Lochinvar & A.O. Smith 100145003 Fan Assembly

The Lochinvar & A.O. Smith 100145003 Fan Assembly is a high-performance combustion blower engineered for precise air-fuel ratio management in commercial water heaters and boilers. This direct replacement blower motor assembly is identical to part number FAN3030 and serves as a critical component for maintaining consistent thermal efficiency. Designed for compatibility with high-efficiency Lochinvar Knight and A.O. Smith Cyclone series, this assembly ensures the combustion chamber receives the exact static pressure required for optimal burner performance. Constructed with heavy-duty bearings and a balanced impeller, the 100145003 mitigates vibration and mechanical wear during high-cycle demands. As a technician-grade HVAC replacement part, it facilitates the necessary pre-purge and post-purge cycles crucial for safe venting operations. When replacing this combustion fan, ensure the mounting gasket is inspected to prevent flue gas leakage and maintain proper manifold pressure across the heat exchanger.

Key Benefits

• Direct OEM Interchange: Seamlessly replaces 100145003 and FAN3030, ensuring exact electrical housing and bolt-pattern alignment.
• Enhanced Combustion Efficiency: Maintains precise RPM for stable air-fuel premix, reducing carbon buildup on igniters and flame sensors.
• Industrial Build Quality: High-torque motor designed to handle the variable speed demands of modulating condensing boilers.
• Critical Safety Integration: Integrated electronics communicate with the control board to verify airflow before ignition sequences begin.

Common Questions

Is the 100145003 compatible with both natural gas and propane configurations?
Yes, this fan assembly is designed to work within the combustion systems of both NG and LP units, provided the gas valve and orifice are calibrated to manufacturer specifications.

How do I verify if my current blower motor is failing?
Common indicators include unexpected control board lockout codes related to "Airflow Fault" or "Fan Speed Error," as well as audible bearing whine or failure to initiate the pre-purge cycle.

Does this assembly include the replacement mounting gasket?
Standard 100145003 units are the blower assembly itself; it is highly recommended to source a new silicone or graphite gasket to ensure a gastight seal during installation.

This item is not eligible for free shipping.

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.