Lennox 49K08 Temp Sensor

The Lennox 49K08 Temp Sensor (also identified as 49K0801) is an OEM-grade duct-mount temperature sensor designed for precision air monitoring in high-performance HVACR systems. Built with a 12-inch stainless steel probe, this sensor facilitates accurate temperature detection within the core airflow of residential and commercial ducts. Its 22-inch pre-stripped leads provide a reliable electrical interface for rapid field replacement and integration with Lennox air handler and rooftop unit (RTU) control boards, ensuring consistent feedback for climate regulation.

This HVAC temperature probe is engineered to withstand high-velocity turbulence and thermal cycling, making it a critical component for maintaining delta T accuracy and system efficiency. As a direct Lennox replacement part, the 49K08 is compatible with a wide range of equipment, including popular Lennox L Series and Landmark models. Utilizing an authentic OEM temperature sensor eliminates the calibration drift often found in aftermarket thermistors, protecting the compressor and furnace components from irregular cycling and ensuring the HVAC control board receives the exact resistance values required for optimal operation.

• Universal Compatibility: Fully interchangeable with Lennox 49K0801 for streamlined inventory management.
• Enhanced Insertion Depth: The 12-inch probe length allows for centralized temp readings in larger ductwork, reducing static air measurement errors.
• Rigid Construction: Stainless steel probe design resists corrosion and mechanical fatigue in demanding industrial HVAC environments.
• Simplified Wiring: Features 22-inch leads with pre-stripped ends for secure terminal block connections.

Is the 49K08 interchangeable with the 49K0801?
Yes, the Lennox 49K08 and 49K0801 are functionally identical and serve as the same manufacturer part number for replacement purposes.

What are the signs of a failing duct temperature sensor?
Technicians typically observe short-cycling, "out of range" error codes on the integrated furnace control, or significant discrepancies between the thermostat reading and actual discharge air temperature.

Does this sensor work for both heating and cooling stages?
Yes, this duct-mount sensor provides continuous thermal feedback to the system controller to manage both DX cooling and gas/electric heating stages effectively.

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.