OEM Lennox Pressure Switch Assembly — 24W49

The genuine OEM Lennox 24W49 pressure switch assembly is a safety control that confirms adequate combustion airflow and venting before your Lennox furnace ignites. It reads the negative pressure generated by the inducer motor and closes its contacts only when draft is correct, blocking the ignition sequence whenever the flue is obstructed or the inducer isn't performing.

A worn or failing pressure switch assembly typically shows up as ignition lockouts, short-cycling, or a furnace that won't start — often paired with a pressure-switch fault code on the control board. Cracked hoses, corroded terminals, and contacts that stick open or closed are the most common reasons for these intermittent no-heat calls.

Installing the OEM Lennox 24W49 ensures the assembly trips at the exact pressure setpoint your furnace was engineered around. As a safety-critical component, an aftermarket switch that reads outside spec can permit unsafe firing or generate repeated nuisance lockouts. The factory-matched calibration and hose fitment guarantee proper integration with the Lennox ignition control and reliable protection every heating cycle.