York S1-025-26390-001 Limit Switch

The York S1-025-26390-001 limit switch is a critical safety component designed for precise thermal regulation within residential gas furnaces. This HVAC high limit switch features an automatic reset mechanism and is calibrated to operate within a specific 210-260 F temperature range. When diagnosing a furnace overheating fix, technicians often identify this part as the primary failsafe that interrupts power to the gas valve when plenum temperatures exceed safe operating parameters. As one of the most essential York replacement parts, the S1-025-26390-001 specs ensure it integrates seamlessly with existing control boards to prevent heat exchanger fatigue. Using this OEM component maintains the original engineering profile of York, Luxaire, and Coleman units. Professional installation is recommended to verify that the York furnace limit switch replacement resolves the underlying cause of the thermal trip, such as high static pressure, a clogged filter, or inadequate secondary heat exchanger airflow, ensuring long-term system reliability and safety during peak heating cycles.

• Direct OEM replacement for York, Luxaire, and Coleman heating equipment.
• Automatic reset functionality eliminates the need for manual intervention once temperatures normalize.
• Factory-calibrated 210-260 F trip window for precise thermal protection.
• Durable bimetal disc construction ensures consistent performance under high thermal stress.

Why is my York furnace limit switch tripping?

A tripped switch usually indicates restricted airflow caused by dirty filters, a failing blower motor, or an oversized furnace. It acts as a safety lockout to prevent the heat exchanger from cracking due to excessive heat.

How do you test the S1-025-26390-001?

Technicians should measure continuity across the terminals at room temperature. The switch is a normally closed (NC) component; if it displays an open circuit while cool, the internal bimetal plate has likely failed and requires replacement.

Where is this limit switch typically located?

The S1-025-26390-001 is usually mounted on the divider plate or the furnace firewall, where the sensor can directly monitor the air temperature surrounding the heat exchanger cells.

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.