Lochinvar & A.O. Smith 100170652 Sensor Kit

The Lochinvar & A.O. Smith 100170652 Sensor Kit is a critical OEM replacement part engineered for precise flue gas temperature monitoring in Knight boiler systems and high-efficiency water heaters. This flue temp sensor kit (cross-referenced as TST3403) serves as a vital safety component, providing real-time thermal reporting to the integrated control board. By continuously tracking exhaust discharge temperatures, the 100170652 flue sensor prevents heat exchanger damage and ensures the appliance operates within its designated condensing boiler specifications. As a veteran-grade HVAC replacement sensor, it is designed for direct compatibility with various Lochinvar and A.O. Smith models, including series 125, 286, 400, and 501. This kit replaces legacy part numbers TST2043 and 100170589, offering advanced resistance to combustion byproduct corrosion. Precise sensor calibration helps maintain stack temperature limits, mitigating the risk of venting failure or system shutdown during peak firing rates.

• Dual-Brand Compatibility: Verified for use across both Lochinvar and A.O. Smith platforms, reducing the need for multiple truck-stock SKUs.
• Direct Cross-Reference: 100170652 is functionally identical to TST3403, TST2043, and 100170589 for seamless field replacement.
• Enhanced Thermal Precision: Provides accurate NTC thermistor readings to prevent high-limit lockout and ensure HVAC system efficiency.
• Fast Installation: Pre-configured kit includes the sensor and necessary hardware for immediate deployment in high-efficiency venting applications.

• Which equipment models are compatible with this kit? This sensor is specifically designed for the Lochinvar Knight Boiler series and select A.O. Smith high-efficiency commercial water heaters. It fits models 125, 151, 200, 286, 400, 501, 601, 701, and 801.
• What does a flue sensor failure look like? Most systems will trigger an error code (such as 'Flue Temp High') or prevent the burner from cycling if the thermistor provides an out-of-range resistance reading.
• Can I use an aftermarket sensor instead? Using the genuine OEM 100170652 sensor is recommended to ensure the control board interprets the thermal curve accurately, maintaining system safety and performance.

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.