York S1-025-35381-000 Limit Switch

The York S1-025-35381-000 Limit Switch is a critical HVAC safety control designed to monitor internal plenum temperatures and protect the heat exchanger from thermal stress. As a high-limit auto-reset switch, this component features a precise 145°F opening temperature to interrupt the burner circuit upon detecting an overheat condition. Once the system cools to the 115°F closing temperature, the switch automatically resets, allowing for the restoration of the heating cycle without manual intervention. This OEM York replacement part is engineered for direct compatibility with York, Coleman, and Luxaire gas furnaces, ensuring the system maintains proper airflow regulation and equipment longevity. Veteran technicians prioritize this thermal protection switch to resolve furnace short cycling and prevent dangerous high-temperature excursions. Its robust, sealed construction is built to withstand the rigorous duty cycles found in residential and light commercial rooftop units.

Key Benefits

• Precision Thermal Monitoring: Provides reliable circuit interruption at 145°F to safeguard the furnace heat exchanger from structural damage caused by excessive heat.
• Automatic System Recovery: The auto-reset functionality at 115°F eliminates the need for manual service resets after a standard high-limit trip.
• Direct OEM Compatibility: Specifically designed to replace York S1-025-35381-000, maintaining original equipment specifications for safety and performance.
• Durable HVAC Construction: Features a moisture-resistant housing and high-grade internal contacts for consistent furnace limit control in high-static environments.

Common Questions

What causes a York furnace limit switch to trip frequently?
Repeated tripping is usually a symptom of restricted airflow, often caused by a dirty air filter, blocked supply registers, or a failing blower motor that cannot dissipate heat from the exchanger effectively.

How can I verify if my S1-025-35381-000 is faulty?
A veteran tech will check for electrical continuity across the terminals while the system is cool. If the circuit remains open at room temperature, the switch has failed and requires immediate replacement.

Is this limit switch compatible with other brands?
Yes, this OEM part is the standard replacement for various Source 1 applications within the Johnson Controls family, including many Coleman and Luxaire furnace models.

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.