Lochinvar & A.O. Smith 100281571 Thermopile Assembly

When you're dealing with a pilot that won't stay lit or a gas valve that refuses to engage on a Lochinvar or A.O. Smith unit, the 100281571 Thermopile Assembly is the critical millivolt replacement part you need. This OEM thermopile is engineered to convert thermal energy from the pilot flame into a precise electrical signal, typically around 750 millivolts, to power the electromagnetic coil within the gas control valve. It is a vital component for natural gas water heaters and select boiler models where a consistent, low-voltage current is required for safe millivolt ignition systems. Built for high-heat durability, this thermopile generator ensures the system maintains circuit continuity and prevents nuisance shutdowns caused by weak or fluctuating voltage output. As a direct genuine replacement part, it eliminates the compatibility guesswork often found with universal alternatives, maintaining the pressure and safety standards of the original equipment. Rely on this assembly to restore the pilot-to-main-burner sequence and keep your residential or light commercial heating equipment operating at peak efficiency.

Key Benefits for Professionals

• OEM Compatibility: Precision-fit for Lochinvar and A.O. Smith natural gas water heaters, ensuring direct integration with existing gas valve harnesses.
• Stable Millivolt Output: Delivers the consistent 750mV signal required for reliable solenoid activation and steady burner operation.
• High-Heat Resilience: Constructed with robust materials to withstand constant pilot flame exposure without premature degradation or signal loss.
• Optimized Ignition Sequence: Facilitates rapid heat-to-electricity conversion to reduce start-up delays and prevent ignition lockout errors.
• System Safety: Operates as a fail-safe by ensuring gas flow only occurs when the pilot flame is sufficiently hot, protecting the heat exchanger and burner assembly.

Common Questions

What are the symptoms of a failing 100281571 thermopile?
If the pilot light ignites but the main burner fails to kick on, or if the pilot goes out as soon as you release the control knob, the thermopile is likely not generating the required millivolts. Professionals should test the output with a multimeter to verify it meets the minimum threshold for the specific gas valve.

Is this part compatible with Louise and A.O. Smith Propane (LP) units?
This specific model is primarily documented for use in natural gas water heater applications. Always verify the specific orifice and assembly requirements for LP conversions before installation to ensure safe combustion.

How do I clean the thermopile before deciding to replace it?
You can gently use a fine abrasive cloth to remove carbon buildup from the tip. However, if the internal elements are compromised, cleaning will not restore the millivolt signal, and a full thermopile assembly replacement is necessary.

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.