Lochinvar & A.O. Smith 100165854 Pilot Assembly

The Lochinvar & A.O. Smith 100165854 Pilot Assembly is a direct replacement component engineered for high-efficiency natural gas water heaters. This assembly includes the thermopile, pilot tube, and electrode, ensuring a reliable millivolt ignition sequence and consistent flame sensing. It is an exact cross-reference for part numbers PLT1140 and 239-41323-01. Designed for heavy-duty commercial and residential applications, it maintains the precise pilot orifice alignment required to prevent nuisance lockouts and thermocouple failure. When diagnosing pilot light won't stay lit issues or gas valve signal errors in Lochinvar or A.O. Smith units, this factory-spec assembly restores thermal conductivity and signal integrity. The robust construction handles high combustion chamber temperatures, ensuring the pilot burner remains stable under varying gas pressures. This is a critical component for maintaining the ANSI Z21.10.3 standards for gas-fired water heaters.

• OEM Compatibility: Precision-fit for Lochinvar and A.O. Smith models, eliminating the need for field modifications.
• Complete Assembly: Includes the pilot bracket, thermopile, and tubing for a faster swap-out during service calls.
• Improved Signal Reliability: High-grade sensors prevent voltage drop to the gas control valve, reducing callbacks.
• Natural Gas Optimized: Calibrated specifically for NG combustion profiles to ensure a clean, blue pilot flame.

Is this pilot assembly compatible with propane (LP) units?
No, the 100165854 is strictly for natural gas water heaters. Using this on an LP system will cause improper combustion due to the orifice sizing.

Does this replace the 239-41323-01 found in Bradford White or technical manuals?
Yes, this assembly is the direct equivalent to 239-41323-01 and PLT1140, meeting all original equipment specifications for fit and millivolt output.

Why is my new pilot sparking but not igniting the main burner?
Check the thermopile output; if the millivolt signal is below the required threshold for the gas valve, the main burner will not engage. Ensure the pilot flame is fully engulfing the sensor tip.

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.