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The genuine OEM Goodman 20162903 Primary Limit Switch is a 150°F high-limit safety control for the Amana/Goodman AMVC80603BXBD 80% AFUE gas furnace. Mounted on the heat exchanger / blower deck, this normally-closed switch opens if supply-air temperature exceeds its set point — shutting down the burners to prevent heat-exchanger damage from restricted airflow, a dirty filter, or a failed blower. When temperatures return to normal it automatically resets, so no manual intervention is needed for a routine trip.
OEM vs. Generic: Primary limits are set-point specific. The genuine 20162903 carries the exact 150°F rating and bracket dimensions Goodman specifies for this platform. Substituting a limit with a different open temperature or L-length can cause nuisance lockouts or, worse, fail to protect the heat exchanger. OEM is strongly recommended.
Install difficulty: Easy (10–15 min). Disconnect power, note wire positions, remove the two mounting screws, and install the replacement in the identical location and orientation. If the new limit keeps tripping, check the filter, blower speed, and ductwork for airflow restriction before assuming a bad part.