York S1-025-31834-000 Limit Switch

The York S1-025-31834-000 Limit Switch is a critical OEM safety component engineered for narrow-tolerance thermal protection in York HVAC systems. As a manual reset (M/R) limit switch, this device is designed to interrupt the electrical circuit and lock out the ignition sequence if internal temperatures exceed the 160°F open temperature setpoint. This ensures the unit does not attempt to recycle under unsafe conditions, protecting the heat exchanger and surrounding components from thermal stress and failure.

Built to precise Source1 factory specifications, the S1-025-31834-000 is frequently utilized as an auxiliary limit switch in residential and light commercial packaged units, including the DCYZ series 13 SEER gas/electric air conditioners and various ACP model series (e.g., ACP024G0701021C). The robust construction of this 160-degree limit switch provides the high-cycle reliability required by professional contractors for maintaining HVAC equipment safety standards and OEM performance integrity.

Key Benefits for Technicians:

• Exact OEM Replacement: Ensures full compatibility with York heating and cooling parts, eliminating the risk of mounting issues or improper setpoints associated with universal alternatives.
• Manual Reset Safety: Forces a manual inspection of the system before restarting, which is essential for diagnosing airflow or combustion issues that triggered the 160°F high-limit event.
• Thermal Protection Accuracy: Calibrated specifically to trigger at 160 degrees Fahrenheit to prevent heat exchanger damage and maintain system longevity.
• Wide Application: Fits a broad range of York gas/electric packaged units, making it a staple part number for service van inventory.

Common Questions:

Can I replace a manual reset switch with an automatic reset version?
No. For safety and compliance, always replace an M/R limit switch with the exact OEM manual-reset part number. Automatic reset switches may allow a system to continue operating under a chronic fault condition, leading to equipment failure.

Which York models are compatible with the S1-025-31834-000?
This switch is commonly found in York DCYZ and ACP series packaged units. You should always verify the part number against your specific unit’s data plate or parts list.

What causes a 160°F limit switch to trip?
A trip usually indicates restricted airflow—potentially from a dirty filter, blocked return, or a failing blower motor—or an over-fired burner assembly. Once the manual reset limit switch triggers, the underlying cause must be addressed before resetting the device.

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.