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The genuine Goodman 10123518 is a manual-reset high-limit / rollout safety switch for the Amana/Goodman AMV90453BXAB furnace and related models. This normally-closed thermal switch opens and locks out the gas valve if it senses an overheat or flame-rollout condition, protecting the heat exchanger and home. Because it is manual reset, it must be physically pressed to restore operation after a fault — a deliberate safety design. A tripped or failed switch is a common cause of a furnace that heats briefly then locks out on no-heat.
OEM limit switches are calibrated to the exact trip temperature Goodman specifies for this cabinet and heat exchanger. Generic switches may carry a different set point, causing nuisance trips or — worse — failing to trip when they should. On a life-safety control, use only the OEM-rated part.
Easy — Power off, note wire positions, unbolt the switch bracket, transfer the two spade connectors, and remount. Typically 15 minutes. Diagnose the root cause of any rollout before resetting.