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The genuine Goodman 10123535 is a red-button manual-reset high-limit / rollout safety switch for the Amana/Goodman AMV90453BXAB furnace and related models. The red cap denotes its specific factory trip temperature, so it is not interchangeable with same-size switches of a different color/rating. This normally-closed thermal control locks out the gas valve on an overheat or flame-rollout event and must be manually reset once the fault is corrected. It is a frequent culprit behind furnaces that ignite, run briefly, and then shut down on a safety lockout.
Color-coded reset switches like this one must match the exact OEM trip point — the red rating is engineered for this furnace's location and airflow. A generic or wrong-color substitute can nuisance-trip or fail to protect the heat exchanger. Always replace with the identical OEM part number.
Easy — Power off, transfer the two spade connectors, unbolt and remount the bracket. About 15 minutes. Confirm and clear the overheat cause before resetting.