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The genuine Goodman 10123533 is a manual-reset high-limit safety switch for the AMV90704CXAB gas furnace. This control monitors temperature at the heat exchanger or burner area and opens the ignition circuit if it detects an overheat or flame-rollout condition, shutting the furnace down to prevent damage or hazard. Because it is manual-reset, it stays tripped until the underlying issue is corrected and the button is pressed — an important safety behavior that keeps a faulted furnace from short-cycling.
The OEM 10123533 carries the exact trip temperature, terminal layout, and mounting bracket the furnace was designed for. A generic switch with a different set point or bracket can nuisance-trip, fail to protect, or fit poorly. As a life-safety control, this is a component where OEM specification matters most.
Moderate (2/5). Disconnect power, remove the two wire leads and mounting screws, install the replacement, and confirm operation. Simple hand tools; 15–20 minutes. Diagnose and clear the root cause of any trip before returning the furnace to service.