Worcester Bosch Pump Assembly Greenstar i ErP 8716117400

This is a Worcester Bosch pump assembly supplied as a complete unit for the Greenstar i and Greenstar i System ErP boiler range. It sits after the primary heat exchanger and drives heated water around the sealed heating circuit. On combi versions the pump is positioned ahead of the diverter valve so it can circulate water through both the domestic hot water and central heating sides of the appliance.

• The pump runs noisily, grumbles or hums louder than usual
• Radiators stay cold or heat unevenly while the boiler is firing
• The boiler overheats, locks out or cycles shortly after ignition
• Domestic hot water runs cold on combi models despite the burner lighting
• The pump head does not turn or the appliance reports a circulation fault

• Check the GC number and serial plate on the appliance to confirm the model matches the compatibility list
• Cross-check the part number against any number already fitted to the boiler
• Inspect the pump seals and gaskets and order replacements if the joint faces are marked
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.