Description
Lennox 18H01 L140-40F Furnace High Limit Switch Overview
The Lennox 18H01 is a genuine OEM L140-40F high limit switch engineered to protect your furnace from dangerous overheating conditions. When supply-air temperatures exceed the rated setpoint, this safety control interrupts the burner circuit to prevent heat exchanger damage, equipment failure, and potential fire hazards — then automatically resets once temperatures return to a safe operating range.
Key Specifications
- Part Number: 18H01
- Limit Switch Model: L140-40F
- Open (Trip) Temperature: 140°F
- Differential: 40°F
- Reset Temperature: 100°F (automatic reset)
- OEM Lennox replacement part
- Designed for use in Lennox furnace applications
Features & Benefits
- Genuine Lennox OEM quality ensures proper fit and reliable performance
- Automatic reset operation restores normal furnace function once safe temperatures are reached
- Protects heat exchanger and burner components from thermal damage
- Direct drop-in replacement for compatible Lennox furnace models
- Helps maintain system safety and extend equipment service life
Application
This limit switch is a critical safety component in Lennox forced-air furnaces. It monitors supply-air or heat exchanger temperatures and shuts down the burner if an overheat condition is detected. Always verify compatibility with your specific Lennox furnace model before installation.
Reviews
There are no reviews yet.