Gas Heat ESCO Practice Exam

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When a spark ignition furnace’s main burners light but the spark igniter continues to spark and the burner goes out after 60 seconds when the blower fan comes on, what is the likely issue?

Faulty flame sensor
Faulty ignition board
Faulty gas valve
Faulty thermostat

The correct answer is: Faulty ignition board

This is because if the main burners are lighting but the spark igniter continues to spark and the burner goes out, it indicates that the spark igniter is not properly detecting the flame and the system is shutting off as a safety precaution. This could be due to a faulty ignition board, which controls the spark igniter and monitors the flame sensor. A faulty flame sensor or gas valve could also cause this issue, but they would manifest in other symptoms as well. A faulty thermostat is unlikely to be the root cause of this specific issue.