Oven
F32
The F32 error code on a Siemens oven indicates a fault with the temperature sensor (NTC sensor) circuit — it’s one of the more common oven faults and, in many cases, is fixable without a costly engineer call-out.
What does this error mean?
F32 signals that the oven’s control board has detected an open circuit or abnormal resistance reading from the temperature sensor, also called an NTC (Negative Temperature Coefficient) sensor. This sensor monitors the oven cavity temperature and feeds data back to the control board. When the signal is absent or out of range, the oven shuts down as a safety precaution to prevent overheating or unsafe operation.
Est. repair cost
£15–£40 DIY (NTC sensor part only); £80–£160 for a professional repair including call-out; £200–£300 if the control board (PCB) requires replacement
🔍 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. If F32 clears and doesn’t return, it was a temporary electronic glitch.
Check the oven’s user manual reset procedure: Some Siemens models allow a soft reset by holding the clock or function button for 5–10 seconds. Consult your model’s manual for the exact sequence.
Inspect the sensor connector (if comfortable doing so with the oven fully unplugged): Remove the oven from its housing following your model’s instructions, locate the NTC sensor at the rear of the oven cavity, and check that the connector is firmly seated and shows no obvious burn marks or corrosion. Reseat the connector and restore power to test.
Test or replace the NTC temperature sensor: With the oven unplugged, disconnect the sensor and use a multimeter to check resistance — a healthy NTC sensor typically reads around 1,000–2,000 ohms at room temperature. A reading of zero or infinity confirms a failed sensor. Replacement Siemens-compatible NTC sensors cost £15–£40 online; fitting is a straightforward two-screw job on most models.
Inspect the wiring loom for visible damage: With the oven unplugged, trace the sensor cable back towards the control board. Look for melted insulation, chafing, or broken wires. Minor breaks can be repaired with high-temperature appliance wire; extensive damage means the loom needs replacing — consider calling an engineer at this point.
If all wiring and the sensor test correctly, the control board (PCB) is likely faulty: Do not attempt to repair the PCB yourself. This requires a professional diagnosis and replacement.
📞 When to call a professional
Call an appliance engineer if the fault persists after a reset, if you find burnt or extensively damaged wiring, or if a new NTC sensor does not clear the code — this points to a PCB fault requiring specialist diagnosis. When you call, tell the engineer you have a Siemens oven displaying error code F32, that you’ve already checked/replaced the NTC sensor, and describe any wiring damage you observed. This will save time and reduce your call-out cost.
⚖️ Repair or replace?
A professional repair for an F32 fault typically costs £80–£160 depending on the engineer’s call-out rate and whether only the sensor or also the PCB needs replacing. If your Siemens oven is under 8 years old and has otherwise been reliable, repair is almost always the better value — a comparable built-in oven costs £400–£900 to replace new. If the oven is over 10 years old and the PCB has failed, replacement is worth serious consideration given that PCB repairs alone can approach £200–£300.