Lochinvar & A.O. Smith 100110849 Upper Probe

The Lochinvar & A.O. Smith 100110849 Upper Probe is a critical OEM replacement temperature sensor designed for high-recovery commercial gas water heaters. As a direct replacement for part number 9006047205, this NTC thermistor probe provides high-accuracy thermal monitoring to the integrated control board, ensuring precise cycling and preventing overheating. This specific upper tank probe is engineered for heavy-duty applications, including the A.O. Smith BTR and BTRC series, as well as Lochinvar BCG3 65T300 and 100T390 models. A failing probe often results in "No Heat" calls or erratic temperature swings; replacing it with this genuine factory component restores the factory-spec resistance curve required for optimal thermal stacking and energy efficiency. The rugged stainless steel construction is built to withstand the corrosive environment of high-temperature potable water storage, making it a standard inventory item for technicians servicing commercial water heating systems.

• Direct OEM Compatibility: Engineered specifically for A.O. Smith BTR/BTRC and Lochinvar BCG3 commercial units to guarantee signal accuracy.
• Precise Thermal Feedback: Delivers exact resistance data to the controller, maintaining consistent water temperatures and reducing operational stress.
• Rugged Build Quality: Features a durable sensing bulb designed to resist scale buildup and thermal fatigue in high-recovery heating applications.
• Simplified Field Replacement: Standardized threading and connector types allow for rapid installation, reducing downtime on critical commercial jobs.

What are the symptoms of a faulty 100110849 upper probe?
Common indicators include the control board displaying out-of-range temperature errors, the unit failing to trigger the burner despite a high demand, or the water temperature exceeding setpoints due to inaccurate sensor feedback.

Is this part interchangeable with the lower probe?
While they share similar technology, the 100110849 is specifically calibrated and positioned as the upper probe. For a full system overhaul, it is often recommended to inspect the lower probe (100110850) simultaneously to ensure balanced differential readings.

Can this probe be used in residential water heaters?
This component is technically specified for commercial tank-type water heaters like the BTR series. Always verify the part number against your unit's rating plate or the manufacturer's illustrated parts list before installation.

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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.