Vaillant Pilot Burner Nozzle 042825

The Vaillant 042825 is a pilot burner injector nozzle with a 0.25 mm orifice diameter. It meters the gas supply to the pilot burner on Vaillant MAG 125 series appliances, sustaining the standing flame that lights the main burner. It is a small, precision-drilled component and the orifice size must match the appliance it is fitted to.

• The pilot flame will not stay lit, or goes out shortly after the burner is released.
• The pilot flame is weak, yellow, or visibly smaller than it should be.
• The pilot flame lifts, flickers excessively, or burns erratically.
• The nozzle is visibly blocked, corroded, or the orifice has been enlarged or damaged by cleaning.
• Repeated pilot ignition faults that persist after the pilot assembly has been cleaned.

• Confirm the appliance model and variant against the fitment list above.
• Check the existing nozzle marking to confirm the 0.25 mm orifice size is correct for your appliance.
• Inspect the pilot assembly for any other worn components before ordering, as a blocked or damaged nozzle is often accompanied by other faults.
• Gas work must be carried out by a competent, registered engineer.