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Worcester Bosch Diverter Valve Assembly Greenstar ErP Compact 87377046110

Worcester Bosch

Worcester Bosch Diverter Valve Assembly Greenstar ErP Compact 87377046110

At a glance

  • Part type: Diverter valve assembly (diverter and motorised valves)
  • Also known as WB87377046110, 1031017
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87377046110
GC number
J23-568
Showing prices

£114.85

£95.71 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Worcester Bosch diverter valve assembly, part number 87377046110, is a directional water valve used in Greenstar ErP and Compact combi boilers. It routes heated primary water either into the central heating circuit or through the domestic hot water heat exchanger, which is how a combi provides both heating and hot water without a storage cylinder. The assembly is listed by Worcester Bosch as a replacement component for the appliance models shown in the compatibility list.

Signs this part needs replacing

  • No hot water at the tap while the boiler still fires and heats the radiators
  • Radiators warming up when a hot water tap is opened
  • Domestic hot water running lukewarm or fluctuating in temperature
  • The valve sticking, with the actuator motor failing to move it through its full travel
  • Boiler locking out or displaying a fault when it switches between heating and hot water

Before you order

  • Check the GC number and the appliance serial plate to confirm the model appears in the compatibility list.
  • Cross-check the part number against the alternative numbers 1031017 and WB87377046110 before ordering.
  • Inspect the valve seating and seals on removal; a gasket or seal kit may be needed to complete the repair.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.