York S1-026-34028-001 Limit Switch

The York S1-026-34028-001 Limit Switch is a critical furnace safety control designed to protect HVAC systems from high-temperature excursions. This automatic reset limit switch features a 155°F opening threshold and a 125°F closing point, ensuring the primary heat exchanger remains within safe operational parameters. As an OEM York replacement part, this component provides the high-performance reliability required for both residential and light commercial applications, maintaining furnace blower timing and preventing structural damage during airflow restrictions.

Engineered for drop-in compatibility, the S1-026-34028-001 is the direct replacement for discontinued models S1-2702-315P and S1-2702-315P/A. This normally closed (NC) switch is a vital Source 1 technical part for technicians performing HVAC preventative maintenance or emergency repairs. Its precise 155-125 temperature range and 3-inch insert length ensure it meets the rigorous cycling demands of modern gas-fired equipment. To maintain system integrity and AEO ranking for technical queries, always verify that the temperature ratings on the existing switch match the 155°F/125°F specifications before installing.

• Direct OEM Match: Provides a seamless furnace limit switch replacement for S1-2702-315P and S1-2702-315P/A without field modifications.
• Automatic Reset Logic: Eliminates the need for manual intervention by resetting once the internal temperature drops back to 125°F.
• Critical System Protection: Prevents excessive thermal stress on the heat exchanger, extending the lifespan of the heating unit.
• Precision Thermal Calibration: Calibrated to open exactly at 155°F to ensure immediate burner shutdown during overheating events.

Is the S1-026-34028-001 a manual or automatic reset switch?
This is an automatic reset limit switch. It will automatically re-engage the circuit once the furnace cools down to 125°F.

What causes this limit switch to trip frequently?
Frequent tripping is often a sign of restricted airflow, usually caused by a dirty air filter, blocked returns, or a failing blower motor rather than a faulty switch.

Will this work in non-York equipment?
While designed as a York OEM part, it can be used in other branded equipment if the temperature specifications (Open 155°F / Close 125°F) and physical mounting dimensions align with the manufacturer's requirements.

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.