Description
Lennox 10M79 L140-40F Furnace Limit Switch
The Lennox 10M79 is an OEM replacement L140-40F limit switch engineered to protect Lennox furnaces from overheating. As a critical safety component, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed safe operating thresholds — helping prevent equipment damage, heat exchanger failure, and potential fire hazards.
Key Features
- OEM Lennox replacement part — ensures precise fit and reliable performance
- L140-40F designation indicates a 140°F open / 40°F differential limit switch
- Automatically shuts off burner when temperature exceeds safe limit
- Resets automatically once the heat exchanger cools to a safe operating temperature
- Designed for use in Lennox gas furnaces requiring the L140-40F specification
- Helps protect heat exchangers, blower components, and downstream ductwork
Application
- Direct OEM replacement for Lennox furnace models specifying part number 10M79
- Suitable for residential and light commercial Lennox heating systems
Why Choose an OEM Lennox Limit Switch?
Using a genuine Lennox OEM limit switch ensures the correct temperature rating, differential, and electrical specifications are maintained. Aftermarket substitutes may not meet the exact calibration required for safe and efficient furnace operation. The 10M79 is the correct factory-specified replacement, giving technicians confidence in every installation.
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