Lochinvar & A.O. Smith 100110850 Lower Probe

The Lochinvar & A.O. Smith 100110850 Lower Probe is a precision-engineered OEM replacement part designed for high-performance commercial and residential water heating systems. As a critical immersion temperature sensor, this lower probe provides the control board with real-time thermal data to regulate firing rates and maintain accurate setpoints. Built for high-duty cycle environments, the 100110850 probe (also identified by part number 9006048205) is a direct replacement for failed or scaled sensors in Lochinvar Knight and A.O. Smith BTR series units. Its robust construction ensures long-term resistance to mineral buildup and thermal fatigue, preventing common "no hot water" service calls caused by inaccurate resistance readings. For technicians performing water heater troubleshooting, replacing a drifted or open-circuit sensor with this genuine Lochinvar temperature probe is essential for restoring system efficiency and ensuring the high-limit safety circuits function according to factory specifications. This lower thermistor probe is verified for compatibility with a wide range of natural gas and LP models, providing the specific NTC resistance curve required for precise modulation.

• Precise Thermal Monitoring: Delivers accurate resistance signals to the water heater control board for optimal combustion and temperature stability.
• OEM Compatibility: Exact 9006048205 replacement ensures seamless mechanical fitment and electrical calibration without field modifications.
• Enhanced System Reliability: Specifically designed to withstand the harsh internal conditions of commercial water heater tanks, reducing sensor failure rates.
• Direct Fit Design: Simplifies the installation process for HVAC contractors, ensuring a leak-proof seal and immediate system normalization.

• Can this probe be used in the upper and lower positions? This specific model is calibrated and sized as a lower probe; always verify your unit's service manual to ensure the immersion depth matches the tank's requirements.
• How do I know if the 100110850 is faulty? Technicians should check for error codes related to sensor shorts or opens and verify the resistance (ohms) against the manufacturer’s temperature chart.
• Is this part compatible with non-A.O. Smith brands? While widely used in Lochinvar and State Industries equipment, always cross-reference the OEM part number to ensure the thermistor curve is compatible with the controller.

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.