The Potterton 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 causing the spark that starts off combustion within the burner The flame-sensing electrodes are responsible for ensuring there is a flame present in the burner. This is an important task, and if the flame is not detected, the boiler knows to re-attempt ignition.

Brand Name	Potterton