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The Goodman 10123534 manual reset limit switch is a genuine OEM safety control for the AMEC961004CNAA gas furnace. It monitors temperature at the heat exchanger or burner area and opens the control circuit if it detects an overheat or flame-rollout condition, shutting down the furnace to prevent damage and hazard. Because it is a manual reset device, it will not automatically re-energize after tripping — a deliberate design that forces inspection of the underlying fault before the furnace can restart.
Limit switches are calibrated to a specific trip temperature and terminal layout. The genuine OEM 10123534 guarantees the correct set point and mounting for your furnace. A generic switch with a different temperature rating can nuisance-trip or, worse, fail to trip when it should — defeating a life-safety function. On safety controls, always fit OEM.
Moderate (2/5). Disconnect power at the breaker, remove the burner/access panel, unplug the two spade terminals, unscrew the switch, and reverse to install. If the switch tripped, diagnose the overheat cause (blocked flue, dirty filter, blower fault) before pressing reset. Professional service recommended if unsure.