🔍 Key Concepts

• Boiler safety sequence when a flame failure or flame-out occurs • How water in fuel affects burner operation and what must be done before attempting to relight • The difference between immediate safety actions and follow‑on corrective actions

💭 Think About

• Ask yourself: in a sudden loss of fires, what automatic or manual actions are needed right away to protect the boiler and furnace? • Which option deals with making the system SAFE before you think about cleaning, adjusting, or reducing load? • Which actions can safely wait until after you’ve isolated the fuel source that caused the problem?

✅ Before You Answer

• Identify which choice directly stops fuel flow to the burners in a flame‑out situation. • Check which actions are normally part of a post‑shutdown or pre‑purge sequence, not the very first reaction. • Verify that your first action would prevent any chance of unburned fuel accumulation in the furnace.