What should be checked if the burner flame flickers frequently?

When a burner flame flickers frequently, checking the condition of the fuel filter is crucial. A fuel filter that is clogged or dirty can limit the flow of oil to the burner, resulting in inconsistent fuel delivery. This inconsistency in fuel supply can lead to an unstable flame, causing it to flicker as the burner struggles to maintain optimal combustion.

Maintaining the fuel filter ensures that the burner operates smoothly and efficiently, providing a steady flame. Regular checks and maintenance of the fuel filter can prevent issues related to incomplete combustion, increased emissions, or mechanical failure, ultimately contributing to the overall reliability of the heating system.