Oven
F22
The F22 error code on a Bosch oven indicates a problem with the oven temperature sensor (NTC sensor), meaning the oven cannot accurately monitor or regulate its internal temperature. This fault will prevent the oven from heating safely and needs to be addressed promptly.
What does this error mean?
The F22 code tells you that the oven’s control board is receiving an abnormal signal from the NTC (Negative Temperature Coefficient) temperature sensor — or no signal at all. This sensor sits inside the oven cavity and continuously feeds temperature data to the control board. Without a reliable reading, the oven’s safety system shuts the appliance down to prevent overheating or undercooking.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£150 professional sensor repair; £200–£280 if PCB replacement is needed
🔍 Likely causes
🛠️ Step-by-step fix
Power off and reset: Switch the oven off at the wall socket or isolate it at the fuse box. Wait 5 minutes, then restore power. If F22 clears and does not return, it was a temporary control board glitch — monitor closely for recurrence.
Check the sensor visually: With the oven cold and unplugged, locate the NTC sensor — it is typically a small metal probe mounted on the back wall of the oven cavity, secured by one or two screws. Look for obvious damage: burn marks, corrosion, or a visibly broken probe.
Inspect the sensor connector: Trace the sensor cable to where it connects at the back of the oven (accessible by removing the back panel — only do this if you are confident isolating the appliance safely). Check the connector is firmly seated and free from corrosion or melted plastic.
Test the sensor with a multimeter: A working Bosch NTC oven sensor should read approximately 990–1,010 ohms at room temperature (around 20°C). If your reading is significantly outside this range — or shows open circuit (OL) — the sensor has failed and needs replacing.
Replace the NTC sensor: Bosch oven NTC sensors are widely available from UK appliance parts suppliers (e.g. 4ourhouse, Currys Parts, or Buyspares) for £15–£35. Unscrew the old sensor, unplug the connector, fit the new one, and reconnect. Clear the fault by powering back on.
If F22 persists after sensor replacement: The control board (PCB) is likely the cause. Stop here — PCB diagnosis and replacement requires a qualified appliance engineer.
📞 When to call a professional
Call a qualified appliance engineer if the error persists after you have replaced the NTC sensor, or if you are not comfortable working around the internal wiring of the oven. When calling, tell the engineer: ‘My Bosch oven is showing fault code F22 — I believe it’s an NTC sensor or PCB issue.’ This saves diagnostic time and may reduce your call-out cost.
⚖️ Repair or replace?
A professional repair for F22 typically costs £80–£150 in the UK, covering call-out, diagnosis, and a sensor replacement — or up to £200–£280 if the control board needs replacing. If your Bosch oven is over 10 years old and the PCB has failed, replacement is likely more cost-effective, as new mid-range Bosch ovens start from around £350–£500. For ovens under 8 years old in otherwise good condition, repair is almost always worth it.