Oven
F3
The F3 error code on a Zanussi oven signals a fault with the oven temperature sensor (also called the NTC probe). It’s a moderately common fault that can often be resolved without a costly call-out, but it will prevent your oven from heating correctly until fixed.
What does this error mean?
F3 means the oven’s control board is detecting an abnormal reading from the temperature sensor — either an open circuit (sensor disconnected or broken) or a short circuit (sensor shorted out). The oven cannot regulate heat accurately without a working sensor, so it locks out the heating elements as a safety measure. This is an electrical issue, not a gas issue, so it is safe to investigate yourself up to a point.
Est. repair cost
DIY sensor replacement: £15–£35 for the part. Professional repair: £80–£130 (sensor) or £150–£250 (PCB replacement).
🔍 Likely causes
🛠️ Step-by-step fix
Reset the oven first: switch it off at the wall socket (or trip the circuit breaker), wait 5 minutes, then power it back on. If F3 clears and doesn’t return, a temporary glitch caused it — monitor for recurrence.
Check the oven manual: confirm F3 means temperature sensor fault on your specific Zanussi model (check the model number on the oven door frame). Some model ranges use slightly different code definitions.
Inspect the temperature sensor probe: with the oven fully off and cooled, locate the sensor inside the oven cavity — it’s usually a small metal probe on the back wall. Look for visible damage, burn marks, or a broken tip.
Check the sensor connector: carefully pull the oven away from the wall (unplug it first) and locate the wiring connector behind the back panel. Reseat the connector firmly. Do NOT open the main control board housing — stop here if you’re unsure.
Test the sensor resistance: if you own a multimeter, the NTC sensor should read approximately 1,000 ohms at room temperature (20°C). A reading of zero or infinite ohms confirms a faulty sensor — replace it. Compatible sensors cost £15–£35 from UK parts suppliers such as eSpares or 4ourhouse.
Replace the temperature sensor: unscrew the probe from the oven back wall (usually one or two screws), unplug the connector, and fit the new sensor. This is a straightforward part swap requiring no specialist skills — just ensure the replacement is the correct part number for your Zanussi model.
📞 When to call a professional
If replacing the temperature sensor does not clear the F3 code, the fault likely lies with the oven control board (PCB), which requires a qualified appliance engineer to diagnose and replace safely. Call a professional if you are uncomfortable accessing internal wiring or if the oven is hardwired into a fused connection unit rather than a standard 13-amp plug. When calling, tell the engineer: ‘Zanussi oven showing F3 fault — temperature sensor circuit issue, sensor already checked/replaced.’
⚖️ Repair or replace?
A sensor replacement is typically £80–£130 including parts and labour if done professionally — very cost-effective on an oven under 8 years old. If the PCB is the culprit, repair costs rise to £150–£250, at which point the age and original cost of the oven matter; on a budget oven over 8 years old, replacement may make more financial sense. For a mid-range or range cooker, repair is almost always worth it.