Lochinvar & A.O. Smith 100278133 Pilot Assembly

The Lochinvar & A.O. Smith 100278133 Pilot Assembly is a critical combustion component for maintaining reliable ignition and flame sensing in high-efficiency commercial and residential water heaters. As a factory-authorized OEM heating part, the 100278133 ensures precise gas flow and millivolt output, securing the burner cycle against intermittent dropouts. This specific assembly serves as the updated, direct replacement for 100165902, featuring advanced metallurgy to resist thermal fatigue and carbon buildup. Integrating the thermocouple/thermopile and igniter into a single unit, it simplifies field service and restores system efficiency. This gas pilot assembly is designed for rapid installation, helping technicians avoid the nuisance lockouts common with worn sensing probes. When troubleshooting water heater pilot issues or flame rectification failures, swapping in this genuine Lochinvar pilot replacement ensures the unit operates within manufacturer pressure and voltage specifications, maintaining the safety and integrity of the combustion chamber.

• Verified Compatibility: Engineered as the precise direct replacement for 100165902, ensuring zero-clearance fitment during refurbishments.
• Enhanced Flame Rectification: Optimized for consistent signal strength to prevent premature gas valve closure and system downtime.
• Heavy-Duty Construction: Built to withstand high-velocity burner environments without warping or losing positional accuracy.
• Reduced Service Time: All-in-one assembly design allows for a quick swap-out, reducing labor costs for contractors on-site.

Is 100278133 compatible with older Lochinvar models?
Yes, this assembly is the manufacturer-specified upgrade for previous versions, including part number 100165902. Check your specific boiler or water heater serial number to ensure exact fitment.

What causes this pilot assembly to fail?
Standard wear factors include heavy oxidation on the sensing probe or clogged orifices from impurities in the gas line. Frequent water heater troubleshooting for pilot outages often points to the need for a full assembly replacement.

Can I use this for both Natural Gas and LP units?
This specific part is typically configured for standard gas applications. Always verify the orifice size against your unit’s rating plate for proper combustion safety.

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.