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The genuine OEM Lennox 80K26 pressure switch comes with its factory mounting bracket, making it a direct, ready-to-install replacement. As a key furnace safety device, it monitors the negative pressure generated by the draft inducer to confirm proper venting and combustion airflow, and it prevents the burners from firing until a clear exhaust path is proven.
Common failure symptoms: A failing 80K26 often causes the furnace to short-cycle, abort ignition, or throw a pressure switch error code. If the switch sticks open, the furnace won't produce heat; if it drifts out of calibration, you may experience intermittent lockouts and inconsistent heating performance.
Why OEM matters: Pressure switches are precisely calibrated to a trip point in inches of water column specific to your furnace model. The genuine Lennox 80K26, supplied with the correct bracket, ensures the exact setpoint, port arrangement, and secure mounting your system was designed for — safeguarding reliable operation and your warranty. Non-OEM switches with mismatched calibration risk nuisance faults or unsafe combustion conditions.