Baxi Ignition transformer 07000451/04

The Baxi Ignition transformer 07000451/04 is a component used to step up mains voltage to the level required for producing a spark at the ignition electrode gap. It operates only during the ignition phase of the burner sequence, under command from the burner control. This transformer is compatible with a range of Baxi boilers, including ECO 1.240 Fi, 1.240 i, 240 Fi, 240 i, 280 Fi, 280 i, ECO-3 1.240 Fi, 240 Fi, 240 i, 280 Fi, ENERGY TOP 24, LUNA 1.240 Fi, and 1.310. The ignition cable insulation is silicone, which withstands high voltage and heat.

When selecting a replacement ignition transformer of this type, verify that the primary voltage (commonly 230 V, but 110 V and 24 V variants exist), secondary voltage and current, duty cycle, mounting arrangement, terminal type, and connector pattern for the high-voltage cable match the original. The physical interface varies between makes, so ensure the replacement matches the original mounting and terminal layout. Also check the condition of the ignition cable; it should be silicone-insulated and free from hardening or cracks.

Ignition transformers of this kind typically fail electrically (open primary or secondary winding, short circuit) or mechanically (cracked housing or broken terminals). When a transformer fails, the burner may not ignite or may have intermittent ignition. A hardened or cracked ignition cable can leak the spark to earth, which may appear as a faulty transformer. Check the transformer and cable for visible damage and test continuity.