Lennox 23G38 Limit Switch

As a core safety component for critical heating applications, the Lennox 23G38 Limit Switch provides essential thermal protection by monitoring the internal temperature of the heat exchanger. This OEM Lennox part is a fixed-temperature L180F-40F auto limit switch, engineered to open the electrical circuit at 180°F and automatically reset when the temperature drops to 140°F. This high-limit safety control prevents equipment damage and potential fire hazards by shutting off the burner or heating elements when unsafe operating conditions are detected. Designed for heavy-duty HVAC 23G38 replacements, this disc-style limit control features a normally closed circuit and a surface-mount configuration for streamlined installation. It is a direct fit for various Lennox, Armstrong, and Ducane packaged units and furnaces, including the GCS16 and GCS24 series. Reliable HVAC temperature regulation is vital for maintaining system efficiency and preventing frequent short-cycling or blower motor malfunctions.

• Precise Thermal Protection: Engineered for accurate 180°F cutout to safeguard the heat exchanger from overheating.
• Automatic Reset Functionality: Closes the circuit once the unit cools to 140°F, restoring normal operation without manual intervention.
• Extensive Compatibility: Replaces multiple legacy part numbers including 23G3801, 203407-001, and T-O-D 60T13.
• OEM Standards: Built to original equipment manufacturer specifications for exact mounting and electrical performance in Lennox units.

• What does the L180F-40F rating indicate? This indicates the switch opens at 180 degrees Fahrenheit (F) and closes at 140 degrees Fahrenheit (the 40F difference being the fan or reset differential).
• Will this fix a furnace that starts and then stops immediately? Yes, a faulty limit switch is a common cause of furnace short-cycling and should be tested if the heat exchanger is not genuinely overheating.
• Is this switch compatible with other brands? This 23G38 limit control also cross-references with Allied, Armstrong, Concord, and Ducane heating equipment.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.