Oven overheats rapidly, temperature far exceeds the set value, food burns even at low settings.

Safety first: Turn off power at the breaker immediately if the oven is overheating. Allow it to cool fully before inspection.

• Check cavity temperature sensor: Locate the Toshiba NTC sensor probe inside the cavity (usually at the rear or upper side). From the rear panel, disconnect its connector and measure resistance at room temperature. Compare to Toshiba service specs (commonly ~1–1.1 kΩ at 25°C or as specified). If reading is far off or unstable when gently warmed, replace the sensor.
• Inspect sensor wiring: Follow the harness from the sensor to the control PCB. Look for pinched, melted, or shorted wires touching the metal chassis. Repair or replace damaged sections and secure with high‑temp clips.
• Check heater relay on PCB: With power disconnected, inspect the main heater relay on the Toshiba control board. If contacts are welded closed (signs of burning, melted plastic), the relay may be stuck on. Replace the control board or have the relay professionally replaced.
• Recalibrate / reset: Some Toshiba ovens allow temperature calibration via the user menu. After replacing the sensor, perform a factory reset or calibration according to the user manual.

If overheating persists after sensor replacement, discontinue use and call a technician, as uncontrolled heating is a fire risk.