Worcester Bosch Pump Head 8716117577

The Worcester Bosch 8716117577 is a replacement pump head for the circulating pump used across the Greenstar range of condensing boilers. It carries the motor and impeller that drive water around the heating circuit and, on combi and system models, the primary side of the domestic hot water circuit. It is supplied as a head assembly, so it mounts onto the pump body already fitted to the appliance.

• No heating or no hot water, with the boiler firing but the radiators staying cold
• The pump head running hot to the touch, or a humming, grinding or rattling noise from the pump area
• The boiler locking out or showing a circulation-related fault code shortly after start-up
• Radiators heating unevenly, or the flow and return pipework staying cool while the boiler runs
• The pump head failing to turn when the appliance is calling for heat

• Check the appliance GC number and model against the compatibility list, as the same pump head is used across several Greenstar variants
• Confirm the part number on the existing pump head matches 8716117577 before ordering
• Check whether a gasket or seal kit is needed for the pump body joint, as these are not always supplied with the head
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.