Description
The Lennox 83L91 is an OEM automatic-reset limit switch engineered to protect Lennox heating systems from dangerous overheating conditions. Designed to open the circuit when temperatures rise to the upper threshold and automatically restore operation once safe temperatures are reached, this limit switch is a critical safety component in residential and light commercial furnace applications.
Key Features
- Auto-reset operation — automatically resets once temperature returns to safe range
- Temperature range: 185°F cut-out / 215°F upper limit
- OEM Lennox replacement part for precise fit and reliable performance
- Protects heat exchangers and furnace components from thermal damage
- Direct replacement for compatible Lennox furnace models
How It Works
The limit switch continuously monitors the air temperature within the furnace plenum or heat exchanger area. If temperatures exceed the rated cut-out threshold, the switch opens the control circuit, shutting down the burner to prevent overheating. Once temperatures drop back into the safe operating range, the auto-reset mechanism restores normal furnace operation without requiring manual intervention.
Application
- Lennox residential and light commercial gas furnaces
- Replacement of failed or out-of-spec OEM limit switches
- Routine preventive maintenance and safety inspections
Why Choose OEM?
Using a genuine Lennox OEM limit switch ensures compatibility with your system’s control board, correct temperature calibration, and long-term reliability — keeping your equipment running safely and efficiently season after season.
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