York S1-024-35285-000 Pressure Switch

Ensuring consistent furnace performance requires high-precision components like the York S1-024-35285-000 Pressure Switch. This OEM furnace pressure switch is a critical safety control designed to monitor air pressure within the combustion chamber and vent piping. Configured as a Single Pole Normally Open (SPNO) switch, it features a "Close on Fall" action with a setpoint of -0.75" WC (Water Column). This specific calibration ensures that the inducer motor is generating the necessary draft to safely exhaust combustion gases before the ignition sequence initiates. For technicians troubleshooting furnace short cycling or pressure switch stuck open error codes, this direct replacement maintains the original factory specifications for system sequence of operations. This HVAC pressure control is engineered for a precise 0.75 in WC differential, providing reliable signal feedback to the control board in demanding residential and light commercial heating applications.

• OEM Compatibility: Genuine factory replacement for York S1-024-35285-000 to ensure exact fit and 0.75" WC calibration.
• Enhanced Safety: Prevents furnace ignition if a blocked vent or failing inducer motor prevents proper drafting.
• Precise Switching: SPNO contact configuration provides reliable electrical continuity upon reaching the specified vacuum threshold.
• Durable Construction: Built to withstand the fluctuating temperatures and pressures typical of high-efficiency gas furnaces.

• How do I know if the pressure switch is the cause of my furnace not starting? If the inducer motor runs but the burners do not ignite, check for a 2-flash or 3-flash error code on the control board. Use a manometer to verify if the system is pulling a vacuum of at least -0.75" WC before condemning the switch.
• Can this switch replace a model with a different WC rating? No. Pressure switches are safety-rated for specific furnace btu/h and venting requirements. Always match the -0.75" WC rating of the S1-024-35285-000.
• What causes these switches to fail prematurely? While mechanical failure is possible, many "faulty" switches are actually responding to clogged drain lines, cracked vacuum hoses, or debris in the flue pipe.

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.