Worcester Bosch Fan Assembly 24i Junior 87161056520

The Worcester Bosch 87161056520 is a fan assembly used in the Worcester 24i Junior and 28i Junior RSF range of gas boilers. It draws combustion air into the burner and pushes the products of combustion out through the flue, so the boiler can fire safely and hold a stable flame. Because it sits at the heart of the combustion circuit, a worn or seized fan quickly shows up as poor ignition, noise or a lockout.

• The fan runs noisily, with rumbling, scraping or whining from the bearings.
• The fan does not spin up when the boiler is called for heat, or spins intermittently.
• The boiler locks out or fails to ignite, often with a fan or air pressure related fault code.
• Repeated overheat trips or a boiler that fires briefly and then shuts down.
• Visible damage, stiffness or contamination around the fan impeller or housing.

• Confirm the appliance model and GC number against the compatibility list, as the 24i and 28i Junior variants use different configurations.
• Check the numbers on the existing fan against 87161056520 and the alternative numbers listed above before ordering.
• Inspect the fan mounting gasket or seal and replace it if it is compressed, torn or perished, so the combustion circuit stays airtight.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.