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The genuine Goodman 20162904 Primary Limit Temperature Control is a factory OEM safety switch for the AMVC800803BNAB two-stage 80% AFUE gas furnace. Mounted on the heat exchanger/plenum, this high-limit switch continuously monitors supply-air temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger, blower, and your home. A failed or nuisance-tripping limit is a common cause of furnaces that fire briefly then shut down or lock out.
The OEM Goodman 20162904 is calibrated to your furnace's exact trip temperature and mounting footprint. Generic limits with a different set point can trip early (short cycling) or too late (a genuine safety risk). For a safety control, OEM is the right choice.
Easy to Moderate — power off at the breaker, remove two screws, unplug the wires, and reverse. Most DIYers can complete this in 15–20 minutes; confirm correct model fit before ordering.