What is the first step to perform if puff-back conditions are present?

When puff-back conditions are present, the primary concern is to ensure safety and prevent further hazards. The first step to take in such situations is to shut down the burner. Puff-backs are caused by a build-up of unburned oil in the combustion chamber, which can ignite and cause an explosion if not addressed immediately. Shutting down the burner stops the combustion process and reduces the risk of a dangerous event occurring.

Prioritizing safety in this way is crucial because ignition systems and oil levels will still pose risks if the burner remains operational while issues are being investigated. Inspecting ventilation is also important to prevent future occurrences, but it should follow the immediate action of shutting down the burner to mitigate any current threats effectively.