Oven
F4
The F4 error code on a Candy oven indicates a fault with the oven temperature sensor (NTC probe), meaning the appliance cannot accurately read or regulate its internal temperature. This fault will prevent the oven from heating safely and must be addressed before use.
What does this error mean?
The F4 code tells you the oven’s electronic control board has detected an abnormal reading — or no reading at all — from the NTC (Negative Temperature Coefficient) temperature sensor inside the oven cavity. This sensor feeds live temperature data to the control board so it can manage heating elements accurately. Without a reliable signal, the oven shuts down as a safety measure to prevent overheating or underheating.
Est. repair cost
£10–£25 DIY (NTC sensor part only); £80–£150 professional repair including labour
🔍 Likely causes
🛠️ Step-by-step fix
Step 1 — Reset the oven: Switch the oven off at the wall socket, wait 5 minutes, then switch back on and test. A power-cycle clears temporary software faults and costs you nothing.
Step 2 — Check your fuse box: Confirm the circuit breaker for your cooker hasn’t partially tripped. Reset it fully if needed, then retest the oven.
Step 3 — Inspect the oven cavity visually: Open the oven door and look for the NTC sensor — it’s a small metal probe, usually mounted on the back wall or side of the oven cavity. Check for obvious physical damage, burn marks, or a probe that has come loose from its bracket.
Step 4 — Check the sensor wiring (if comfortable doing so): With the oven completely unplugged from the mains, gently pull the oven away from the wall and remove the back panel if accessible. Inspect the wiring leading from the NTC sensor for any visible breaks, melting, or disconnected spade connectors. Reconnect any loose connectors firmly.
Step 5 — Replace the NTC temperature sensor: If the probe looks damaged or your multimeter reads an open circuit (infinite resistance) across its terminals, the sensor needs replacing. Candy NTC sensors are widely available online for £10–£25. Match the part number from your oven’s model label (usually inside the door frame). Unplug the oven, disconnect the old sensor, and fit the new one — no specialist tools required.
Step 6 — If the F4 code persists after a new sensor: The control board (PCB) is likely faulty. This requires a professional repair — do not attempt to replace the PCB yourself unless you are a qualified electrician.
📞 When to call a professional
Call a qualified appliance repair engineer if the F4 error returns after you have replaced the NTC sensor, or if you find burnt or melted wiring inside the appliance. Tell the engineer: ‘My Candy oven is displaying an F4 error code — I believe it’s an NTC temperature sensor fault.’ This will save diagnostic time and may reduce your call-out cost.
⚖️ Repair or replace?
A professional repair for an F4 fault typically costs £80–£150 in the UK, covering parts and labour. If your Candy oven is under 7 years old and otherwise in good condition, repair is almost always the better value. For ovens over 8–10 years old, consider that a new mid-range electric oven costs £300–£600 — if the PCB is also failing, replacement may be more economical in the long run.