Lochinvar & A.O. Smith 100108268 Thermocouple

The Lochinvar & A.O. Smith 100108268 Thermocouple is a critical safety component designed for precise flame rectification in commercial and residential water heating systems. This 24-inch thermocouple provides the necessary millivolt signal to the gas valve, ensuring the pilot flame is established before allowing the main burner to cycle. Engineered for high-temperature environments, it is a direct replacement for various Lochinvar pilot assemblies and A.O. Smith water heater parts. As a standard universal thermocouple style adapted for specific OEM specifications, it features a threaded nut for secure placement within the pilot bracket. Technicians should verify the K-lead connection and lead length to ensure compatibility with existing gas valve safety circuits. Replacing a degraded 100108268 restores reliable pilot monitoring, preventing nuisance equipment lockouts and ensuring optimal system uptime in high-efficiency boiler applications.

Key Benefits

• 24-inch lead length provides sufficient reach for standard manifold configurations and deep combustion chambers.
• Compatible with a wide range of Lochinvar and A.O. Smith commercial water heaters and boilers.
• Constructed with durable alloys to withstand constant pilot flame impingement without premature oxidation.
• Ensures accurate millivolt output to maintain gas valve hold-in coils, reducing service calls for pilot outages.
• Standard threaded connection allows for fast installation and reliable electrical grounding.

Common Questions

What is the output voltage for the 100108268 thermocouple?
This component typically generates a 20 to 30 millivolt signal when heated by a steady pilot flame. If the reading drops below 10-12 millivolts under load, the gas valve may drop out.

Can I use the 100108268 for both Natural Gas and Propane units?
Yes, this thermocouple is designed to function with both fuel types, provided the pilot burner assembly correctly positions the flame over the top 1/2-inch of the tip.

What causes this thermocouple to fail prematurely?
Common issues include excessive soot buildup, improper flame positioning, or over-tightening the connection nut at the gas valve, which can damage the internal copper lead insulation.

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.