Lochinvar & A.O. Smith 100108943 Pilot

The Lochinvar & A.O. Smith 100108943 Pilot Assembly is a critical OEM replacement component designed for high-efficiency commercial boilers and water heaters. Engineered for natural gas pilot burner applications, this assembly ensures reliable ignition and precise flame rectification for the control module. This specific part is frequently utilized in Lochinvar Knight and Armor series, as well as various A.O. Smith Cyclone models. As a field-ready solution for hot surface ignition or spark-to-pilot configurations, it features a durable electrode and ground strap construction capable of withstanding high combustion chamber temperatures. Maintaining the integrity of the pilot orifice and electrode gap is essential for preventing nuisance lockouts and ensuring optimal flame signal strength. Replacing a fouled or cracked pilot assembly with this genuine 100108943 kit restores factory-spec startup timing and stabilizes the pilot flame under high-fire transitions.

Key Technical Benefits

• Direct OEM Compatibility: Ensures seamless fitment and electrical connector alignment in Lochinvar and A.O. Smith commercial units.
• Enhanced Flame Sensing: High-grade ceramic insulation prevents signal leakage, maintaining consistent microamp readings at the controller.
• Durable Construction: Built to resist carbon buildup and thermal stress, reducing boiler maintenance intervals.
• Precision Gas Flow: The integrated natural gas pilot orifice provides a stable flame pattern for consistent main burner crossover.

Common Professional Questions

How do I troubleshoot a weak flame signal on this pilot?
Verify the resistance across the electrode and ensure the pilot assembly is properly grounded to the burner plate. Inspect the ceramic insulator for hairline cracks that may cause high-voltage leakage during the ignition sequence.

Is this pilot assembly compatible with propane (LP) units?
This specific part is calibrated for natural gas precision speed applications. For LP conversions, the orifice must be replaced with the appropriate liquid propane diameter to maintain the correct stoichiometric ratio.

What causes premature failure of the 100108943 pilot?
Continuous exposure to moisture in the combustion air or excessive combustion chamber pressure can lead to electrode degradation. Regular inspection of the ignition lead wire for heat damage is recommended during annual service.

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.