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The Goodman 10123529 is a genuine OEM manual-reset high-limit safety switch for ADVC80805CXBB gas furnaces and compatible Goodman/Amana models. This normally-closed thermal switch opens to shut off the burners if it detects excessive temperature or flame rollout, protecting the heat exchanger and cabinet. Because it is a manual-reset device, it must be pressed to reset after a trip — repeated tripping indicates an airflow or combustion problem that should be diagnosed. A failed or fatigued switch can cause no-heat conditions or nuisance lockouts.
The OEM Goodman 10123529 is calibrated to the exact trip temperature the furnace was designed around, ensuring the safety circuit behaves correctly. Generic equivalents cost less but may use a different trip point or terminal layout. For safety switches we strongly recommend OEM to preserve the factory protection rating.
Easy. Turn off power, unplug the two wire leads, unscrew the switch bracket, mount the new switch, and reconnect. Typically a 10–15 minute repair with a nut driver.