York S1-6806-3351 Limit Switch

The York S1-6806-3351 Limit Switch is a critical safety component designed for high-performance thermal regulation in York HVAC systems. Engineered for precision, this bimetal limit control features a factory-calibrated setpoint to protect the heat exchanger from overheating conditions. With a switch opening temperature of 150°F and a closing temperature of 115°F (Cl115 Op150), it ensures the burner circuit is interrupted if internal temperatures exceed safe operational envelopes, effectively preventing equipment damage and potential fire hazards.

For veteran technicians, the S1-6806-3351 serves as a direct OEM replacement part for model 6806-842, providing seamless diagnostic integration with control boards. When troubleshooting short-cycling or continuous blower operation, this high limit safety switch provides the reliable continuity required for system restoration. Built for industrial-grade durability, this switch maintains tight tolerances across repeated thermal cycles, ensuring consistent furnace limit control and safety compliance in residential and light commercial applications.

• Precise Thermal Trip Points: Optimized with a 150°F open and 115°F close differential to maintain safe heat exchanger temperatures.
• OEM Compatibility: Specifically designed for York heating equipment, including cross-reference 208W92.
• Enhanced Safety: Acts as a primary furnace safety sentinel, preventing hazardous overheating due to airflow restrictions or blower failure.
• Contractor Grade Durability: Robust construction capable of enduring rigorous HVAC duty cycles without drifting from setpoint.

How do I test the York S1-6806-3351 for continuity?
With the power disconnected and wires removed, use a multimeter to check for continuity at room temperature. A functional switch will show a low resistance reading (closed). If it sits open at room temperature, the switch has failed and requires replacement.

What causes this limit switch to trip repeatedly?
Frequent tripping is usually a symptom of airflow issues, such as a clogged filter, blocked return vents, or a failing blower motor. Always verify manifold pressure and temperature rise against the unit rating plate before assuming the switch itself is faulty.

Is this an auto-reset or manual-reset switch?
The S1-6806-3351 is an auto-reset limit switch. Once the plenum temperature drops below the 115°F closing threshold, the circuit will automatically re-engage to allow for continued operation.

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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.