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The Goodman 10123529 is a genuine OEM manual reset high-limit switch built for the ADVC81005CNBA furnace and compatible Goodman/Amana models. This safety control monitors heat exchanger temperature and opens the circuit if the furnace overheats — protecting against blocked airflow, failed blowers, and cracked heat exchangers. Because it is manual reset, it forces a technician to inspect the root cause before the furnace can restart.
The OEM switch is factory-set to Goodman's exact trip and reset temperatures. Generic limit switches with mismatched setpoints can nuisance-trip or, worse, fail to trip — a genuine safety risk. Always match the OEM temperature rating.
Moderate (2/5). Disconnect power, unplug the two spade terminals, unscrew the switch from the burner box, and mount the replacement. Verify the reset button is seated after install.