York S1-025-29093-002 Limit Switch

The York S1-025-29093-002 Limit Switch is a critical safety component designed for high-limit temperature monitoring in residential and commercial forced-air furnaces. Engineered for precise thermal regulation, this 120-150F AUTO Limit Switch features a fixed set point that opens the circuit when temperatures exceed 150°F and automatically resets once the exchanger cools to 120°F. As an OEM York furnace replacement part, it ensures direct compatibility with Johnson Controls and Source 1 systems, maintaining the integrity of the 24V control loop. Proper installation of this L150-30F thermal limit is essential for preventing heat exchanger fatigue and ensuring the blower assembly operates within safe parameters. Technicians should verify static pressure and airflow across the coil when troubleshooting frequent trips, as this switch is a primary defense against restricted ductwork or failed blower motors. Integrating a genuine S1-025-29093-002 switch maintains the UL listing and safety certifications of the original equipment.

• Automatic Reset Function: Re-engages at 120°F to resume normal heating cycles without manual intervention.
• High-Temperature Protection: Triggers at 150°F to prevent furnace overheating and potential cracking of the heat exchanger.
• OEM Precision: Direct Source 1 service part ensures correct terminal spacing and mounting alignment for rapid field replacement.
• Electrical Integrity: Rated for low-voltage control circuits typical in many York, Coleman, and Luxaire gas furnaces.

What causes a York high limit switch to trip repeatedly?
Frequent tripping is usually indicative of restricted airflow, often caused by a dirty air filter, undersized ductwork, or a failing indoor blower motor. If the switch remains open, it likely requires replacement after several high-heat cycles have weakened the bimetal strip.

How do I test the S1-025-29093-002 for continuity?
With power disconnected and the switch cooled below 120°F, use a multimeter on the ohms setting. You should see a reading of near zero ohms (closed circuit). An infinite reading (OL) at room temperature indicates a failed switch.

Can this switch be used in place of a manual reset limit?
No. Safety protocols require using the exact specified reset type. An automatic reset limit switch must only be used where the original engineering specifications call for an L150-30F auto-reset component.

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.