Reznor 123973 Auto Fan Limit Switch 105-160F

The Reznor 123973 is an automatic fan limit switch designed for Reznor unit heaters and furnaces. This essential safety control regulates fan operation and prevents overheating by monitoring temperature ranges between 105°F and 160°F.

Key Features:

• Temperature range: 105-160°F for optimal safety control
• Automatic fan control ensures efficient heating operation
• Safety limit function prevents unsafe temperature levels
• Complete control assembly includes mounting plate (148081) and all controls
• Direct OEM replacement part for Reznor heating equipment
• Also known by Reznor part number 135156

This fan and limit control assembly is designed to automatically activate the blower fan when the heat exchanger reaches the appropriate temperature and shut it off when the temperature drops. The high-limit function acts as a critical safety device that will shut down the burner if internal temperatures exceed safe operating levels, protecting both the equipment and the building.