Lochinvar & A.O. Smith 100208371 Thermocouple

Maintaining a reliable pilot flame on high-recovery units requires a high-performance Lochinvar & A.O. Smith 100208371 Thermocouple. This 36-inch heavy-duty water heater thermocouple replacement is engineered specifically for Copper-Fin CW 180-270 water heaters and boilers. As a critical safety component, it generates the millivolt signal necessary to hold the gas control valve open during operation. If your burner fails to stay lit or the pilot drops out under load, this OEM replacement part is the standard solution. It is physically and functionally identical to PLT2904 and PLT2904K, ensuring a precise fit without the need for field modifications. Designed for the high-demand environments of commercial boiler rooms, this gas valve thermocouple provides rapid response times and consistent thermal conductivity. Utilizing genuine Lochinvar parts ensures that your equipment maintains its original safety listing and operational integrity, preventing hazardous gas accumulation and unnecessary downtime on the job site.

• Universal Compatibility: This component serves as a direct drop-in for PLT2904 and PLT2904K models.
• Industrial Build: Features a 36-inch lead length to accommodate the combustion chamber dimensions of Lochinvar Copper-Fin series 180 through 270.
• Enhanced Safety: Provides the critical millivolt output required to secure the gas control valve against unintended flame failure.
• Optimized Conductivity: Manufactured with high-grade alloys to withstand the intense heat cycles of high-recovery commercial water heaters.

Why will my water heater pilot not stay lit?
A common failure point is a degraded 100208371 thermocouple that no longer generates sufficient millivolts to energize the gas valve solenoid. Replacing the old sensor typically restores consistent pilot operation.

Is the 100208371 compatible with PLT2904K?
Yes, the 100208371 is the official manufacturer replacement for both PLT2904 and PLT2904K, featuring the same 36-inch length and connection threads.

How do I test a Lochinvar thermocouple?
Technical personnel should perform a millivolt drop test using a multimeter. If the thermocouple produces less than 20-30mV under an open-circuit flame test, the part is likely failing and requires replacement.

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.