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The Goodman 10123529 is a genuine OEM manual reset high-limit switch engineered for the ADSH800403AXAC gas furnace and compatible Goodman/Amana models. This safety-critical component monitors heat-exchanger temperature and opens the control circuit if the furnace overheats, protecting the unit and your home. Because it is a manual reset design, it will not silently cycle back on after a fault — it requires a physical reset, alerting you to underlying airflow or ignition problems.
This is a true OEM Goodman switch built to exact factory trip temperatures and terminal spacing. Generic aftermarket switches often use approximate set points that can cause nuisance trips or, worse, fail to protect the heat exchanger. For a safety device, we strongly recommend genuine OEM.
Easy (1 of 3). Two spade terminals and two mounting screws — a typical swap takes under 15 minutes. Always shut off power and gas before servicing. If the switch trips repeatedly after replacement, have a technician diagnose airflow or burner issues.