Lochinvar & A.O. Smith 100108891 Blower Fan

As a seasoned technician, you know that the Lochinvar & A.O. Smith 100108891 Blower Fan is a critical component for maintaining the precise air-to-fuel ratio required in high-efficiency forced draft boilers. This OEM blower assembly, often cross-referenced with part numbers 9002669005 and 0012400490, is engineered to handle the rigorous demands of combustion air delivery and effective flue gas removal. Featuring a single-phase motor rated at .05 HP and approximately 3000 RPM, this unit ensures stable static pressure and consistent thermal output. Whether you are performing a routine HVAC maintenance call or an emergency blower motor replacement, this genuine part offers the exact fitment and 3-pin configuration needed to interface with the factory control board without modifications. Its balanced blower wheel and durable housing construction are designed to minimize vibration and prevent premature bearing failure, ensuring the unit operates within peak performance parameters for residential and light commercial hydronic systems.

Key Benefits

• Ensures optimal combustion efficiency by maintaining precise airflow for forced draft heating systems.
• Direct OEM replacement for Lochinvar and A.O. Smith units, eliminating common field-fit alignment issues.
• High-speed 3000 RPM motor provides the necessary torque to overcome vent restriction and ensure safety switch closure.
• Compact 6.2 lb assembly allows for easier handling and installation in tight boiler cabinets.
• Original factory specifications maintain the UL/CSA listing integrity of the entire heating appliance.

Common Questions

Is this blower fan compatible with my specific boiler model?
The 100108891 is a dedicated direct-drive blower designed specifically for select Lochinvar and A.O. Smith forced draft boilers. Always verify the part number on your existing inducer or motor nameplate before ordering to ensure correct electrical and mounting alignment.

What are the signs that my current blower motor is failing?
Typical failure symptoms include excessive mechanical noise, "F09" or "Air Pressure Switch" fault codes, or the motor failing to spin despite receiving a 120V signal from the integrated control board. If the blower wheel does not spin freely by hand when the power is disconnected, the bearings have likely seized.

Does this assembly include the necessary gaskets?
This SKU generally includes the blower fan and motor assembly. As a best practice, technicians should inspect the mounting gasket for degradation; if the existing gasket is compressed or torn, a separate blower gasket (such as part 100208101) should be used to prevent combustion gas leaks.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.