Oven will not heat, display shows F01 shortly after a heating cycle is started

Safety first: Switch off the cooker at the wall isolator and turn off power at the consumer unit (breaker) before removing any panels. Allow the oven to cool completely.

• Check for obvious damage: Open the main oven door and locate the temperature sensor probe at the rear of the cavity (usually a thin metal rod held by 1–2 screws). Inspect for physical damage or heavy grease/carbon build-up.
• Clean and reseat: If the probe is heavily soiled, gently clean it with a non-abrasive cleaner and a soft cloth. From the rear of the cooker (after removing the back panel), locate the sensor connector and unplug/replug it several times to clear oxidation.
• Test the sensor: With a multimeter set to resistance (ohms), measure across the sensor terminals. A typical Leisure NTC sensor should read roughly 500–1100 Ω at room temperature (exact value varies by model). If it reads open (OL) or near 0 Ω, the sensor is faulty and must be replaced.
• Inspect wiring: Follow the sensor harness from the cavity to the main control board. Look for burnt, pinched, or broken wires and repair or replace as needed.
• Replace parts as needed: If wiring and sensor test good, the fault is likely on the electronic control board (PCB). Replacement of the PCB is more complex and is best done by a qualified technician.

Do not operate the oven with a bypassed or shorted sensor; this is a fire and burn hazard.