The Potterton ignition lead part is based near the electrodes. Usually, there are two different types of electrodes: ignition electrodes and flame sensing electrodes. The ignition electrode is responsible for creating the spark that begins combustion within the burner The flame sensing electrodes are responsible for detecting whether there is a flame present in the burner. This is an important task that ensures the boiler doesn't keep supplying gas while no flame is present.

Brand Name	Potterton