Lochinvar & A.O. Smith 100145004 Fan Assembly

The Lochinvar & A.O. Smith 100145004 Fan Assembly is a direct OEM combustion blower designed for high-efficiency commercial boilers and water heaters. Engineered to maintain precise air-to-fuel ratios, this 100145004 combustion fan ensures stable flame signals and optimal thermal output across various firing rates. This specific assembly is a drop-in replacement for part number FAN3031, featuring a robust brushless motor design that handles the high static pressure requirements of modern sealed combustion systems. For technicians performing annual boiler maintenance, this unit provides the necessary RPM feedback to the integrated control board to prevent modulation errors or soft-lockout codes. Whether you are servicing a Lochinvar Knight or a comparable A.O. Smith Cyclone model, this replacement combustion blower restores the required manifold pressure for clean combustion. Verified compatibility includes various commercial water heater parts and heating boiler configurations where 120V/60Hz power and PWM control are standard.

Key Benefits

• OEM Compatibility: Cross-referenced directly with Lochinvar FAN3031 for seamless mechanical and electrical integration.
• Precision Modulation: Optimized for variable-speed operation to maintain consistent CO2 levels throughout the modulation range.
• Durable Construction: Heavy-duty housing and balanced impeller wheels minimize vibration and extend the service life of the fan assembly.
• Direct Plug-and-Play: Features standard wiring harnesses to reduce downtime during emergency HVAC repairs.

Common Questions

Is the 100145004 fan assembly compatible with FAN3031?
Yes, the 100145004 is the current manufacturer part number and is functionally identical to the FAN3031 combustion blower.

What are the symptoms of a failing Lochinvar combustion motor?
Common indicators include "Fan Speed Not Met" error codes, excessive bearing noise during the pre-purge cycle, or a failure to establish a flame due to insufficient airflow.

Does this assembly include the mounting gasket?
Typically, the blower is sold as a standalone unit. It is standard practice for contractors to inspect and replace the mounting gasket to ensure a gas-tight seal on the boiler burner plate.

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.