Worcester Bosch Pressure Differential Switch CDi 87161165430

The Worcester Bosch 87161165430 is a pressure differential switch used in the hydraulic and manifold assembly of Worcester CDi boilers. It senses the pressure difference across the water circuit and passes that signal to the boiler controls, allowing the appliance to regulate its operation correctly. It is a serviceable component within the hydraulic group rather than a consumable, and it is listed by Worcester Bosch under hydraulic and manifold components.

• The boiler fails to fire or locks out during a demand for heating or hot water.
• The pump runs but the burner does not ignite, or ignition is intermittent.
• Fault codes relating to pressure or water circulation appear on the display.
• Heating and hot water output becomes erratic, with the appliance cycling on and off.
• The boiler shuts down shortly after start-up and requires a reset to run again.

• Check the GC number and model on the appliance data badge against the compatibility list before ordering.
• Confirm the part number on the existing switch matches 87161165430 or one of the previous numbers listed below.
• Inspect the hydraulic assembly for seals and gaskets that may need renewing at the same time as the switch.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.