Lochinvar & A.O. Smith 100108462 Thermocouple

The Lochinvar & A.O. Smith 100108462 Thermocouple is a high-performance 18-inch thermocouple engineered for precision in residential and commercial gas water heater repair. This OEM water heater part (Model TC-K18) is a critical safety component designed to monitor the pilot flame and generate a consistent 30 millivolt output. High-grade copper construction ensures superior thermal conductivity and rapid response times, allowing the gas valve to remain energized under normal operating conditions or shut down immediately if the pilot is extinguished. Technical specifications confirm it replaces legacy part numbers 9000876, 9000876015, and 23673. This Lochinvar replacement part is compatible with A.O. Smith, State, Reliance, and Kenmore models, including the 650XODS and PR650XBDS series. For technicians, the 1/2" NPT connection and flexible lead allow for streamlined pilot assembly maintenance and reliable integration with standard White-Rodgers gas valves and other common burner configurations.

• Precise 30mV Signal: Ensures stable communication with the gas control valve to prevent nuisance outages.
• OEM Compatibility: Exact 100108462 burner part fitment for Lochinvar, A.O. Smith, and State Select water heaters.
• Rapid Flame Detection: Advanced thermal sensing technology detects pilot failure quickly to mitigate gas leakage risks.
• Enhanced Durability: Robust copper lead and reinforced connectors withstand high combustion chamber temperatures.

Is the 100108462 thermocouple compatible with both Natural Gas and LP units?
Yes, this 18-inch thermocouple is designed for use in both Natural Gas and Liquid Propane (LP) water heating systems provided the length and millivolt requirements match the original equipment specifications.

What are the symptoms of a failing 100108462 thermocouple?
Typical indicators include a pilot light that will not stay lit once the control knob is released or erratic burner cycles often caused by a degraded millivolt signal to the gas valve solenoid.

Can this be used as a universal replacement for longer leads?
While this is a common 18-inch standard, always verify the required lead length for your specific burner tray; a lead that is too short will not reach the valve, while an 18-inch lead should not be used to replace 24-inch or 36-inch factory requirements.

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.