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The Goodman 20162903 is a genuine OEM primary high-limit switch rated to open at 150°F, designed for the AMVC80603BXBC two-stage variable-speed gas furnace. Mounted on the heat exchanger/plenum, this normally-closed thermal safety control shuts off the burners if supply-air temperature rises above the safe threshold — protecting the heat exchanger from overheating due to a stuck blower, blocked filter, or restricted ductwork. A furnace that short-cycles on heat or trips out often has a failed limit switch.
OEM limit switches are calibrated to the exact trip temperature specified for this furnace's heat exchanger. Generic switches with different set points can either nuisance-trip (no heat) or fail to protect the exchanger. For a safety-rated component, use the factory part.
Easy to Moderate — two mounting screws and two spade terminals. Cut power at the disconnect before servicing. Verify the correct temperature rating before installing.