OEM Lennox Pressure Switch — 26W46

The genuine OEM Lennox 26W46 pressure switch is a combustion-air safety control used in Lennox gas furnaces. It senses the negative pressure created by the inducer draft motor and closes its contacts only when adequate venting airflow is proven. This proving step tells the furnace control board that it is safe to proceed with ignition, protecting your system and your home from unsafe venting or flue restrictions.

A failing 26W46 often shows up as a furnace that won't light, an inducer motor that runs but never fires the burners, short cycling, or a persistent pressure-switch fault code. Blocked condensate drains, torn tubing, and worn internal contacts are typical culprits that keep the switch from closing on a valid draft.

OEM matters here because the 26W46 is factory-calibrated to the precise pressure threshold your Lennox model demands. A generic switch with a mismatched set point can trigger nuisance lockouts or fail to protect against real venting problems. Installing the correct Lennox part guarantees an exact fit, the right trip pressure, and dependable, safe heating performance.