Worcester Bosch 8716117417 Fan Assembly - NRG 118 - CDi/Si/Greenstar

The Worcester Bosch fan assembly, part number 8716117417, is the combustion fan fitted to Worcester Bosch gas boilers. It draws fresh air into the combustion chamber to support correct gas combustion, then drives the burnt gases out through the flue once combustion is complete. The boiler's safety interlock prevents gas reaching the main burner whenever the fan is not running correctly, so the fan is central to safe, reliable ignition and steady operation.

• The boiler locks out or fails to reach ignition, often with a fan or air pressure related fault code.
• The fan becomes noisy in use, with rumbling, grinding or a scraping sound from the fan housing.
• Repeated flame failure or ignition faults that clear briefly and then return.
• The boiler fires, then shuts down shortly afterwards because the fan cannot prove airflow.
• Visible damage, stiffness or play in the fan impeller when the housing is inspected.

• Check the model and GC number on the boiler data badge and compare it with the part number on the existing fan.
• Confirm the number on the failed fan matches 8716117417 or one of the alternative numbers listed.
• Inspect the fan mounting seals and gaskets while the assembly is removed and renew them if they are compressed or perished.