Oven
F14
The F14 error code on a Siemens oven signals a fault with the oven’s temperature sensor (NTC sensor) or its associated wiring — it’s a moderately serious fault that will prevent the oven from heating safely until resolved.
What does this error mean?
F14 tells you that the oven’s control board has detected an abnormal reading from the NTC (Negative Temperature Coefficient) temperature sensor, which monitors the internal cavity temperature. Either the sensor is reading a temperature that’s out of the expected range, or the signal from the sensor to the control board has been interrupted entirely. The oven locks out heating functions as a safety precaution to prevent overheating or uncontrolled temperatures.
Est. repair cost
£15–£40 DIY NTC sensor replacement; £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 trip the circuit breaker, wait 5 minutes, then restore power. A temporary software glitch can trigger F14 and a hard reset clears it.
Check the oven cavity for debris or heavy spillage around the temperature sensor probe (usually a small metal pin located at the back or side wall of the oven). Carefully clean any burnt-on residue with a damp cloth once the oven is completely cool.
Visually inspect the sensor probe for obvious physical damage — cracks, melting, or discolouration. A damaged probe needs replacing and is not repairable.
Check your oven’s fan (if fan-assisted) is spinning freely and not obstructed by debris. A blocked fan causes heat build-up that can trigger temperature faults. Clean any visible blockage with the oven cold and unplugged.
If the error persists after a reset and basic cleaning, the NTC sensor itself is likely failed. Replacement NTC sensors for Siemens ovens are available from UK appliance parts suppliers (e.g. eSpares, 4ourhouse) for £15–£40. Replacing the sensor involves removing the back panel of the oven cavity — only attempt this if you are comfortable working with unplugged electrical appliances.
If replacing the sensor does not clear the fault, the control board may be at fault — stop DIY at this point and call a qualified appliance engineer, as control board diagnosis and replacement requires specialist tools.
📞 When to call a professional
Call a qualified appliance repair engineer if the error returns immediately after a power reset, if you find burnt or melted wiring inside the oven cavity, or if replacing the NTC sensor yourself does not resolve the fault. When booking, tell the engineer: ‘My Siemens oven is showing an F14 error — I believe it’s a temperature sensor or control board fault.’ This helps them arrive with the right parts.
⚖️ Repair or replace?
A professional repair for an F14 fault — covering diagnosis, NTC sensor or control board replacement — typically costs £80–£180 in the UK including labour. If your Siemens 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 and the control board needs replacing (parts alone can exceed £150), replacing the oven is likely the more cost-effective decision.