Worcester Bosch Pump SGRE2W 7MH CH 8716117628

This is a Worcester Bosch circulation pump, supplied under part number 8716117628 and identified on the casing as SGRE2W 7MH CH 9H HU1. It is the pump that moves primary water around the heating circuit and through the boiler's heat exchanger, so it runs whenever there is a demand for heating or hot water. The part is used across the Worcester Bosch Greenstar Si and i Compact families, including LPG and natural gas variants.

• The boiler fires but the radiators stay cold while the flow and return pipes at the boiler remain cool
• Grinding, whining or rumbling noise from the pump housing, or a pump that is audible in short bursts only
• The pump body is hot to touch but the impeller is not turning, or the shaft cannot be rotated by hand
• Repeated overheat or low water pressure faults, or the boiler locking out shortly after a demand starts
• Water weeping from the pump body, flange or gland area

• Check the GC number on the appliance data badge against the compatibility list, as the same boiler range can use more than one pump variant
• Confirm the number on the pump being removed matches 8716117628, 1030811 or one of the previous numbers listed above
• Check whether the pump flange gasket or sealing O-ring is reusable before refitting; a replacement seal should be fitted if the old one is compressed or damaged
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.