York S1-024-39490-000 Pressure Switch

The S1-024-39490-000 is a factory-caliber York pressure switch engineered to monitor vital air pressure differentials within the combustion blower assembly. This -0.26 WC pressure switch acts as a primary safety limit, confirming that the inducer motor is exhausting flue gases effectively before allowing the gas valve to energize. Built as a furnace pressure switch replacement, this component is the direct functional successor to the 024-27557-000, ensuring a seamless drop-in fit for technicians servicing York, Coleman, and Luxaire systems. By utilizing a high-sensitivity diaphragm and precise electrical contacts, this HVAC combustion safety sensor prevents hazardous operation during venting obstructions or motor degradation. Its construction is designed to withstand the thermal stress of the furnace cabinet while maintaining accurate trip points. For contractors performing furnace pressure switch troubleshooting, this OEM part provides the exact electrical resistance and pneumatic response required to clear lockout codes and restore the furnace's safety sequence to original manufacturer specifications.

• Direct OEM Replacement: replaces legacy part number 024-27557-000 with identical mounting and electrical specs.
• Optimized Set Point: Factory-calibrated at -.26" WC on rise to ensure precise safety cut-offs for specific residential furnace platforms.
• Durable Construction: Engineered with robust materials to resist diaphragm fatigue and terminal corrosion over long service cycles.
• Plug-and-Play Installation: Features standard 1/4-inch male spade terminals and a universal mounting bracket footprint for rapid field replacement.

Common Questions

What are the symptoms of a failing S1-024-39490-000? Typically, the furnace will trigger a 2-flash or 3-flash error code on the control board, the inducer fan will run, but the igniter will fail to glow because the switch contacts remain open.

Can I substitute this with a switch that has a different WC rating? No. Safety switches must match the manufacturer's specified water column rating exactly. Installing a switch with an incorrect rating can lead to incomplete combustion or delayed ignition.

Does this switch handle the 120V circuit or 24V? This switch is designed for the 24VAC safety pilot circuit. Always verify the voltage at the control board during your diagnostic sequence to ensure the signal is reaching the switch.

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.