York S1-025-27747-002 Temp Control

The York S1-025-27747-002 serves as a high-integrity safety component engineered for precise thermal regulation within furnace and air handler assemblies. This manual reset high limit switch is factory-calibrated to open at 200 degrees Fahrenheit, functioning as a primary fail-safe to interrupt the burner circuit or unit operation if internal temperatures exceed engineered safety thresholds. As a critical HVAC safety control, it prevents heat exchanger fatigue and potential fire hazards caused by restricted airflow or blower failure. Utilizing a robust bi-metal sensing element, these York furnace parts are designed for direct mounting into the plenum where they can accurately detect heat spikes. The manual reset requirement ensures that a technician must inspect the system for the root cause of overheating before the equipment can be cycled back into service. Integrating this 200F thermal switch ensures your installation remains compliant with original equipment manufacturer specifications and maintains the mechanical safety loop integrity required for commercial and residential applications.

Key Benefits for Technicians

• Verified Trip Point: The 200F open limit provides a reliable thermal ceiling to protect sensitive internal components from heat damage.
• S1-025-27747-002 Compatibility: This OEM-spec control avoids the calibration drift often found in universal aftermarket thermal discs.
• Mechanical Manual Reset: Forces a physical inspection of the system, preventing dangerous automatic cycling during an overheat condition.
• Durable Terminal Construction: Heavy-duty spade connectors ensure a low-resistance electrical connection even in high-vibration furnace environments.

Common Questions

What are the symptoms of a tripped York S1-025-27747-002?
Usually, the furnace will drop the flame signal or lockout entirely, while the blower may continue to run to dissipate residual heat. If the manual reset button is popped, the system has exceeded its 200F thermal limit.

Why does this 200F temperature control keep opening?
Repeated tripping typically indicates a restriction in airflow. Check for a clogged 4-inch pleated filter, closed supply registers, or a blower motor with high internal resistance or a failing capacitor.

How do I verify the switch is defective versus just tripped?
Perform a continuity check across the terminals after pressing the reset button. If the circuit remains open while the system is cool and the button is depressed, the internal bi-metal disc has likely sustained mechanical failure and requires replacement.

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.