Lennox 75M32 Limit Switch

The Lennox 75M32 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems. This primary limit control features a 155-195F auto limit range, specifically engineered to open the electrical circuit at a 195°F cut-out temperature and automatically reset once the system cools to a 155°F cut-in point. As a direct OEM replacement part, it ensures seamless integration and maintains the intended internal safety parameters of your furnace or air handler.

The 75M32 is identical to 75M3201, offering full cross-reference compatibility for technicians looking to resolve overheating issues or "Limit Switch Open" fault codes. This normally closed (NC) switch is built with high-grade materials to withstand the rigors of high-cycle industrial and residential environments. Accurate calibration of the L195-40F temperature differential is vital for preventing heat exchanger damage and ensuring consistent airflow monitoring. Whether you are performing a routine service or an emergency repair, utilizing a genuine Lennox 75M32 furnace limit switch provides the reliability contractors require for long-term system stability.

• Broad Compatibility: The 75M32 serves as an exact replacement for the 75M3201 and fits numerous Lennox, Armstrong, and Ducane models (e.g., LGA090H, LGA102H).
• Automatic Reset Function: Features an auto-reset mechanism that restores operation once the 155°F threshold is reached, reducing unnecessary manual service calls.
• High-Precision Calibration: Factory-set for a 195°F ceiling to prevent dangerous thermal excursions and protect heat exchanger integrity.
• Durable Infrastructure: Designed for 24V or 120V/150VAC applications with standard quick-connect terminals for rapid installation.

• How do I know if my Lennox 75M32 is bad? If your furnace blower runs constantly but the burners won't ignite, or if you see a diagnostic code for an open limit circuit, the switch may be failed or Tripped. Use a multimeter to check for continuity across the terminals.
• Is the 75M3201 the same as the 75M32? Yes, these part numbers are interchangeable. The 75M32 is the current manufacturer designation for the older 75M3201 limit control.
• Where is this switch typically located? It is usually found on the heat exchanger base plate or in the plenum to monitor the air temperature directly leaving the heating elements.

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.