Description
Lennox 83L83 AUTO Limit Switch Overview
The Lennox 83L83 is an automatic-reset limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. Designed as a direct OEM replacement for compatible Lennox equipment, this limit switch monitors supply-air temperatures and interrupts the burner circuit when temperatures exceed the safe operating threshold — then automatically resets once temperatures return to a safe level, minimizing downtime and service calls.
Key Features
- Auto (automatic) reset operation — restores normal function once temperatures normalize
- Operating temperature range: 150°F to 180°F
- Provides reliable high-limit protection against furnace overheating
- Direct OEM replacement for compatible Lennox heating systems
- Helps protect heat exchangers, blower components, and downstream equipment
- Compact design for straightforward installation in existing limit switch locations
How It Works
The limit switch continuously monitors the air temperature within the furnace plenum or heat exchanger area. If the temperature rises above the rated setpoint — caused by restricted airflow, dirty filters, or other fault conditions — the switch opens the circuit to the burner, shutting down heat production. Once the temperature drops back into the safe range, the automatic-reset mechanism closes the circuit and normal operation resumes without manual intervention.
Application
- Compatible with select Lennox gas furnaces and heating systems
- Ideal for residential and light commercial HVAC applications
- Recommended for use as a direct replacement part — always verify compatibility with your specific Lennox model before installation
Specifications
- SKU: 83L83
- Brand: Lennox
- Switch Type: AUTO (Automatic Reset)
- Temperature Range: 150°F – 180°F
- Function: High-limit overheat protection
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