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The genuine OEM Goodman 10123517 is a manual-reset high-limit safety switch for the ACVC950915DXAD gas furnace. It monitors heat exchanger temperature and trips to shut off the burners if the furnace overheats — protecting against blocked airflow, a failed blower, or a cracked heat exchanger. Because it is a manual reset device, it stays open after a fault until you physically press the reset button, ensuring a serious condition gets inspected rather than silently repeating.
This genuine OEM switch is calibrated to Goodman's exact trip temperature for this furnace, so it protects without nuisance trips. Generic-temperature substitutes may open too early (causing no-heat calls) or too late (defeating the safety margin). For a code-compliant, properly rated safety component, use the OEM part.
Easy (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Reconnect, restore power, and verify the reset button is engaged. About 15–20 minutes.