Oven
F3
The F3 error code on a Miele oven indicates a fault with the oven temperature sensor (NTC sensor), preventing the appliance from accurately monitoring heat — it will typically refuse to operate until the fault is resolved.
What does this error mean?
F3 tells you the oven’s internal temperature sensor (known as an NTC or thermistor) is sending a reading outside the expected range — either no signal, a short circuit, or an open circuit. The oven’s control board cannot confirm the cavity is at a safe temperature, so it locks out as a precaution. This is an electrical fault, not a gas issue, so safe DIY investigation is possible up to a point.
Est. repair cost
£15–£50 DIY sensor replacement; £80–£200 professional repair (including call-out); £250+ if PCB replacement is required
🔍 Likely causes
🛠️ Step-by-step fix
Power cycle the oven: switch it off at the wall socket or isolate at the fuse board, wait 5 minutes, then restore power. A transient fault can trigger F3 and a reset clears it.
Check the error code in your Miele manual or the Miele website to confirm F3 maps to a temperature sensor fault on your specific model series, as codes can vary slightly.
Locate the NTC sensor — on most Miele ovens it is a small metal probe mounted on the rear interior wall of the oven cavity. Inspect it visually for obvious damage, burning, or heavy grease build-up.
Clean the sensor probe gently with a damp cloth and a little washing-up liquid if it is heavily soiled. Dry thoroughly, then retest the oven.
With the oven fully isolated from the mains, carefully check the sensor’s wiring connector (usually accessible from the back of the oven). Reseat any loose connector firmly. Do NOT open the control board housing — stop here and call a professional.
If the error persists after the above steps, the NTC sensor itself likely needs replacing. Miele NTC sensors for common models cost £15–£50 and are available from Miele directly or UK appliance parts suppliers (e.g. 4ourhouse, Espares). Match the part number exactly to your model.
📞 When to call a professional
Call a qualified appliance engineer if the error returns after a reset and cleaning, or if the wiring or sensor replacement does not resolve the fault — the control board (PCB) may need professional diagnosis. When calling, tell the engineer: ‘My Miele oven is displaying error code F3, which I understand relates to the NTC temperature sensor.’ This saves diagnostic time and may reduce your call-out cost.
⚖️ Repair or replace?
A professional repair — covering call-out, diagnosis, and NTC sensor or PCB replacement — typically costs £80–£200 in the UK depending on the fault and your location. Miele ovens are built to last 20+ years; if yours is under 12–15 years old and in otherwise good condition, repair is almost always the better value. If the PCB is at fault on an older oven and the repair quote exceeds £250, replacement becomes worth considering.