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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-limit safety control for AMVC80604BXAA two-stage variable-speed gas furnaces and compatible Goodman/Amana models. Mounted on the heat-exchanger/blower bulkhead, the primary limit monitors supply-air temperature and shuts off the burners if the furnace overheats — typically from restricted airflow, a dirty filter, a failing blower, or closed registers. It is an automatic-reset control that recloses once temperatures return to normal.
OEM vs. Generic: The 150°F set point and mounting-bracket geometry are matched to this furnace's cabinet and airflow design. A generic limit with a different temperature or bracket can cause repeated shutdowns or bypass protection entirely. The genuine 20162903 delivers the exact trip point and fit the furnace was engineered around, keeping the high-limit safety chain intact. OEM is the recommended choice for this safety component.
Install difficulty: Easy (1/5). Cut power, transfer the wires one at a time to avoid mix-ups, remove the two mounting screws, and install the new switch in the same location and orientation. If the old limit was tripping, correct the airflow restriction (filter, blower, ducting) before restarting.