Vaillant Ignition Transformer 0020143448

The Vaillant 0020143448 is an ignition transformer used on ecoTEC VU open-vent boiler models. It generates the high-voltage supply that arcs across the ignition electrode to light the gas at the burner. It sits within the boiler's ignition unit circuit and is listed by Vaillant under ignition components.

• The boiler attempts to fire but there is no spark at the ignition electrode.
• Repeated ignition lockouts with the fan and gas valve operating normally.
• Audible clicking from the ignition circuit but no burner light-up.
• Visible burning, cracking, swelling or a burnt smell around the transformer body.
• Intermittent ignition that becomes progressively less reliable.

• Confirm your boiler model and GC number against the fit list above.
• Check the part number printed on the existing transformer matches 0020143448.
• Inspect the ignition electrode, leads and connections before condemning the transformer, as a poor electrode or damaged lead can mimic transformer failure.
• Isolate the electrical supply and follow the manufacturer's instructions for safe removal and refitting.