Oven overheats, burning food; temperature far higher than set; may trip safety thermostat.

Safety: If the oven is overheating, switch it off immediately at the wall and allow it to cool fully. Do not continue using it until the fault is resolved.

• Check temperature sensor: Locate the sensor probe inside the oven cavity. From the rear, disconnect its connector and measure resistance at room temperature. Compare with Belling specifications (commonly around 1 kΩ–1.1 kΩ at 20°C). A very low resistance or short indicates a faulty sensor that must be replaced.
• Inspect mechanical thermostat (if fitted): On some Belling models, a capillary thermostat controls temperature. Check for signs of damage to the capillary tube and test continuity across the thermostat terminals. If it remains closed regardless of knob position, replace it.
• Check safety thermostat: Many ovens have a non-resettable or manual-reset overheat thermostat on the top of the oven cavity. If it has tripped, the oven may stop heating; if it fails to open, overheating can occur. Replace if faulty.
• PCB relay check: If the sensor and thermostats are good, the heating relay on the control PCB may be welded closed, constantly powering the element. Visual inspection may show burnt contacts. PCB replacement is recommended and should be done by a qualified engineer.

Do not bypass any thermostats or safety devices; they are critical for fire prevention.