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The Goodman 20162903 is a genuine OEM primary high-limit switch with a 150°F trip setpoint for the AMS80805CXAC gas furnace and compatible Goodman/Amana models. Mounted on the heat-exchanger/plenum, it opens the gas valve circuit if supply-air temperature climbs too high — typically from a dirty filter, blocked ductwork, or a failing blower. A defective limit causes intermittent shutdowns or, worse, fails to protect the exchanger.
The OEM 20162903 is matched to the exact 150°F setpoint and disc geometry engineered for this furnace. Generic limits with approximate trip points may nuisance-trip or fail to protect the heat exchanger. On a primary safety control, we strongly recommend OEM.
Easy. Disconnect power, remove the two spade terminals and mounting screws, seat the new switch flush against the plenum in the same orientation, and reconnect. Verify airflow and filter condition before restarting. A short repair for a qualified technician.