Lochinvar & A.O. Smith 100109957 Blower Assembly

The Lochinvar & A.O. Smith 100109957 Blower Assembly is a factory-authorized OEM component engineered for high-recovery FPSH 75 water heater models. As a critical part of the combustion system, this forced draft blower ensures precise air-to-fuel ratios and consistent venting of flue gases. This assembly is the direct successor to multiple discontinued part numbers, including 9004581105, 194509-00, and 195841-000, allowing for seamless integration without field modifications. Designed for the rigors of commercial and high-demand residential applications, it features a heavy-duty motor housing and balanced impeller to minimize vibration and bearing wear. Replacing a failing power venter with this specific Lochinvar blower assembly restores factory-spec static pressure, preventing common pressure switch fault codes and ensuring safe ignition sequences in A.O. Smith power vent water heaters. For technicians servicing 75-gallon power shot units, this direct-fit replacement motor is the standard for maintaining UL/CSA certified performance.

Technical Benefits for Professionals

• Direct OEM Compatibility: Engineered specifically for FPSH 75 series, eliminating the need for mounting adjustments or wiring harness adapters.
• Enhanced Combustion Airflow: Precision-balanced blower wheel optimizes draft induction, reducing carbon buildup on burner assemblies.
• High-Temperature Durability: Thermal-overload protected motor designed to operate within the high-ambient environments of water heater cabinets.
• Versatile Cross-Reference: Consolidates inventory by replacing legacy part numbers 194509, 195841, and 9004581105.
• Restored System Efficiency: Corrects water heater blower motor noise and low airflow issues that trigger safety shutdowns.

Common Questions

Does this assembly include the pressure switch?
This part number typically covers the blower housing and motor assembly. Technicians should inspect the existing pressure switch and tubing for blockages or diaphragm fatigue during installation.

What are the symptoms of a failing 100109957 blower?
Common indicators include a loud grinding noise from the bearings, a failure of the unit to initiate the pre-purge cycle, or specialized error codes indicating a pressure switch circuit failure.

Is this compatible with 50-gallon FPSH models?
No, this specific assembly is calibrated for the airflow requirements of the FPSH 75. Using an incorrect blower can lead to improper combustion and hazardous venting conditions.

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.