Which part must be checked for leaks during oil burner maintenance?

During oil burner maintenance, checking the oil lines and fittings for leaks is crucial because these components are responsible for transporting oil from the storage tank to the burner. Any leaks in the oil lines can lead to not only fuel loss but also safety hazards, such as the risk of fire or environmental contamination.

The integrity of the oil lines and fittings ensures that the oil flows properly and that the system operates efficiently. Identifying and fixing leaks can prevent operational issues and costly repairs, ensuring that the oil burner functions correctly throughout its lifespan.

The other parts mentioned, such as the combustion chamber and thermostat, the oil storage tank and regulator, and the chimney and flue pipe, while also important for overall system performance, are not primarily focused on the oil delivery system where leaks are most critical.