Lochinvar & A.O. Smith 100112330 Pilot/Thermopile

When you are troubleshooting a Natural Gas water heater that will not maintain a pilot flame or trigger the main burner, the Lochinvar & A.O. Smith 100112330 Pilot/Thermopile Assembly is the professional-grade solution for a direct replacement. This OEM pilot assembly kit is engineered for high-performance millivolt systems, specifically replacing the obsolete 100078039 and 9007876005 part numbers. It includes the pilot burner, a high-output thermopile, and necessary pilot tubing with a ferrule nut for a secure, leak-free connection. Designed for 300 and 301 series residential units, this 100112330 assembly ensures consistent thermal-to-electrical energy conversion to hold the gas valve solenoid open. As a veteran technician knows, maintaining a minimum of 350mV is critical for reliable pilot ignition and status light operation. This kit is strictly for Natural Gas (NG) applications and provides the precise fit required for FVIR-compliant combustion chambers across A.O. Smith, Lochinvar, State, and Reliance brands.

• Direct OEM Compatibility: Ensures a drop-in fit for A.O. Smith GS6, GCV, and GPX models, eliminating field modifications.
• Complete Replacement Kit: Includes the pilot tube and thermopile to address common failure points like carbon buildup or internal resistance.
• Verified Performance: Restores the millivolt signal required for the electronic gas control valve to function without nuisance shutdowns.
• Technical Integrity: Manufactured to original specifications to maintain the flame arrestor safety standards of the water heater.

• What are the signs that my thermopile has failed? If the pilot lights but the status light does not flash, or if the flame reaches the sensor but the valve closes upon releasing the knob, the thermopile is likely failing to produce the required DC millivolts.
• Is this assembly compatible with Propane (LP) units? No, this is a Natural Gas pilot assembly. Using NG components in LP systems creates a significant safety hazard due to different orifice sizing.
• Will this fix a 100078039 pilot assembly? Yes, the 100112330 is the official direct replacement for 100078039 and is the current standard part for those older systems.

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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.