York S1-025-21180-000 Limit Switch

The York S1-025-21180-000 Limit Switch is a critical safety component engineered for precise temperature monitoring in residential and commercial HVAC systems. This 125-165F automatic limit switch features a SPST configuration designed to open at 165°F and automatically reset when the temperature drops to 125°F. As an authentic HVAC OEM replacement part, it ensures seamless compatibility with York, Luxaire, and Coleman furnace models, maintaining high-limit protection against heat exchanger overheating. For technicians performing furnace limit switch replacement, this component provides the specified thermal response required to protect the blower motor and inducer assembly. Its robust construction and automatic reset furnace switch logic eliminate the need for manual intervention after a temporary thermal event, ensuring consistent York furnace temperature control. Integrating the S1-025-21180-000 into your maintenance routine helps prevent system lockout and maintains OEM-standard safety protocols across various air handling units.

Key Benefits:

• System Protection: Provides essential high-limit detection to prevent heat exchanger damage and hazardous operating conditions.
• Automatic Reset: Resumes normal operation automatically at 125°F, reducing service callbacks for simple thermal trips.
• Direct OEM Fit: Guaranteed mechanical and electrical compatibility with York, Coleman, and Luxaire gas furnaces.
• Precision Calibration: Factory-set trip points at 165°F ensure accurate safety cycling according to equipment specifications.

Common Questions:

What are the symptoms of a failing York furnace limit switch?
A faulty switch often causes the furnace blower to run continuously or results in short-cycling, where the burner shuts off prematurely before the thermostat is satisfied.

Is the S1-025-21180-000 a manual or automatic reset switch?
This model is an automatic reset limit switch. It will re-close the circuit once the internal temperature falls below the 125°F threshold, unlike manual switches that require a physical reset button press.

Can I use this limit switch in other furnace brands?
While designed primarily for York-family equipment (including Coleman and Luxaire), it may be cross-referenced with other units requiring a 125/165-degree range; however, verifying the mounting footprint and terminal orientation is recommended for a secure fit.

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.