Oven
F05
The F05 error code on an AEG oven indicates a fault with the oven’s temperature sensor (NTC probe) or its wiring circuit. It’s a moderately serious fault — your oven will likely stop heating until it’s resolved.
What does this error mean?
The F05 code tells you the oven’s control board has detected an abnormal reading from the NTC temperature sensor — the small probe inside the oven cavity that monitors heat levels. This could mean the sensor is reading a temperature that’s impossibly high, impossibly low, or no signal is being received at all. Without a reliable temperature reading, the oven’s safety systems shut down heating to prevent overheating or damage.
Est. repair cost
£15–£40 DIY (NTC sensor part only); £80–£180 for a professional repair including labour
🔍 Likely causes
🛠️ Step-by-step fix
Power cycle the oven: switch it off at the wall socket or fuse spur, wait 5 minutes, then switch it back on. This clears temporary software glitches and costs nothing.
Check your trip switch: go to your consumer unit (fuse box) and confirm the circuit breaker for your oven hasn’t partially tripped. Reset it if needed.
Inspect the NTC sensor: pull the oven away from the wall, remove the back panel screws (no tools beyond a Pozidriv screwdriver needed), and visually check the sensor probe — usually a small metal cylinder mounted inside the oven cavity wall — for obvious burn marks or physical damage.
Check the sensor connector: trace the wiring from the NTC sensor to its plug connector. Unplug and re-seat the connector firmly. Look for any corrosion on the terminals — a gentle clean with electrical contact cleaner can help.
Test the NTC sensor with a multimeter: a healthy AEG NTC sensor typically reads around 1,000 ohms (1kΩ) at room temperature. A reading of 0 or infinity (OL) confirms a failed sensor — replace it. Genuine or compatible AEG NTC sensors are available online for £15–£40.
If the sensor tests fine and the error persists after reconnecting everything, the control board is the likely culprit — stop here and call a professional, as board replacement requires handling live electrical components.
📞 When to call a professional
Call a qualified appliance repair engineer if the error returns after a power cycle, or if your multimeter confirms the NTC sensor is within spec but the fault persists — this points to a control board failure. Tell the engineer: ‘My AEG oven is displaying an F05 error code, I’ve checked the NTC sensor and it tests at [X] ohms.’ Expect a diagnostic visit charge of £60–£90 in most UK regions.
⚖️ Repair or replace?
An NTC sensor replacement is a cost-effective DIY fix at £15–£40 for the part. A professional repair — whether for sensor replacement or control board work — typically costs £80–£180 including labour. If your AEG oven is over 10 years old and requires a new control board (parts alone can reach £100–£200), replacement with a new oven is likely the better financial decision. Ovens under 7 years old are almost always worth repairing.