During the startup of a spark ignition furnace, if the spark continues to ignite but the burners go out after 60 seconds, what is the likely suspect?

When a spark ignition furnace successfully ignites the burners initially but then experiences a shutdown after around 60 seconds, it typically indicates a problem with the ignition system not sustaining combustion. The ignition board, which controls the ignition sequence and monitors the status of the flame, is essential for ensuring that the burners stay lit once ignited. If this component is malfunctioning, it may not properly monitor the flame's presence or fail to maintain the spark once the burners are lit, leading to their subsequent shutdown.

The ignition board's failure can result from poor connections, faulty circuitry, or issues with the sensors that detect whether the flame is present. Thus, if the burners go out after igniting successfully, checking the ignition board for faults is a critical step in troubleshooting.

Understanding this behavior helps pinpoint specific system components that could be the source of the problem, allowing for a more effective repair strategy.