Usually, there are two different types electrode, Ignition electrodes and flame sensing electrodes ,The Ignition / Spark Electrode causes 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 .
Lead Attached
Technical specification
Waist Sizead65ce14gxTypeElectrodeToilet Cistern CapacityFTW--Supplier Part Number402S571Manufacturer Model No4525624Brand NameVaillant