Lochinvar & A.O. Smith 100108926 Gas Valve

The Lochinvar & A.O. Smith 100108926 Gas Valve is a critical OEM replacement part engineered for high-performance gas water heaters, specifically designed for 40 and 50-gallon hot surface ignition residential units. This 24v gas control valve is factory-calibrated for natural gas water heaters with a 4" WC manifold pressure setting and features a standard 1/2" inlet/outlet connection. As a veteran-grade component, the 100108926 utilizes an integrated microprocessor-based control system to manage precise temperature regulation and ignition sequences, ensuring optimal thermal efficiency. Technicians will find the LED status indicator invaluable for rapid field diagnostics and error code troubleshooting. This genuine A.O. Smith replacement valve provides the necessary pilot gas regulation and redundant safety shut-off required to maintain compliance with federal energy standards and flammable vapor ignition resistance (FVIR) protocols. For a successful install, verify that the existing thermopile assembly and burner orifices match the technical specifications of this 100108926 natural gas control.

• Integrated Diagnostics: The built-in LED status light provides real-time feedback and simplified troubleshooting for common ignition issues.
• Precise Pressure Management: Pre-set to 4" WC for natural gas, ensuring consistent burner performance and fuel-to-air mixtures.
• Direct OEM Fit: Specifically designed for A.O. Smith and Lochinvar balanced flue and direct vent residential gas models.
• Enhanced Safety: Redundant valve seats and electronic logic prevent unintended gas flow in the event of component failure.

What does it mean if the LED on the 100108926 is not flashing?
If the pilot is lit but the status light is dark, it typically indicates an electrical issue or a failing thermopile. Test for a minimum of 350mV at the connector terminals before assuming the valve itself has failed.

Can this gas valve be used for LP conversions?
No, this specific model (100108926) is factory-configured for natural gas at 4" WC. Professional field technicians should always use the specific LP version or a manufacturer-approved conversion kit to prevent over-firing.

How do I resolve a "Thermal Switch Tripped" error code?
A tripped thermal switch usually points to an air supply or venting restriction. Inspect the flame arrestor and intake vents for debris to ensure sufficient combustion air before resetting the system.

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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.