Worcester 8716119823 Pump Head 3 Speed

This is a Worcester Bosch circulating pump head, supplied under part number 8716119823. It is the motor and impeller assembly that drives water around the boiler's main and secondary heat exchangers, moving the heated water on to the radiators and the hot water outlet. It is a serviceable component on Worcester Bosch boilers, so the head can be renewed without disturbing the pump body where the hydraulic connections are made.

• The boiler fires but the radiators stay cold, or heat reaches only part of the system.
• The pump is noisy in operation, with rumbling, humming or a grinding note from the pump housing.
• The pump head runs hot to the touch or the boiler repeatedly locks out on a circulation or overheat fault.
• Hot water at the tap is intermittent or slow to arrive while the boiler is running.
• The pump head does not turn when the boiler calls for heat, or it turns only intermittently.

• Check the boiler model and serial number against the data plate, and confirm the part number stamped or labelled on the pump head you are replacing.
• Compare the numbers on the old component with the alternative numbers listed here, as Worcester Bosch has used more than one reference for this pump head.
• If the pump body is being opened to swap the head, inspect the gasket or seal at the mating face and renew it if it is compressed or damaged.
• Work on the boiler's water circuit and electrical connections should be carried out by a competent person, with the appliance isolated and the system drained or valved off as required.