York S1-025-26366-008 Limit Switch

The York S1-025-26366-008 Limit Switch is a critical safety component designed for high-limit protection in residential furnaces and air handlers. This automatic reset furnace switch is calibrated to open the electrical circuit if the heat exchanger temperature exceeds the 170°F threshold and will automatically close once the temperature cools to 110°F. For technicians troubleshooting a lockout, this York replacement part is essential for maintaining the manufacturer's sequence of operation. This snap-disc style sensor is engineered for precision, preventing thermal stress on the heat exchanger caused by restricted airflow or blower motor failure. As a genuine OEM furnace limit switch, it ensures compatibility with specific York, Coleman, and Luxaire platforms without the need for field modifications. Incorporating this HVAC high limit control into your repair ensures the system operates within its rated heat rise specifications. The durable construction is designed to withstand the rigorous thermal cycling common in modern high-efficiency gas furnaces.

Key Benefits

• Automatic Reset Logic: Restores the heating cycle automatically once internal temperatures return to safe operating levels without requiring a manual reset.
• Precise Thermal Calibration: Factory-set for a 110-170F temperature range to ensure tight adherence to system safety parameters.
• OEM Direct Fit: Designed specifically as a drop-in replacement for York S1-025-26366-008, ensuring proper terminal orientation and mounting alignment.
• Safety Integrity: Prevents catastrophic heat exchanger failure by monitoring air temperature at the most critical point in the plenum.

Common Questions

How do I diagnose a faulty York limit switch?
Using a multimeter, check for continuity across the terminals when the system is cool. If you see an open circuit before the furnace has even fired, the switch is likely stuck open and requires replacement.

What causes this limit switch to trip frequently?
Frequent tripping is usually a symptom of airflow issues, such as a dirty 1-inch pleated filter, an undersized return air duct, or a failing indoor blower motor. Always check the temperature rise across the heat exchanger after installation.

Can I use this switch in a different brand of furnace?
While many switches look similar, you must match the specific temperature ratings and mounting depth. This 110-170F switch should only be used in applications where the original part number matches the S1-025-26366-008 specifications.

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.