York S1-025-31813-000 Limit Switch

As a field-tested technician, you know that a drifting limit switch is a primary cause of nuisance trips and blower motor cycling issues. The York S1-025-31813-000 Limit Switch is a precise OEM replacement part engineered for high-accuracy thermal protection in residential and commercial York furnaces, as well as Coleman and Luxaire air handlers. Featuring a 3-inch insertion probe, this auto-reset limit switch is designed to monitor internal heat exchanger temperatures directly in the airflow path.

This component is factory-calibrated with a 160°F open temperature and a 130°F close temperature, maintaining a critical safety delta for 24V control circuits. The S1-025-31813-000 ensures that if the system experiences restricted airflow—often due to a clogged filter or a failing secondary heat exchanger—the circuit breaks before the unit sustains damage. For contractors, using this HVAC high limit control means a drop-in fit with standard spade terminals, eliminating the need for field modifications and ensuring the system returns to its safe operating temperature without manual intervention.

• Precise Thermal Calibration: Opens at 160°F (+/- tolerance) and automatically resets at 130°F to prevent heat exchanger fatigue.
• 3" Insertion Depth: Optimized probe length ensures the sensor reaches the hottest point of the air stream for accurate sensing.
• Direct OEM Compatibility: Verified fit for York S1-02531813000, maintaining the original safety specifications of the manufacturer.
• Automatic Reset Logic: Restores furnace operation once temperatures stabilize, reducing unnecessary service calls for simple over-temp events.

• Does this limit switch work for 120V circuits? This switch is typically rated for 24V pilot duty in furnace control strings; always verify your specific model's wiring diagram.
• Why does my furnace keep tripping this switch? Check for a dirty air filter, blocked return grilles, or a failing blower capacitor, as these cause the temperatures to hit the 160°F cutout.
• Can I use a 1" insert if this is 3"? No. The 3" probe is required to reach the specified monitoring zone; a shorter probe may lead to delayed tripping and unsafe heat levels.

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.