Engineering specifications confirm this as a 10k Ohm NTC sensor (Negative Temperature Coefficient)

Direct Replacement: Seamlessly replaces part 8554-009

Direct OEM Compatibility: Engineered as the official successor to part number 950931F

eliminating the mounting and wiring complexities associated with universal furnace fan timers

Lennox 50L68 Control Kit 322838-753 Engineering specifications confirm this asThe Lennox 50L68 Control Kit (LB 96030A) is a critical limit switch assembly engineered for high performance thermal regulation in residential gas furnaces. As a primary safety component, this limit control kit monitors heat exchanger temperatures to prevent overheating and potential equipment failure. Designed for seamless integration, it serves as a direct replacement for OEM Lennox furnace parts, ensuring your system remains compliant with original