York S1-024-39479-000 Pressure Switch

The York S1-024-39479-000 Pressure Switch is an OEM critical safety component specifically calibrated to a -0.33 WC set point. Designed for precise monitoring of the inducer motor's venting performance, this differential air pressure switch ensures the combustion process only initiates when proper static pressure is maintained. As a direct replacement for S1-024-25975-000, this unit resolves common sequence-of-operation failures where the circuit fails to close due to diaphragm fatigue or contact oxidation in older switches. When troubleshooting furnace pressure switch stuck open codes on York, Luxaire, or Coleman equipment, verifying the negative pressure against the -0.33" vacuum rating is essential for diagnostic accuracy. This HVAC inducer switch features a robust housing and high-conductivity terminals to withstand the thermal cycling typical in high-efficiency gas furnaces. Utilizing genuine York furnace replacement parts ensures the system operates within original factory specifications for bypass and venting safety.

Key Benefits

• Exact Calibration: Factory-set at -0.33" WC to ensure precise ignition safety sequences.
• Direct Fit: Seamlessly replaces legacy part number S1-024-25975-000 without mounting modifications.
• Reliable Switching: Engineered for high-cycle durability to prevent intermittent "open circuit" faults.
• OEM Standards: Maintains the UL safety listing and airflow integrity of the original HVAC equipment.

Common Questions

Why is my York furnace displaying a pressure switch stuck open error?
This often occurs if the York S1-024-39479-000 detects insufficient vacuum from the inducer, usually caused by a blocked vent, failing motor, or a ruptured internal diaphragm within the switch itself.

Can I use a switch with a different WC rating?
No. Pressure switches are safety devices calibrated to specific blower and venting specs. Installing a switch with a different WC rating can lead to dangerous combustion conditions or frequent system lockouts.

How do I verify if the S1-024-39479-000 is functioning?
Using a manometer, measure the actual vacuum pressure from the inducer port. If the pressure exceeds -0.33" WC but the switch contacts remain open on your multimeter, the switch 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.