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The Goodman 10123534 Manual Reset Limit Switch is a genuine OEM safety control for the ACSS960804CNAA gas furnace and compatible Goodman/Amana models. This high-limit switch monitors heat-exchanger and plenum temperature, cutting power to the gas valve if the furnace overheats. Its manual-reset design requires a deliberate technician reset after a trip — a built-in safeguard that flags persistent airflow or overheating problems before the furnace is allowed to restart.
This genuine Goodman OEM switch is calibrated to the exact trip temperature specified for your furnace's heat exchanger. Generic limit switches with the wrong cutoff point can nuisance-trip or, worse, fail to protect against a genuine overheat. As a safety device, OEM calibration is strongly recommended.
Difficulty: Moderate (3/5). Shut off power and gas, remove the mounting screws, transfer the spade wire terminals to the new switch, and remount. Verify correct orientation and confirm the reset button is engaged before restoring power. If the switch trips again after reset, have airflow and the heat exchanger inspected by a professional.