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The genuine Goodman 10123529 Manual Reset Limit Switch is a high-temperature safety cutout for the ACVM971005CNBA gas furnace. It opens the control circuit to shut down the burners if the heat exchanger or cabinet temperature exceeds a safe threshold, protecting the unit and home from overheating. Because it is a manual reset design, it stays open until physically reset—forcing a deliberate inspection after any trip.
This OEM Goodman switch is calibrated to the furnace's exact trip temperature and mounting footprint. Generic substitutes may carry a different temperature rating or terminal layout, which can cause nuisance trips or—worse—fail to protect the unit. For a safety component we strongly recommend the OEM part.
Moderate (2/5). Shut off power and gas first. Disconnect the spade terminals, remove the two mounting screws, install the new switch in the same orientation, and reconnect the wiring. A repeated trip indicates an underlying airflow or combustion fault that should be diagnosed by a licensed technician before returning the unit to service.