Description
Lennox 46K07 L185-20F Furnace High-Limit Switch Overview
The Lennox 46K07 is an OEM replacement high-limit switch designed to protect furnaces from dangerous overheating conditions. Carrying the model designation L185-20F, this limit switch is engineered to open the control circuit at 185°F and automatically reset once temperatures drop by 20°F — closing again at approximately 165°F. This precise thermal response helps safeguard heat exchangers, blower assemblies, and connected components from heat-related damage.
How It Works
The high-limit switch continuously monitors supply-air or heat exchanger temperatures within the furnace. When temperatures exceed the rated set point of 185°F — due to restricted airflow, a dirty filter, or a blower malfunction — the switch opens and interrupts the burner circuit, shutting down heating operation. Once the furnace cools to within the differential range, the switch automatically resets, restoring normal operation.
Key Features
- OEM Lennox replacement part — ensures proper fit and reliable performance
- Opens (trips) at 185°F to prevent furnace overheating
- 20°F differential — automatically resets at approximately 165°F
- Protects heat exchangers, blowers, and internal components from thermal damage
- Direct drop-in replacement for compatible Lennox furnace models
- Durable construction for long service life in residential and light commercial applications
Application
The Lennox 46K07 L185-20F Limit Switch is intended for use in Lennox furnaces requiring a high-limit safety control. Always verify compatibility with your specific furnace model before installation. Consult the furnace service manual or Lennox technical documentation to confirm the correct limit switch rating for your application.
Specifications
- Brand: Lennox
- Part Number / SKU: 46K07
- Model: L185-20F
- Type: High-Limit Switch
- Open (Trip) Temperature: 185°F
- Differential: 20°F
- Reset Temperature: ~165°F
- Reset Type: Automatic
