York S1-7624A3591 Limit Switch

The York S1-7624A3591 Limit Switch is a high-precision, manual reset upper limit safety control engineered for gas-fired heating systems. Designed to open at a fixed lockout temperature of 180°F, this L180 manual reset switch serves as a critical fail-safe, cutting power to the burner circuit to prevent heat exchanger damage or flame rollout in the event of a blower failure or restricted airflow. As a genuine furnace limit switch replacement, it restores the original safety specifications of the unit, ensuring the system cannot automatically restart until a technician manually clears the fault. This HVAC high limit control is built for heavy-duty cycling and provides the reliable response times necessary for York, Coleman, and Luxaire residential and commercial furnaces. Utilizing the exact S1-7624A3591 OEM part maintains system UL/CSA certifications and ensures a drop-in fit with standard spade terminal connections for fast field installation.

• Critical Overheat Protection: Specifically calibrated to trigger at 180°F, preventing thermal stress and potential fire hazards.
• Manual Reset Security: Features a manual reset (M/R) button, forcing a manual inspection of the furnace before the system can resume operation.
• OEM Compatibility: Guaranteed fit for York S1-7624A3591 applications, eliminating the calibration drift common with generic universal switches.
• Professional-Grade Durability: Constructed with high-temperature phenolics and robust contacts to handle inductive loads in 24V control circuits.
• Versatile Application: Primarily used as an upper limit switch in gas furnaces, also compatible with select heat pump and air handler configurations.

What causes this limit switch to trip?
A trip is typically caused by restricted airflow, such as a clogged 4-inch pleated filter, a failing blower motor capacitor, or blocked return air grilles. If the internal plenum temperature reaches 180°F, the manual reset limit will open.

Is the S1-7624A3591 universal for all York furnaces?
While used across many York and Coleman models, you must verify the temperature rating (L180) on your existing part. Installing a switch with a different set point can lead to premature tripping or unsafe operating conditions.

How do I reset a manual limit switch?
This switch stays open until the red button on the back is physically depressed. It is recommended to diagnose the airflow issue before resetting to prevent recurring safety lockouts.

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.