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The Goodman 10123529 is a genuine OEM manual-reset limit switch for the AMH80403AXBA 80% AFUE gas furnace. This normally-closed thermal safety trips and latches open on an overtemperature or flame-rollout event, shutting off the burners and requiring a physical pushbutton reset before the furnace can restart. The manual-reset design is intentional: a latched trip flags a real fault (blocked flue, cracked heat exchanger, or airflow failure) that must be diagnosed, not simply cycled past.
Manual-reset limits are calibrated to a specific trip temperature matched to this furnace's heat exchanger and rollout location. The OEM 10123529 guarantees that set point and the correct bracket/terminal orientation. Generic substitutes with a different trip temperature can either nuisance-trip or fail to protect against rollout — unacceptable for a safety control. Always fit OEM here.
Rated 2/5. Cut power, photograph and transfer the spade wires, remove the mounting screws, and install the new switch in the same position. Important: if the switch had tripped, find and correct the root cause (airflow, venting, or heat exchanger) before returning the furnace to service.