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The Goodman 10123529 is a genuine OEM manual-reset high-limit switch for the ADSS800403AXAD gas furnace and compatible Goodman/Amana models. This safety control monitors heat-exchanger temperature and opens the circuit if the furnace overheats — protecting the heat exchanger, blower, and your home from unsafe operation. Because it is a manual reset, it locks out after a trip and must be reset by hand, alerting you to an underlying airflow or combustion problem.
OEM limit switches are calibrated to the exact trip temperature specified for your furnace. Generic switches may trip early (nuisance lockouts) or late (unsafe). For a safety-rated combustion control, always use the genuine Goodman part.
Easy. Cut power at the breaker, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Typical time: 10–15 minutes. If the switch keeps tripping after replacement, have a technician check airflow and the heat exchanger.