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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the ADSS801005CXAC gas furnace. This limit switch monitors heat-exchanger or plenum temperature and cuts power to the gas valve if the furnace overheats. Its manual-reset design keeps the furnace locked out after a trip until the fault is inspected and the button is pressed — an important safety feature against overheating conditions.
The genuine OEM Goodman switch is calibrated to the exact trip temperature specified for the ADSS heat exchanger. Because this is a safety device, an incorrectly rated generic switch can either nuisance-trip or, worse, fail to open at the right temperature. For a life-safety cutout, always use the factory-specified OEM part.
Moderate (2/5). Disconnect power and gas, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Do not bypass or jumper a tripped limit switch. If it keeps tripping, have a licensed technician diagnose the root cause (airflow, dirty filter, or blower fault).