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The genuine OEM Lennox 93W94 pressure switch — supplied complete with its mounting bracket — is a safety device that confirms proper venting and draft before your furnace ignites. It senses the negative pressure created by the draft inducer, verifying that combustion gases can be safely exhausted, and only then allows the ignition sequence to proceed. The included bracket ensures correct positioning and a factory-accurate install.
Common failure symptoms: When the 93W94 switch fails or clogs, the furnace may fail to ignite, short cycle, lock out on a pressure-switch fault code, or refuse to start entirely on a call for heat. A blocked hose, cracked diaphragm, or switch stuck open are the typical causes of a furnace that spins up the inducer but never lights.
Why OEM matters: Pressure switches are calibrated to a specific trip point measured in inches of water column, and a mismatched aftermarket switch can allow unsafe operation or cause false lockouts on Lennox equipment. The factory-original 93W94 with bracket guarantees the correct pressure rating and mounting for safe, reliable venting. In stock and ships same day.