When your burner shuts down on a flame failure, your first instinct is to hit reset—but that could introduce unburned gas into the combustion chamber. Here's what to do instead. Jude walks through a real lockout 9 fault on a flame safeguard, explains what 'flame detected in standby' actually means, and shows a step-by-step troubleshooting process—including how to use the Honeywell four-line display and how to identify a failed flame scanner before it causes a dangerous situation. Blindly resetting a flame safeguard lockout without troubleshooting can mask a failed scanner, a leaking gas valve, or carbon buildup, any of which can lead to unburned gas in the combustion chamber and serious damage. Safety notice: Always consult experts for complex repairs. Weekly Boiler Tips are compiled by the knowledgeable and remarkably prolific content creators at WARE, a family owned, third-generation, 69-year-old commercial and industrial boiler rental and service firm based in Louisville KY. You can learn all about this and more at WARE's Boiler University.