Resideo 32004955-003 Sensor Assembly

For service contractors troubleshooting hydronic heating controls, the Resideo 32004955-003 Sensor Assembly provides the precise thermal feedback required for high-efficiency boiler operation. This electronic temperature sensor is engineered specifically for the L71XX series of electronic Aquastats, including the widely used L7148 models. The 32004955-003 features a standard 3/8-inch by 1-1/4-inch probe diameter, allowing it to seat securely into existing immersion wells to ensure optimal heat transfer. With a 24-inch wire lead length and 18 AWG construction, this assembly offers the necessary reach for clean wire management within the burner cabinet. This part is a direct technical match for the 32004955-003/U, utilizing NTC thermistor technology to deliver accurate resistance-to-temperature data back to the primary controller. Designed to withstand the thermal cycling inherent in industrial and residential combustion environments, this replacement sensor probe ensures consistent high-limit and low-limit switching performance.

Key Benefits

• Broad Compatibility: Direct replacement for all L71XX series controllers, ensuring seamless integration with existing electronic aquastat logic.
• Precision Thermal Sensing: High-accuracy NTC thermistor probe ensures reactive temperature monitoring to prevent short-cycling.
• Integrated Retaining Clip: Features a captive metal retaining clip for a secure, vibration-resistant fit inside the immersion well.
• Simplified Installation: 24-inch leads with factory-crimped quick-connect terminals (3/16-inch and 1/4-inch) for rapid field replacement.
• Standardized Dimensions: The 3/8" x 1-1/4" probe size matches industry-standard wells found in most hydronic boiler applications.

Common Questions

What is the difference between the 32004955-003 and the 32004955-003/U?
Technically, they are identical. The "/U" suffix typically denotes "universal" packaging for the wholesale channel, but the physical specifications and performance parameters are exactly the same.

Can this sensor be used with the older L8148 series electromechanical aquastats?
No. This is an electronic sensor designed specifically for the digital logic of the L71XX series. Mechanical L8148 models utilize a capillary tube and bulb or a different resistance profile.

Will this sensor work if the immersion well is dry?
While it is designed for immersion wells, the application of heat-conductive grease (silicone-based) is highly recommended for dry wells to ensure the sensor responds to temperature changes without lag.

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.