Lochinvar & A.O. Smith 100208562 Outlet Sensor

Maintain the operational integrity of high-efficiency hydronic systems with the Lochinvar & A.O. Smith 100208562 Outlet Sensor. This critical OEM replacement part is a 1/4" NPT outlet thermistor designed to provide precision temperature data to the Smart System control module. Engineered for Lochinvar Knight boilers and A.O. Smith Cyclone water heaters, this sensor monitors discharge water temperatures to prevent manual reset high limit (MRHL) lockouts and "Temp Diff" fault codes. By delivering real-time thermal feedback, the 100208562 sensor allows for optimized modulation of the gas valve and blower, directly improving fuel efficiency and combustion performance. The genuine Lochinvar sensor features a durable probe assembly resistant to mineral buildup and thermal cycling, ensuring reliable service in demanding commercial and residential HVACR applications. Replacing a drifted or short-circuited sensor is a standard procedure to restore accurate DHW tank set point maintenance and safe system sequencing.

• Direct OEM Replacement: Ensures 100% compatibility with Lochinvar Knight and A.O. Smith Cyclone series without the need for harness modifications.
• System Protection: Prevents nuisance high-limit trips and temperature stratification issues by providing accurate water temperature monitoring at the heat exchanger outlet.
• Enhanced Efficiency: Enables the control board to fine-tune modulation rates, reducing short-cycling and increasing overall thermal efficiency.
• Robust Construction: The 1/4" NPT threaded sensor is designed for immersion in high-velocity water streams, offering superior response times compared to surface-mount thermistors.

• How do I test a failing 100208562 sensor? Technicians should disconnect the leads and measure resistance (k?) across the terminals, comparing the value to the resistance-to-temperature chart in the service manual.
• Will this fix a 'Temp Diff' error on a Knight boiler? Yes, if the error is caused by a drifted outlet sensor failing to match the return or supply sensor readings within the control module's tolerance.
• What size thread does this sensor use? This part uses a standard 1/4" NPT connection, common in Lochinvar and A.O. Smith manifold and outlet header designs.

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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.