Description
The York S1-024-35270-000 is a factory-specified furnace pressure switch designed to monitor and verify proper inducer blower operation before allowing ignition to proceed. With a set point of -0.45″ WC (inches water column), this Single Pole, Normally Open (SPNO) switch closes on a fall in pressure — meaning the contacts close when the sensed pressure drops to or below the calibrated set point, confirming that the draft inducer is generating the correct negative pressure for safe venting.
This OEM replacement switch is engineered to York’s exact specifications, ensuring reliable performance and a direct fit in compatible York furnace models. Replacing a failed or out-of-tolerance pressure switch with the correct OEM part helps prevent nuisance lockouts, protects against unsafe ignition conditions, and maintains system efficiency.
Key Features
- Set point: -0.45″ WC (inches water column)
- Switch type: SPNO — Single Pole, Normally Open
- Action: Close on Fall — contacts close when pressure drops to set point
- OEM York replacement part — direct-fit for compatible York furnace models
- Monitors inducer blower negative pressure to confirm safe venting before ignition
- Helps prevent unsafe ignition under improper draft conditions
Application
- York residential and light commercial gas furnaces
- Used as a safety interlock in the furnace ignition control sequence
- Replacement for failed, stuck, or out-of-calibration draft pressure switches
Why Replace with OEM?
Using the correct OEM pressure switch ensures the calibrated set point matches the furnace’s designed operating parameters. An incorrect set point can cause nuisance no-heat calls or — more critically — allow ignition under unsafe venting conditions. The York S1-024-35270-000 eliminates guesswork and ensures your repair meets the original equipment specification.
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