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The De Dietrich S100838 ignition transformer with ignition electrode, listed under catalogue article 336.946.023, is a combined assembly that integrates both the high-voltage transformer and the ignition electrode into a single unit. Parts of this type generate the spark required to ignite the air-fuel mixture during the burner start-up sequence. The transformer steps up the supply voltage to create a discharge at the electrode tip, while the electrode itself lives in the flame zone and is exposed to combustion conditions. Such units are consumable parts; their service life depends on operating hours and the cleanliness of the combustion environment. Selection of a replacement ignition transformer with electrode is determined by physical dimensions and mechanical fit. Parameters include the overall length and bend of the electrode, the diameter and material of the insulator, the spark gap setting, and the 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. 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 a gradual widening of the spark gap that degrades ignition reliability. In a burner system, the ignition transformer is energised by the burner control during the pre-ignition phase, and the spark must be present before the gas valve or oil solenoid opens. Once flame is confirmed by the ionisation electrode or a UV detector, the control de-energises the transformer to prevent unnecessary wear. The combined electrode-transformer unit is a direct replacement item; 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 the mounting position or gap can lead to delayed ignition or failure to light.