De Dietrich Ignition transformer with ignition electrode S100838

The De Dietrich S100838 is a combined ignition transformer with ignition electrode, integrating the high-voltage transformer and the electrode into a single unit. It generates the spark required to ignite the air-fuel mixture during burner start-up. This assembly is resistant to soot, and its ceramic insulator is prone to cracking. It fits a range of De Dietrich boilers and burners, including C 230 ECO, MCR...MI, C 310 / 610 ECO, C 210 ECO, DOMOGAS DGXECO/DGXE AB 05.98, GT 220 - 2200, GTU 1100 V / DIEMATIC ECONOX, DTG 230 ECONOX, DOMOGAS DGXE 14-47 TO 04.95, MC 65/MC 90, WHE 2.24, G 300 S, and M 40-S.

Parts of this type are selected by physical dimensions and mechanical fit, including overall length and bend of the electrode, diameter and material of the insulator, spark gap setting, and type of mounting flange or bracket. The part is typically shaped for a specific burner series, so the original part number or a direct cross-reference is required to ensure correct positioning of the spark in the combustion head. When installing, verify that the spark gap matches the manufacturer's specification and that the ceramic insulator is clean and free of cracks. Any deviation in mounting position or gap can lead to delayed ignition or failure to light.

Common failure modes for these assemblies include erosion of the electrode tip, cracking of the ceramic insulator due to thermal shock, buildup of soot that bridges the gap, and gradual widening of the spark gap that degrades ignition reliability. When such failures occur, the burner may fail to ignite or exhibit delayed ignition. Check the electrode tip for erosion, the insulator for cracks, and the spark gap for proper setting.