Lochinvar & A.O. Smith 100110731 Sensor Assembly

When you're troubleshooting erratic temperature readings or ignition lockout codes on Lochinvar Knight or A.O. Smith residential gas water heaters, the Lochinvar & A.O. Smith 100110731 Sensor Assembly is often the critical point of failure. This OEM water heater temperature sensor is engineered as a high-precision resistance-type device, specifically designed to provide the control board with real-time thermal data required for internal modulation and high-limit safety protocols. Unlike generic thermistors, this 100110731 replacement part features the exact NTC (Negative Temperature Coefficient) curve necessary to maintain tight differential control, preventing short-cycling and ensuring the exhaust limit or tank temperature remains within factory parameters.

Built for the rigors of high-efficiency hydronic environments, this genuine temperature sensor assembly includes the encapsulated sensor probe and the correct harness connector to ensure a plug-and-play fit without field modifications. Whether you are performing an annual teardown or responding to a "No Hot Water" call, choosing OEM heating and cooling parts like this assembly ensures the HVAC replacement sensor maintains the original equipment’s UL listing and operational integrity. It is verified for use in a wide range of Lochinvar and A.O. Smith commercial and residential platforms, delivering the thermal accuracy a veteran tech expects for a long-term fix.

Key Benefits

• Direct OEM Match: Drops into place with the correct thermal response curve to eliminate nuisance fault codes.
• High-Precision Monitoring: Prevents system overheating by delivering accurate resistance values to the integrated control board.
• Industrial Build Quality: High-grade leads and specialized potting protect the internal thermistor from moisture and thermal fatigue.
• Broad Compatibility: Engineered for A.O. Smith and Lochinvar technical platforms, including several high-efficiency boiler and water heater series.

Common Questions

Does this assembly include the wiring harness?
Yes, the 100110731 comes with the attached lead wires and the specialized clip-style connector for a secure interface with the main control module.

Can I use an ohmmeter to test this sensor?
Technicians should test the resistance across the pins and compare it to the manufacturer’s temperature vs. resistance chart (typically 10k ohms at 77°F) to confirm if the sensor has drifted out of calibration.

Will this work for both inlet and outlet temperature applications?
While often used for tank or outlet monitoring, compatibility depends on your specific model’s wiring schematic. Always verify the part number against your unit’s build sheet.

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.