Lennox 83L86 Auto Reset Limit Switch

The Lennox 83L86 is an OEM automatic reset limit switch designed for residential gas furnaces. This safety control is engineered to protect your heating system from overheating by monitoring heat exchanger temperatures and shutting down the burner when necessary.

Key Features:

• Normally closed SPST (Single-Pole Single-Throw) configuration
• Opens on temperature rise at 205°F to prevent overheating
• Automatically resets and closes on temperature drop at 175°F
• 3-inch insert length for proper heat exchanger sensing
• Factory-direct OEM replacement part ensures reliable performance

This limit control switch is compatible with various Lennox gas furnace models and replaces part number 83L8601. It also cross-references to Allied, Armstrong, Concord, and Ducane equipment under the same part number. The automatic reset feature eliminates the need for manual intervention once the furnace cools to a safe operating temperature.