York S1-025-27747-012 Rollout Switch

The York S1-025-27747-012 Rollout Switch is a critical safety component designed for York gas furnaces and Johnson Controls HVAC systems. Engineered to respond to flame rollout or unsafe combustion conditions, this manual reset limit switch triggers at a fixed thermal threshold of 260 degrees Fahrenheit. As a Single-Pole Single-Throw (SPST) control, it serves as the primary circuit interrupt for the gas valve when it detects temperatures exceeding safe operating parameters near the burner head. This OEM replacement part is built for direct compatibility with York rooftop units and residential furnaces, ensuring field reliability without the common failures associated with generic substitutes. Its compact, flame-rated housing and standard spade terminal connectors facilitate efficient drop-in installation during emergency service calls. When diagnosing a tripped circuit, technicians should inspect the heat exchanger, inducer motor performance, and exhaust venting to address the root cause of the high-limit trip before manually resetting the device.

• Precision Thermal Trip: Factory-calibrated to 260 degrees F to provide immediate protection against internal cabinet overheating.
• Manual Safety Lockout: Features a manual reset button that requires technician inspection of the combustion system after a fault, preventing dangerous automated restarts.
• Genuine OEM Build: Specifically engineered for York S1-025-27747-012 specifications, ensuring exact mounting alignment and electrical continuity.
• Fail-Safe Logic: The SPST configuration provides a reliable, normally closed circuit that breaks cleanly upon activation.

• Why is my York furnace rollout switch tripping? Trips are typically caused by restricted airflow, cracked heat exchangers, or back-drafting due to blocked vents or failed induction.
• Can I bypass this switch for testing? Never bypass safety controls. Bypassing a rollout switch can lead to fire or system damage; use a multimeter to check for continuity instead.
• How do I reset the S1-025-27747-012? Once the unit is cooled, press the small center button between the terminals until it clicks. If it trips immediately after, professional diagnostics are required.

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.