OEM Lennox Pressure Switch with Bracket — 26W76

The genuine OEM Lennox 26W76 is an air pressure switch supplied with its factory mounting bracket, designed as a critical safety control in your Lennox furnace. This switch monitors draft and airflow through the venting system, verifying that the inducer blower is establishing proper combustion airflow before the control board allows the gas valve and igniter to energize. By confirming safe venting conditions, the 26W76 helps protect your home against flue blockages and dangerous flue-gas spillage.

When a pressure switch like the 26W76 fails or drifts out of calibration, common symptoms include a furnace that ignites briefly then shuts down, the inducer motor running continuously without ignition, repeated lockout codes, or no heat at all. Cracked hoses, a stuck diaphragm, or contacts that no longer close on a proven draft will all trip the safety circuit.

Choosing an OEM Lennox replacement matters because the 26W76 is calibrated to the exact pressure set point your specific Lennox model requires. Aftermarket switches with the wrong trip point can cause nuisance lockouts or, worse, bypass the safety logic the system depends on. Installing the correct factory part with its matched bracket ensures proper fit, rated performance, and safe, reliable furnace operation.