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The Goodman 10123529 is a genuine OEM manual-reset limit switch for the Amana/Goodman AMES800803BXAA gas furnace. This normally-closed safety control opens the ignition circuit if it senses excessive temperature — protecting against blocked airflow, a failed blower, or flame rollout. Because it is a manual reset, it will not self-restore, forcing a service check before the furnace can fire again.
Limit switches are calibrated to a specific trip temperature and mounting footprint. An OEM Goodman/Amana switch guarantees the correct cutout point and terminal orientation. A mismatched generic switch may trip early (nuisance shutdowns) or, worse, trip late — defeating the safety function. For any safety control, OEM is the responsible choice.
Easy — Power off, disconnect the two terminals, unscrew the switch, and reverse. Typically a 10–15 minute repair. If the switch keeps tripping after replacement, diagnose the underlying airflow or gas issue.