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The Goodman 10123539 is a genuine OEM manual reset limit switch used on the AMEC960804CNAB gas furnace. This temperature-activated safety control monitors for overheating or flame rollout and cuts power to the burners if a dangerous high-temperature condition is detected. Because it is a manual-reset device, it stays open after tripping until an operator presses the reset button — signaling that the underlying fault (blocked airflow, dirty filter, failing blower) should be investigated.
Safety controls are not the place to improvise. The OEM 10123539 is calibrated to the furnace's factory trip temperature and mounting footprint, ensuring it opens at the correct threshold. Generic switches with different trip points can nuisance-trip or, worse, fail to protect against a genuine overheat. Always use the OEM-specified part for safety circuits.
Moderate (3/5). Requires shutting off gas and power, disconnecting the wire leads, and unbolting the switch from the burner box or heat exchanger. Basic hand tools and a multimeter recommended. If a tripped switch keeps reopening, diagnose the root cause before returning the furnace to service — professional service advised.