🔍 Key Concepts

• Boiler safety systems and what conditions they are designed to detect • How flame failure protection works in an automatically fired boiler • The difference between problems that affect combustion detection vs. problems in the fuel system or water level

💭 Think About

• Which condition would make the burner management system "think" there is no safe flame present, and therefore shut off the fuel automatically? • For each option, ask: would this more likely trip a low‑water cutoff, affect ignition quality, confuse the flame sensor, or change fuel circulation — and which of those actually causes automatic fuel shutoff? • Which of the listed problems directly affects the device that senses whether a proper flame is established in the furnace?

✅ Before You Answer

• Identify which choice directly interferes with the flame detection device rather than the water level or fuel return system. • Consider what the burner management system is programmed to do when it senses loss of flame or unreliable flame signal. • Separate issues that would cause poor combustion or maintenance concerns from those that would trigger an immediate safety shutdown of the fuel supply.