De Dietrich 300009730 ignition electrode+earth

This is an ignition and earth electrode assembly for a De Dietrich burner or boiler. Parts of this type combine two functions in one unit: the ignition electrode delivers the high-voltage spark that lights the fuel, while the earth electrode provides the return path and also serves as the ionisation probe that proves the flame. Both electrodes live in the flame zone and are exposed to high temperature and combustion residues, which makes them consumable items. When selecting a replacement electrode assembly of this kind, the main criteria are the length and bend of the rod, the diameter and material of the insulator, the gap between the electrodes, the type of mounting flange, and the specific burner series for which the geometry was shaped. Typical failure signs include a cracked ceramic insulator, an eroded or sooted tip, or a gap that has drifted open and causes delayed ignition or intermittent lockout. In burners that use a pilot burner, the flame signal is often derived from the pilot flame rather than the main flame; the electrode assembly is then positioned in the pilot flame path. No specific dimensions, gap settings, or compatibility with model numbers can be stated for this article based on the available data. The catalogue article numbers are 300009730 and 336.946.034. When replacing an ignition and earth electrode, always compare the physical shape and fixing arrangement with the original part, and check the gap against the burner manufacturer’s specification before fitting.