Lochinvar & A.O. Smith 100145008 Fan Assembly

The Lochinvar & A.O. Smith 100145008 Fan Assembly is a critical OEM replacement combustion blower engineered for high-efficiency hydronic systems. This combustion fan assembly, which is a direct identical match for FAN3035, is purpose-built to maintain the precise fuel-to-air ratio required for clean ignition and stable modulation. Specifically designed for use in Knight XL KBN399-400 heating boilers and Knight WH400 wall-mount boilers, it also services AW399, XP400, and SNA400 series units. As a technical professional, you recognize that a failing blower often triggers BE-1 fault codes or "No Blower Feedback" errors, directly impacting heat exchanger performance. By installing this genuine Lochinvar 100145008, you ensure the motor’s RPM signals communicate accurately with the control board, preventing nuisance lockouts and ensuring optimal venting through the discharge flue. This assembly includes the necessary fan gaskets to seal the pressurized combustion chamber, effectively restoring the integrity of the forced draft combustion system.

• Precise Airflow Modulation: Corrects blower feedback errors and ensures stable combustion across all firing rates for Lochinvar Knight series.
• Direct OEM Compatibility: Serves as the exact factory replacement for 100145008 and FAN3035, eliminating the need for field modifications.
• Optimized Performance: Engineered to meet the high static pressure requirements of high-efficiency condensing boilers and water heaters.
• Integrated Sealing: Comes equipped with mounting gaskets to maintain a gas-tight seal at the venturi and heat exchanger interface.

Common Questions

What are the signs that my blower motor is failing?
Common indicators include a BE-1 or B2-70 fault code, excessive vibration, or "searching" for ignition. If the fan fails to reach the required pre-purge RPM, the control board will prevent the gas valve from opening for safety.

Is this part interchangeable with the 100145009?
No. While they appear similar, the 100145008 is specifically tuned for the 399-400k BTU/hr models. Using the incorrect assembly can lead to improper combustion, sooting, or system lockouts.

Do I need to replace the gaskets when installing this assembly?
Yes, it is standard practice for HVAC technicians to replace all seals. Using old, compressed gaskets can lead to combustion gas leaks or pressure switch failures.

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.