What is the most common oven problem?

The most common oven problem across all brands including Whirlpool, GE, LG, and Samsung is oven not heating or not heating to correct temperature, followed by uneven baking and door issues. The not heating problem is usually caused by failed heating element on electric ovens where bake or broil element burns out after 5 to 10 years, visible as break, blister, or no glow when turned on, costing 30 to 60 dollars for part, or failed igniter on gas ovens where igniter glows but not hot enough to open gas valve, costing 40 to 80 dollars. Second most common is inaccurate temperature where oven runs 25 to 50 degrees hot or cold due to failed temperature sensor that should read 1080 ohms at room temperature, or miscalibrated control board. Third is oven not maintaining temperature due to faulty control board relay. Fourth is door not closing properly or door gasket worn, causing heat loss and uneven baking. Fifth is self-clean not working or door stuck locked after self-clean due to door lock motor failure. Sixth is control board failure from power surges causing blank display or error codes like F9E0. Seventh is light not working. To prevent most common oven problems, avoid using foil on bottom that blocks airflow, clean spills promptly, avoid slamming door that damages hinges and gasket, use surge protector, and avoid running self-clean frequently as high heat stresses components.