Worcester Bosch Flow Switch Assembly 87161084010

The flow switch assembly is a Worcester Bosch spare that monitors water movement through the appliance and signals the control board when flow starts or changes. It sits in the hydraulic path of the boiler and provides the switching signal that tells the system to activate on a demand for hot water. This example carries part number 87161084010 and is listed against the Worcester CAM 5 Combi range.

• The boiler does not fire when a hot water tap is opened, despite the pump running.
• Domestic hot water is intermittent, cutting in and out during a draw-off.
• The appliance locks out or reports a fault shortly after a demand for hot water begins.
• The burner stays off while water continues to flow through the boiler.
• Flow is detected erratically, so the boiler cycles on and off without a consistent pattern.

• Confirm the appliance model and serial number against the compatibility list before ordering, as the same part number may not suit every Worcester Bosch boiler.
• Check the existing flow switch for the previous number BS50024 or the alternative number 1020411 to confirm you are replacing like for like.
• Inspect the surrounding seals and connections while the assembly is removed, and renew any that show signs of hardening or leakage.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.