Worcester Bosch Burner Assembly WB7 871860023B0

The Worcester Bosch 871860023B0 is a WB7 burner assembly for Worcester Bosch Greenstar gas boilers. It sits at the heart of the combustion process, presenting the gas and air mixture at the burner head so the appliance can light and burn cleanly under modulated demand. The assembly is supplied as a complete burner unit and is listed under the burner and burner controls category of the Worcester spares range.

• Repeated lockouts or ignition failures where the burner will not establish a stable flame.
• A yellow, lazy or sooty flame instead of a clean blue flame, with deposits forming on the burner head.
• Flame lift, flame instability or a burner that drops out once the appliance modulates.
• Combustion readings drifting outside the expected range, with carbon monoxide rising on the flue gas analyser.
• Visible cracking, corrosion, distortion or heat damage across the burner surface or its mountings.

• Check the GC number and model on the appliance data plate against the compatibility list, as the same boiler family can use different burner variants.
• Cross-check the alternative number 1030925 against the part you are removing before ordering.
• Confirm whether a gasket or seal is required for the burner mounting so the joint can be remade correctly on reassembly.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.