the appliance.
Test the sensor resistance: if you own a basic multimeter, the AEG oven NTC sensor should read approximately 990–1000 ohms at room temperature (20°C). A reading of zero, infinity, or wildly outside this range confirms a failed sensor — replace it.
Order a replacement sensor: search your AEG oven’s model number (on the frame inside the oven door) on a reputable UK parts site such as 4ourhouse, eSpares, or Ransom Spares. NTC sensors are typically plug-and-play and cost £15–£35. Fit with the oven unplugged and follow the model-specific guide.
If the error persists after replacing the sensor, stop DIY work — the control board (PCB) is the likely culprit and requires professional diagnosis.
📞 When to call a professional
Call a qualified appliance engineer if the error persists after you’ve replaced the temperature sensor, or if you find burnt, melted, or severely damaged wiring inside the oven cavity. Tell the engineer you have an F03 fault, that you’ve already ruled out a probe/sensor issue, and suspect a PCB fault — this will save diagnostic time. Always use an engineer registered with a recognised body such as the Domestic Appliance Service Association (DASA) or one carrying NICEIC certification.
⚖️ Repair or replace?
A professional repair for an F03 fault typically costs £80–£160 depending on whether it’s the sensor or the PCB. If your AEG oven is under 7 years old, repair is almost always worthwhile — AEG is a premium brand and a replacement oven of equivalent quality costs £500–£1,200+. If the oven is over 10 years old and the PCB has failed, replacement becomes the more economical long-term choice.