Lennox 23G38 L180F-40F Auto Reset Furnace Limit Switch

Description

Lennox 23G38 L180F-40F Auto Reset Furnace Limit Switch

The Lennox 23G38 is a direct OEM replacement auto reset limit switch designed to protect Lennox furnaces from overheating. Identified by model designation L180F-40F, this limit switch opens the circuit at 180°F and automatically resets once the temperature drops by 40°F — restoring normal operation at approximately 140°F — without requiring manual intervention. Keeping this critical safety component in proper working order ensures reliable furnace performance and protects heat exchangers, blower assemblies, and other internal components from thermal damage.

Key Features

• OEM Lennox replacement part — direct fit for compatible Lennox furnace models
• Auto reset operation — automatically restores circuit once safe temperature is reached
• Opens (trips) at 180°F to interrupt operation during overheating conditions
• 40°F differential — resets at approximately 140°F for reliable cycle control
• Provides essential overheat protection for heat exchangers and furnace components
• Helps maintain system safety and extend equipment service life

Specifications

• SKU / Part Number: 23G38
• Model: L180F-40F
• Type: Auto Reset Limit Switch
• Open (Trip) Temperature: 180°F
• Differential: 40°F
• Reset Temperature: Approximately 140°F
• Brand: Lennox

Application

The Lennox 23G38 limit switch is intended for use in Lennox furnace systems requiring OEM-specified overheat protection. Always verify compatibility with your specific furnace model number before installation. For best results, installation should be performed by a qualified HVAC technician.