Lochinvar & A.O. Smith 100208639 Sensor

As a seasoned technician, you know that keeping a Lochinvar Knight boiler or A.O. Smith water heater running at peak efficiency requires precise data from the 100208639 Sensor. This OEM replacement temperature sensor is critical for monitoring inlet and outlet temperatures, ensuring the control board can accurately modulate the firing rate and maintain the correct delta T across the heat exchanger. When a 100208639 sensor fault occurs, it often triggers a lockout to prevent overheating, making this a high-priority part for any service call. This specific kit features durable black leads and replaces legacy part numbers WRE2416 and WRE2416K, providing full compatibility with SMART SYSTEM control platforms found in modern high-efficiency hydronic systems. This boiler thermistor provides the high-accuracy resistance feedback needed to avoid short-cycling and ensure stable domestic hot water and space heating performance in demanding commercial and residential applications.

• OEM Compatibility: Fully replaces 100208639, WRE2416, and WRE2416K for a seamless fit in Lochinvar and A.O. Smith units.
• Precise Monitoring: Provides accurate NTC thermistor readings to the control module for optimal modulation and system protection.
• Durable Construction: Built to withstand the constant thermal cycling of high-efficiency condensing boilers and commercial heaters.
• Easy Integration: Features standard wiring leads for quick connection to the existing harness, reducing downtime during emergency repairs.

• How do I troubleshoot a 100208639 Sensor fault? Check for a short or open circuit using a multimeter set to the 20K ohm scale. Compare your readings against the manufacturer's temperature-resistance chart.
• Will this sensor fix a "Delta T High" lockout? If the sensor is providing inaccurate data, the board may trigger a lockout. Always verify pump operation and flow before replacing the sensor.
• Is this part interchangeable with the brown-wire version? Yes, the 100208639 is the current manufacturer-recommended replacement for the older WRE2416 and WRE2416K sensors.

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.