York S1-2702-316P/A Limit Switch

The York S1-2702-316P/A Limit Switch is a critical safety component engineered for precise thermal regulation within York and Johnson Controls HVAC systems. This HVAC high limit switch functions as a primary safety cut-out, monitoring heat exchanger temperatures to prevent overheating conditions that can lead to equipment failure or hazardous operation. As a direct replacement for S1-2702-3161/A, as well as the S1-2702-316P and S1-2702-316PA models, this unit ensures backward compatibility and streamlined installation for field technicians. It features the CLS-145 specification, typically indicating a fixed temperature trip point designed to match original factory settings. When troubleshooting a furnace that is cycling on limit or failing to initiate the burner sequence, verifying the York furnace parts continuity is essential. This switch, also identified by part number OP-175, provides the reliable mechanical break needed in the 24V control circuit to maintain system integrity during high-static or low-airflow events.

Key Benefits

• OEM Compatibility: Specifically designed to replace legacy S1-2702-3161/A and S1-2702-316PA components without modifications.
• Critical Safety Integration: Monitors heat exchanger discharge air to ensure the system operates within safe thermal parameters.
• Simplified Diagnostics: Standardized terminal connections allow for rapid testing and internal resistance verification.
• Durable Construction: Built to withstand constant thermal cycling common in residential and light commercial air handlers.

Common Questions

What is the S1-2702-316P/A replacement process?
Ensure power is disconnected before removing the access panel. This limit switch is typically mounted on the furnace plenum or blower housing. Verify the temperature rating on the CLS-145 matches the existing failed component before securing the new switch.

Why is my York furnace cycling on this limit switch?
Frequent tripping of the S1-2702-316P/A often indicates airflow restrictions, such as a clogged filter, blocked return vents, or a failing blower motor, rather than a faulty switch itself.

Can I use this switch for other York furnace models?
This part is specifically rated for units requiring the OP-175 or 2702-316P/A series. Always check your specific model’s parts list to ensure the temperature setpoints align with the 145-degree specification.

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.