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The Goodman 10123518 Manual Reset Limit Switch is a genuine OEM high-limit safety control engineered for the AMVC950453BXBA modulating variable-speed gas furnace and other compatible Goodman and Amana models. This switch monitors heat-exchanger and supply-air temperature and trips to shut down the burners when it detects an overheat condition — protecting the furnace from restricted airflow, a failed blower, or a clogged filter. Because it is a manual reset device, it will not automatically re-close after a fault, which forces a technician to diagnose the root cause before the unit runs again.
This is the genuine OEM Goodman part, calibrated to the exact trip temperature specified for your furnace. Aftermarket generics may carry a different set point, which can cause nuisance trips or, worse, fail to protect the heat exchanger. For a safety-critical component we strongly recommend the OEM switch.
Easy (1/5) — Two-wire replacement. Shut off power and gas, disconnect the leads, remove the mounting screws, and install the new switch in the same orientation. If the switch tripped, always identify and correct the overheat cause before returning the furnace to service.