Oven
F24
The F24 error code on an AEG oven indicates a fault with the oven’s core temperature sensor (NTC sensor), meaning the appliance cannot accurately read or regulate the internal temperature. It will typically stop heating as a safety precaution, so the oven is unusable until the fault is resolved.
What does this error mean?
AEG uses the F24 code to flag that the oven’s NTC (Negative Temperature Coefficient) temperature sensor has either failed, is reading outside its expected range, or has developed a wiring fault between the sensor and the main control board. The oven’s electronics rely on this sensor to maintain the correct cooking temperature — without a reliable reading, the oven shuts down heating to prevent overheating or undercooking. This is an electrical safety feature, not a mechanical breakdown, but it does require attention before you can use the oven again.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£150 professional sensor repair; £150–£250 if PCB replacement needed
🔍 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 restore power. If F24 clears and does not return, a temporary glitch was the cause — monitor it over the next few uses.
Check the oven cavity for obstructions: remove all shelves, trays, and oven liners, then inspect the back wall for the NTC sensor probe (a small metal pin, usually centrally mounted). Make sure nothing is pressing against or touching it.
Inspect the sensor visually: open the back of the sensor connector if accessible without removing panels — look for obvious burn marks, corrosion, or a broken wire at the plug. Do not probe inside the oven’s rear casing.
Test the NTC sensor resistance (if confident with a multimeter): disconnect the sensor plug and measure resistance across the two terminals. At room temperature (~20°C), a healthy AEG NTC sensor typically reads around 4,000–6,000 ohms. A reading of zero (short) or infinite (open circuit) confirms a failed sensor.
Replace the NTC sensor if faulty: AEG oven NTC sensors are widely available from UK appliance parts suppliers (e.g. eSpares, 4ourhouse, Ransom Spares) for around £15–£35. Ensure you match the part number from your model’s rating plate. Fitting involves removing 1–2 screws and reconnecting the plug — no specialist tools required.
If the sensor tests fine but F24 persists, the fault lies in the wiring harness or the main PCB — stop here and call a professional, as further diagnosis requires removing oven panels and working near live components.
📞 When to call a professional
Call a qualified appliance engineer if the error persists after a reset, if you find burnt wiring inside the oven, or if the sensor tests healthy but the fault continues (pointing to a PCB issue). When booking, tell the engineer: ‘My AEG oven is showing an F24 fault code — I believe it’s an NTC temperature sensor or PCB issue.’ This helps them arrive with the right parts and reduces call-out time.
⚖️ Repair or replace?
A professional repair for an F24 fault typically costs £80–£150 for a sensor replacement, or £150–£250 if the PCB needs replacing. If your AEG oven is under 8 years old and was a mid-to-high-end model (£500+), repair is almost always worth it. If it’s over 10 years old or a budget model, compare the repair quote against the cost of a new oven — a like-for-like replacement starts at around £350–£500 in the UK.