De Dietrich 84064820 ignition transformer

The De Dietrich 84064820 is an ignition transformer. Parts of this type step up mains voltage to a level that generates a spark at the ignition electrode gap. The transformer is energised only during the ignition period, under command from the burner control. It is not active during normal flame operation. When selecting a replacement ignition transformer, the primary voltage must match the supply (230 V is common, but 110 V and 24 V models exist), and the secondary voltage and current must be suitable for the electrode and combustion head design. Duty cycle, mounting arrangement, and terminal or cable connector pattern also matter. The ignition cables that connect the transformer to the electrode are silicone‑insulated to withstand high voltage and heat. A cracked or hardened cable can leak the spark to earth, causing a fault that may be mistaken for a failed transformer. Always inspect the cable and the electrode ceramic insulator before condemning the transformer itself. No specific compatibility, ratings, or dimensions are recorded for this particular article beyond its catalogue and manufacturer codes.