York S1-024-40872-000 Pressure Switch

The York S1-024-40872-000 Pressure Switch is a critical safety component designed for precise HVAC pressure monitoring in residential and light commercial furnaces. This 0.75" WC pressure switch functions as a draft inducer safety switch, verifying that the inducer motor is creating sufficient static pressure to vent combustion gases before the ignition sequence begins. As a genuine S1-024-40872-000 OEM replacement, it ensures your equipment operates within the manufacturer's specified tolerances, preventing hazardous conditions associated with venting failures or blocked flues.

This unit is the direct factory-authorized replacement for legacy part numbers 9371VO-BS-0026 and S1-024-35785-000. For technicians in the field, this means a drop-in installation with high-corrosion-resistant terminals and a calibrated diaphragm that maintains accuracy under fluctuating thermal conditions. When dealing with diagnostic codes related to pressure switch circuits, utilizing a York furnace pressure switch eliminates the calibration drift often found in universal "will-fit" alternatives, ensuring long-term system reliability and stable performance.

• Direct OEM Match: Engineered specifically for York, Luxaire, and Coleman equipment to ensure correct trip points.
• High-Accuracy Calibration: Fixed 0.75" set point prevents nuisance tripping while maintaining strict safety standards.
• Cross-Compatibility: Replaces obsolete components 9371VO-BS-0026 and S1-024-35785-000 without modification.
• Durable Construction: Built to withstand the high-heat environment of the furnace vestibule.
• Integrated Safety: Rapidly detects low-draft or blocked-flue conditions to terminate the heating cycle.

How to troubleshoot a pressure switch stuck open?
If the control board signals a "stuck open" fault, first inspect the inducer port and silicone tubing for debris or moisture. If the draft is verified with a manometer but the York S1-024-40872-000 fails to close, the internal diaphragm or electrical contacts have likely failed, necessitating a replacement.

Is York S1-024-40872-000 compatible with my furnace?
This switch is compatible with a wide range of York-family furnaces requiring a 0.75" rating. Technicians should always check the dataplate on the original switch or the equipment’s parts list to confirm the required WC (Water Column) rating before installation.

What replaces the 9371VO-BS-0026 switch?
The S1-024-40872-000 is the current official successor to the 9371VO-BS-0026, offering improved reliability and the exact same mounting footprint and electrical specifications.

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.