Cooker
F05
The F05 error code on a Leisure cooker indicates a fault with the oven’s temperature sensor (NTC probe), meaning the appliance cannot accurately read or regulate the oven cavity temperature. It’s a moderately serious fault — the oven will typically stop heating or refuse to start until resolved.
What does this error mean?
F05 signals that the oven’s NTC temperature sensor has returned a reading outside the expected range — either an open circuit (sensor disconnected or broken) or a short circuit (sensor shorted out). The cooker’s control board uses this sensor to regulate heat; without a reliable reading, it shuts the oven down as a safety precaution. This is an electrical fault on the oven cavity itself, not the hob, and it is safe to investigate at a basic DIY level.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£160 for a professional repair including parts and labour
🔍 Likely causes
🛠️ Step-by-step fix
Step 1 — Reset the cooker: Switch the appliance off at the wall socket (or trip the circuit breaker), wait 5 minutes, then restore power. Attempt to start the oven. If F05 clears, monitor for recurrence.
Step 2 — Check for a recent disturbance: If you have recently deep-cleaned the oven or carried out any repair, check whether the NTC sensor probe (a small metal rod, usually at the back or top-rear of the oven cavity) is still firmly seated in its bracket and not touching a heating element.
Step 3 — Inspect visible wiring: With the cooker fully unplugged from the mains, open the oven door and look for any visible wiring near the sensor that appears scorched, melted, or pulled loose. Do not open any control panels or back covers — if the fault is inside the electronics housing, stop here.
Step 4 — Test or replace the NTC sensor: The NTC sensor for most Leisure ovens (including CLA and RangeXtra models) is an inexpensive part (£15–£35) available from UK appliance parts suppliers such as eSpares or 4ourhouse. The sensor typically unscrews from inside the cavity and unplugs from a wiring connector — no specialist tools required. Search your model number to confirm compatibility before ordering.
Step 5 — Recheck after replacement: Refit the new sensor, restore power, and run the oven through a short heat cycle to confirm the F05 error has cleared and the oven reaches temperature correctly.
Step 6 — If the error persists after sensor replacement: The fault is likely in the wiring harness or control board. Do not attempt to repair or replace the control board yourself — book a qualified appliance engineer at this point.
📞 When to call a professional
Call a qualified appliance repair engineer if the F05 error returns after a reset and a new NTC sensor has been fitted, as the fault likely lies in the wiring harness or main control board. Also call a professional if you are not comfortable working inside the oven cavity, or if the cooker is a dual-fuel model (electric oven, gas hob) — tell the engineer you have an F05 fault code, confirmed or suspected NTC sensor issue, and the full model number of your Leisure cooker.
⚖️ Repair or replace?
A professional repair for an F05 fault typically costs £80–£160 including parts and labour, depending on whether it’s just the sensor or the control board. If your Leisure cooker is under 7 years old, repair is almost always the right call. If it’s over 10 years old and the control board needs replacing (parts alone can reach £80–£120), weigh repair costs against a new range cooker, where budget models start from around £400–£500.