What can occur if there is a significant dirt build-up in the burner fan?

A significant dirt build-up in the burner fan can lead to a reduced amount of combustion air. The burner fan is responsible for delivering the necessary air to the combustion process, which is crucial for proper fuel combustion. When dirt accumulates, it can obstruct airflow, limiting the amount of air that reaches the burner. This reduction in combustion air adversely affects the combustion process itself, potentially leading to poor burner performance and incomplete combustion.

As a result, not only does this affect efficiency and heat output negatively, but it may also lead to increased emissions, safety hazards, and operational issues within the heating system. Maintaining a clean burner fan is essential for optimal burner operation and overall system efficiency.