Worcester Bosch Diverter Adapter Assembly 8716117459

The Worcester Bosch 8716117459 is a diverter adapter assembly, part of the diverter valve and hydraulics group inside Greenstar Highflow CDi ErP combi boilers. It forms the connection between the diverter valve body and the surrounding hydraulic components, allowing the boiler to switch the flow of primary water between the central heating circuit and the domestic hot water plate heat exchanger. It is a serviceable component, so it can be replaced without disturbing the rest of the hydraulic block.

• Domestic hot water runs cold or only warms intermittently while the heating works normally
• Heating water passes into the hot water circuit, or hot water temperature fluctuates at the tap
• The boiler fails to switch cleanly between heating and hot water demand
• Water weeping or staining around the diverter valve and adapter joint
• Repeated lockouts or flow errors when a hot water tap is opened

• Check the GC number and appliance serial plate to confirm the boiler model before ordering
• Compare the part number on the existing component against 8716117459 and the alternative number 2244561
• Inspect the adapter joint and seals, and renew any gasket or O-ring that shows hardening or flattening
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.