Lochinvar & A.O. Smith 100330200 Flame Sensor

The Lochinvar & A.O. Smith 100330200 Flame Sensor is a critical OEM replacement part designed for high-efficiency commercial boilers and water heaters. Engineered for precise flame detection, this sensor monitors the burner's ionization current to ensure safe and continuous burner operation. A failing sensor often manifests as a short-cycling burner or a hard lockout with flame loss error codes. This 100330200 flame rod comes as a complete assembly, including the necessary high-temperature gasket and sealing grommet to prevent combustion air bypass and maintain combustion chamber integrity. It is primarily utilized in advanced systems like the Lochinvar Knight and A.O. Smith Cyclone Xi series. When replacing this component, ensure the mounting flange is free of debris to provide a reliable ground path for the microamp signal. Using genuine Lochinvar components ensures HVAC compatibility and prevents the premature carbon buildup commonly seen with universal or lower-quality flame rods that lack proper metallurgy for these high-Btu applications.

• OEM Precision: Specifically calibrated for Lochinvar Knight and A.O. Smith Cyclone models to ensure accurate microamp feedback.
• Airtight Seal: Includes a replacement gasket and grommet to prevent back-drafting and air leaks at the burner plate.
• Durable Construction: Built with high-grade alloys to withstand extreme thermal stress within the combustion assembly.
• Safety Compliance: Essential for preventing gas buildup by facilitating rapid flame failure shut-off.

• How do I know if my 100330200 flame sensor is faulty? If your system attempts to ignite but locks out after a few seconds, or if your multimeter shows a microamp signal below the manufacturer’s threshold (typically 1.0 µA), the sensor likely needs replacement.
• Can I clean this sensor with sandpaper? While cleaning may provide a temporary fix, 120-grit emery cloth is preferred over sandpaper to avoid leaving silica residue. However, once the rod’s surface is pitted, a full OEM replacement is the only way to ensure operational reliability.
• What models does the 100330200 fit? It is an exact-fit replacement for many Lochinvar and A.O. Smith commercial units, including various BTH and KBX series equipment.

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.