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The genuine OEM Lennox 80K28 pressure switch ships complete with its mounting bracket for a fast, correct installation. This safety control verifies proper venting and combustion airflow by sensing the negative pressure produced by the inducer motor, and it must prove a clear flue before your furnace will allow the burners to ignite.
Common failure symptoms: When the 80K28 fails, the furnace typically short-cycles, locks out during the ignition sequence, or displays a pressure switch fault. A stuck-open switch prevents any heating, while a stuck-closed switch can bypass a vital safety check — either condition calls for immediate replacement.
Why OEM matters: The switch's calibrated trip point, measured in inches of water column, is matched to your specific Lennox furnace. The genuine 80K28 — with the factory bracket already fitted — guarantees correct pressure rating, port configuration, mounting alignment, and electrical connections. Aftermarket alternatives with incorrect setpoints or improvised mounting can cause nuisance lockouts, airflow-sensing errors, or unsafe operation, and may void your equipment warranty.