If an oil burner fails to start, what is the first thing to check?

When an oil burner fails to start, the initial step in troubleshooting should always be to check for power failure. This is essential because a lack of electrical supply will prevent any component of the burner system, including the ignition system, from functioning.

Without power, the burner cannot operate its controls, fan, and ignition system, which are necessary for the burner to start properly. Ensuring that the power supply is intact, checking circuit breakers, or confirming that the power switch is turned on should be the first actions taken. If power is restored and the burner still fails to start, one can then investigate other potential issues, such as a faulty nozzle, excess fuel problems, or burner sizing.

Understanding this sequence helps in efficiently diagnosing problems, as starting with the most fundamental issue—power—allows for a systematic approach to resolving burner operational failures.