If the burner lights but the igniter continues to spark, what part is likely faulty?

When the burner lights successfully but the igniter continues to spark, this behavior typically indicates an issue with the ignition module. The ignition module controls the spark generated by the igniter and is responsible for determining when to activate it. If the burner ignites but the igniter does not turn off after the flame is established, it suggests that the ignition module is not receiving or signaling a confirmation that the burner has ignited. As a result, the igniter continues to spark unnecessarily.

In this scenario, while the igniter and burner assembly are functioning properly (the igniter produced a spark that ignited the gas), the ignition module is not performing as expected. Therefore, diagnosing a fault in the ignition module is crucial, as it plays a central role in managing the ignition sequence and ensuring it ceases once a flame is detected.