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The Goodman 10123529 is a genuine OEM manual reset high-limit switch for the AMEH800805DXAB gas furnace and compatible Goodman/Amana models. This safety control opens the ignition/gas circuit when it senses excessive temperature — such as from a blocked flue, failed blower, or dirty filter — and requires a manual reset button press to restore operation, alerting the homeowner that a fault occurred. A tripped or failed limit switch is a common cause of a furnace that ignites then shuts down or won't fire at all.
This genuine OEM switch is calibrated to the exact factory trip temperature and mounting footprint for your furnace. Because it is a safety device, an incorrectly rated generic switch may trip too early (nuisance shutdowns) or too late (a genuine safety risk). We strongly recommend the OEM part for any limit control.
Easy to Moderate — Power off, disconnect the two spade terminals, unscrew the switch, and install the replacement. Straightforward for a handy DIYer, but always diagnose why the limit tripped before returning the furnace to service.
Confirm fit with your model tag before ordering. Contact info@nationalhvacparts.com.