What is a major cause of electrical heat element burnout?

A major cause of electrical heat element burnout is low airflow. Electric heating elements rely on adequate airflow to effectively transfer heat to the surrounding air. When there is insufficient airflow, the heat generated by the element cannot dissipate quickly enough, leading to overheating. This excessive heat can cause the element to fail or burn out, as it exceeds the material's temperature tolerance.

In HVAC systems, maintaining proper airflow is crucial not only for the efficiency and effectiveness of heating but also to extend the lifespan of the electric heat elements. Keeping air filters clean and ensuring that ductwork is unobstructed helps prevent low airflow conditions, which can ultimately safeguard the heating elements from burnout.

Other options may present their own issues, but low airflow is the most direct cause of electrical heating element failure through overheating.