Lochinvar & A.O. Smith 100338897 Gasket

When you're dealing with a flame failure: running lockout on a Lochinvar or A.O. Smith unit, the integrity of the combustion seal is the first thing to check. The Lochinvar & A.O. Smith 100338897 Gasket is a critical OEM replacement part designed specifically to provide a high-temperature seal for the flame rod assembly. This flame rod gasket ensures that the interface between the sensor and the combustion chamber remains airtight, preventing vacuum leaks that can destabilize the flame signal or cause dangerous gas leakage around the burner door.

This part is the direct engineering successor to the older 100072809 model, offering improved thermal resistance to withstand the high-cycle demands of commercial and residential condensing boilers and water heaters. For any technician performing a Lochinvar boiler maintenance or replacing a fouled flame sensor, installing a fresh 100338897 is mandatory to prevent the melting of wiring harnesses or ignition failure due to gasket deterioration. Ensure exact HVAC replacement part compatibility by verifying your specific model and serial number before the swap.

• Ensures a precision seal for the flame rod to maintain stable flame rectification signals.
• Direct OEM replacement for the legacy 100072809, ensuring perfect fitment without modifications.
• High-temperature material construction prevents combustion gas leaks and protects sensitive external controls.
• Critical component for resolving boiler lockout codes related to flame sensing and ignition.
• Compatible with a wide range of Lochinvar Knight, Noble, and A.O. Smith high-efficiency units.

• When should I replace the flame rod gasket? It should be replaced during every annual burner inspection or whenever the flame rod is removed for cleaning to ensure a fresh compression seal.
• Will this fix a 'Flame Fail' error? If the error is caused by air bypassing the sensor or a compromised combustion seal, this gasket is the necessary fix.
• Is this part compatible with my A.O. Smith water heater? Yes, the 100338897 is a universal cross-brand part used across multiple A.O. Smith and Lochinvar hydronic platforms.

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.