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The 20162903 is a genuine Goodman/Amana primary high-limit switch rated to open at 150°F, designed for the AMEH800805DXAA gas furnace. This safety cutout monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger, blower, and your home from dangerous conditions caused by restricted airflow or a dirty filter. A failed limit switch causes short-cycling, no-heat calls, or a furnace that won't fire at all.
The OEM 20162903 is calibrated to the exact 150°F trip point and mounting footprint your furnace requires. Generic limits with different setpoints or bracket geometry can nuisance-trip or fail to protect the heat exchanger. OEM ensures correct, code-compliant safety operation.
Easy to Moderate — disconnect power, unplug the two spade terminals, remove two mounting screws, and install the replacement. Verify airflow and filter condition, since repeated tripping usually signals an underlying airflow problem.