Worcester Bosch Fan Wheel 108 x 42 x 8 87161570000

The Worcester Bosch 87161570000 is a fan wheel, also called an impeller, used in the combustion air fan assembly of Worcester Bosch oil-fired appliances. It carries the ST108 designation and measures 108 x 42 x 8 mm. The wheel draws combustion air through the burner and pushes flue gases out of the appliance, so its balance and condition directly affect combustion quality.

• Excessive noise or a rhythmic vibration from the fan area during start-up or running.
• Visible damage to the vanes, such as cracks, distortion, erosion or a build-up of deposits that cannot be cleaned off.
• The wheel rubbing against the fan housing or sitting loose on the motor shaft.
• Combustion readings that drift outside the expected range, or repeated lockouts on the appliance.
• A wheel that has been removed and found to be out of balance when spun by hand.

• Confirm the appliance model and serial number against the compatibility list, as the same part number can appear across several oil appliance ranges.
• Compare the ST108 marking and the 108 x 42 x 8 mm dimensions with the wheel already fitted before ordering.
• Inspect the fan motor, shaft and housing at the same time, since wear in these components can affect a new wheel.
• Check the condition of any gasket or seal disturbed during removal and replace it if it is no longer serviceable.