Lochinvar & A.O. Smith 100165931 Flame Sensor

When you're dealing with a lockout on a high-efficiency condensing unit, the Lochinvar & A.O. Smith 100165931 Flame Sensor is a critical component to inspect. This genuine OEM flame sensor is identical to PLT3023 and comes complete with the necessary gasket to ensure a pressurized seal during installation. Designed specifically for industrial and commercial applications, this HVAC replacement part is the standard for Knight XL (KBN601-801), Armor (AW601-801), and Sync (SBN/L) series boilers or water heaters. As a veteran tech knows, reliable flame rectification is non-negotiable for safe operation; this sensor monitors the burner and sends the microamp (µA) signal back to the integrated control board to verify ignition. Utilizing a high-grade rod and durable ceramic insulator, the 100165931 prevents unburned gas accumulation and nuisance shutdowns. Whether you are performing a furnace repair or routine maintenance, replacing a fouled or cracked flame sensing rod with this OEM boiler part ensures the system meets its original combustion specifications and maintains peak efficiency across the heat exchanger.

• Direct OEM Replacement: Fully compatible with Lochinvar and A.O. Smith commercial systems, replacing part numbers 100165931 and PLT3023.
• Full Kit Inclusion: Includes the flame sensor gasket to maintain combustion chamber integrity and prevent air leaks.
• Broad Compatibility: Engineered for high-output models, including Knight XL KBN601-801 and Armor AW601-801 condensing units.
• Industrial Durability: Designed to withstand the high-temperature environment of commercial water heaters and pool heaters like the AQUAS XP.

• How do I troubleshoot a 100165931 flame sensor? Use a multimeter to measure the DC microamp (µA) signal; a healthy sensor typically outputs between 1.0 and 5.0 µA under a steady flame.
• Can I clean the rod instead of replacing it? While light cleaning with an abrasive pad can remove carbon buildup temporarily, a pitted or cracked ceramic insulator requires a total flame sensor replacement to prevent grounding issues.
• Is the gasket necessary for installation? Yes, the gasket is vital for maintaining the correct air-to-fuel ratio and preventing exhaust gas leakage from the burner plate.

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.