Lennox 69W38 Control-Limit (AUX) 135°F is an OEM temperature safety limit switch designed to protect Lennox gas furnaces and air handlers from overheating conditions. This automatic reset control-limit opens the circuit when the internal temperature reaches approximately 135°F, preventing damage to critical components and ensuring safe system operation. Once the temperature drops back to a safe range, the switch automatically resets, allowing normal heating operation to resume.

This auxiliary control-limit switch is commonly installed in the furnace plenum or heat exchanger area and plays a critical role in safeguarding the blower and heat circuits. Lennox 69W38 is a direct replacement for part number 69M3801 and is manufactured to meet Lennox OEM performance and reliability standards. It is compatible with select Lennox, Armstrong, Ducane, Allied, and Concord furnace models where a 135°F auxiliary limit control is specified.

Ideal for professional HVAC service and furnace repairs, this genuine Lennox limit switch ensures accurate temperature response, long service life, and proper system protection. Using OEM parts like the Lennox 69W38 helps maintain equipment safety, efficiency, and manufacturer specifications.

 

Specifications:

Manufacturer: Lennox
Part Number: 69W38
Alternate / Replacement Part Number: 69M3801
Type: Control-Limit Switch (AUX)
Temperature Rating: Opens at approximately 135°F
Reset Type: Automatic
Application: Furnace and air handler safety control
Function: Overheat protection for auxiliary circuits
OEM: Yes