York S1-025-35363-000 Limit Switch

The York S1-025-35363-000 is an essential safety component engineered for high-limit protection in residential and commercial furnaces. This 300F manual reset limit switch acts as a primary safety mechanism, interrupting the heating cycle when plenum temperatures exceed the factory-set 300-degree threshold. Designed for precise thermal monitoring, this high limit sensor features a standard L300 degree setting with a manual reset function, ensuring the system remains locked out until a technician can diagnose the cause of the overheat condition. Its 1/2-inch disc configuration and flange mount design allow for seamless integration with OEM York replacement parts, maintaining the integrity of the heat exchanger and blower assembly. For HVAC contractors, this furnace high limit switch provides a reliable solution for restoring system safety and meeting UL requirements for high-temperature protection. Proper installation involves checking for restricted airflow or cracked heat exchangers before resetting the device.

• Precise Thermal Cut-out: Calibrated to trigger at exactly 300°F (149°C) to prevent component failure.
• Manual Reset Security: Requires physical intervention to ensure the underlying cause of overheating is addressed.
• OEM Compatibility: Replaces common York, Coleman, and Luxaire limit switches for exact fitment.
• Durable Bimetal Construction: Engineered to withstand repeated thermal cycling in high-demand environments.

What causes a 300F manual reset limit switch to trip?

Tripping is typically caused by restricted airflow, such as a clogged furnace filter, a failing blower motor, or undersized ductwork that prevents heat dissipation.

Can I replace a manual reset switch with an automatic reset limit switch?

No. You must always use the exact reset type specified by the manufacturer. Manual reset switches are required for specific safety protocols to ensure a professional inspection occurs after a high-heat event.

Is the York S1-025-35363-000 compatible with other brands?

Yes, as an OEM part for Johnson Controls brands, it is frequently used in Coleman and Luxaire units, but always verify the temperature rating and mounting depth before installation.

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.