York S1-024-35308-000 Pressure Switch

The York S1-024-35308-000 is a critical safety component engineered for precise draft inducer monitoring in residential furnaces. This 0.60" WC pressure switch operates on SPST (Single Pole Single Throw) logic, functioning as a normally open contact that closes once the draft inducer motor generates sufficient negative pressure. It is a direct fit for various York, Luxaire, and Coleman units, ensuring the control board receives the necessary signal to proceed with the ignition sequence. Accuracy is paramount with a 0.60 inches of water column set point; using an out-of-spec HVAC draft inducer switch can lead to dangerous venting conditions or frequent system lockouts. This genuine York replacement part is built to withstand the rigors of high-cycle heating environments, providing reliable proof-of-air for the combustion process without the common failures often seen in universal aftermarket alternatives. Proper calibration ensures the system maintains the exact airflow margins required for safe heat exchanger operation.

Key Benefits

• OEM Precision: Calibrated specifically to a 0.60" WC set point for factory-standard safety performance.
• Reliable SPST Switching: High-quality internal contacts prevent intermittent signal loss during the startup sequence.
• Durable Construction: Engineered to resist diaphragm fatigue caused by moisture and flue gas temperature fluctuations.
• Drop-in Fitment: Standard mounting and terminal configurations allow for fast field replacement in York and Johnson Controls equipment.

Common Questions

What causes a York pressure switch to stay open? Most often, an open switch is caused by a blocked vent pipe, a failing inducer motor, or moisture buildup in the pressure tubing. If those are clear, the diaphragm in the York S1-024-35308-000 may have failed.

Can I use a higher WC rated switch as a replacement? No. The 0.60" WC rating is specific to the venting design of the furnace. Substituting a different rating can prevent the furnace from firing or allow it to operate under unsafe venting conditions.

Does this switch require specific orientation when mounting? For the most reliable operation and to prevent moisture from pooling on the diaphragm, it is best practice to mount the switch vertically as originally specified by the manufacturer.

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.