The Lennox 39L06 is an OEM replacement limit switch engineered for use in Lennox heating systems. Limit switches are a critical safety component in furnaces and air handlers, designed to monitor operating temperatures and shut down the burner or heating element if the system exceeds safe temperature thresholds — preventing equipment damage, heat exchanger failure, and potential fire hazards.
Product Overview
This direct OEM replacement ensures proper fit, function, and reliability in compatible Lennox equipment. Installing the correct limit switch helps maintain system efficiency, protects heat exchangers from thermal stress, and keeps your equipment operating within safe parameters.
Key Features
- OEM replacement limit switch for Lennox heating systems
- Monitors system temperature to prevent overheating
- Automatically interrupts the heating circuit when safe temperature limits are exceeded
- Direct drop-in replacement for simplified installation
- Helps protect heat exchangers and other critical components from thermal damage
- Supports safe, reliable furnace and air handler operation
Application
- Compatible with select Lennox furnaces and heating systems
- Ideal for service technicians performing maintenance or safety component replacement
Why Choose the Lennox 39L06?
Using a genuine OEM-specified limit switch ensures your Lennox system operates as designed. Third-party substitutes may not meet the exact temperature ratings or form factor required, potentially compromising system safety and warranty compliance. The Lennox 39L06 delivers the precise performance your equipment demands.








