Always cross-reference your specific appliance model number with the parts list to ensure this is the correct HVACR replacement part for your unit

For technicians working on high-input systems

The Reznor 257975 Control Board is a critical direct spark ignition (DSI) control designed for heavy-duty HVAC unit heaters and professional-grade gas-fired heating systems

This robust valve body includes the specialized "S" Insert

and commercial water heaters where consistent fuel delivery is critical for thermal efficiency

Lochinvar & A.O. Smith 100276784 Board 322838-753 Always cross-reference your specific applianceAs a seasoned technician, you know that the Lochinvar & A. O. Smith 100276784 Integrated Control Board is the primary intelligence behind high efficiency gas water heaters and hydronic heating systems. This OEM circuit board replacement is designed to manage critical parameters including ignition control, flame sensing, and temperature regulation to ensure peak operational safety and fuel economy. Engineered for seamless integration, this digital