Oven overheats and burns food even when set to a low temperature; no error code displayed.

Safety first: Disconnect power before accessing control components.

• Confirm with thermometer: Use an oven thermometer to verify that the actual temperature is significantly higher than the set temperature.
• Test sensor or thermostat: For electronic models, measure NTC sensor resistance at room temperature and compare to spec. For mechanical models, test thermostat contacts for proper opening/closing as temperature changes.
• Inspect control board: Look for signs of a welded heating relay (burn marks, relay stuck closed).
• Replace faulty part: Replace the oven temperature sensor or oven thermostat if they are out of spec. If the relay is stuck, replace the main control board.