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The genuine OEM Lennox 80W58 pressure switch (also identified as 103247-10, rated at .75" W.C.) is a safety control that confirms proper draft and venting before your furnace is allowed to fire. By sensing negative pressure created by the inducer motor, this switch verifies that combustion gases can be safely vented, protecting your home from unsafe operation.
A faulty or stuck 80W58 pressure switch commonly causes a furnace that ignites briefly and then shuts down, a unit that won't start at all, or an error code indicating an open or stuck-closed pressure switch. Blocked vents, a failing inducer, or a worn switch can all trigger these lockouts, but a degraded switch itself frequently prevents the ignition sequence from completing.
Choosing the OEM 80W58 matters for Lennox equipment because the switch's exact trip point (.75" W.C.) and connection design are calibrated to the furnace's venting requirements. A factory-matched pressure switch ensures the safety circuit reads draft accurately, prevents nuisance lockouts, and maintains the safe, code-compliant operation Lennox engineered into the system.