York S1-024-35268-000 Switch

The York S1-024-35268-000 is an essential OEM dual-stage air pressure switch designed for precision monitoring of combustion airflow in high-efficiency York, Coleman, and Luxaire gas furnaces. This SPNO (Single-Pole Normally Open) control is calibrated with two distinct setpoints: .70" WC and 1.25" WC, facilitating precise communication between the inducer motor and the ignition board during multi-stage heating cycles. Built to close on fall, it ensures the system achieves the necessary negative pressure to vent combustion gases safely before allowing the gas valve to energize. Optimized for variable speed upflow gas furnaces such as model FC9V100C20UP12B, this switch acts as a critical fail-safe against short cycling and ignition failure caused by flue obstructions or vacuum leaks. As a genuine Source1 replacement part, it guarantees exact matching of factory specs for negative pressure differential, maintaining the high-efficiency performance standards of 2-stage HVAC systems.

• Dual-Stage Calibration: Pre-set at .70" and 1.25" WC for accurate high-fire and low-fire pressure sensing.
• OEM Compatibility: Genuine York replacement part ensures proper fit and function in Coleman and Luxaire FC9V series furnaces.
• Safety Fail-Safe: Prevents furnace operation if the inducer motor fails to create a sufficient vacuum for safe flue gas venting.
• Robust Construction: Engineered to withstand the rigors of high-cycle operation and vibration within the combustion blower assembly.

What are the symptoms of a failing York S1-024-35268-000?
Typically, you will see a pressure switch open fault code on the control board. The furnace may start the inducer motor but fail to glow the igniter, or it may short cycle intermittently during the transition between heating stages.

Can I use a single-stage switch to replace this dual-stage model?
No. This control uses specific dual-pressure setpoints (.70 and 1.25) to manage two different firing rates. Replacing it with a single-stage switch will result in system lockouts or improper combustion on multi-stage equipment.

Does this switch resolve a "Pressure Switch Stuck Closed" error?
If the board detects the switch closed before the inducer starts, it is a safety lockout. While this could be a faulty internal diaphragm, a technician should also verify there is no moisture in the pressure switch tubing or a bypass in the wiring.

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.