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The Goodman 10123519 is a genuine OEM manual-reset high-limit / rollout safety switch for the GKS91155DXAE gas furnace. This thermally activated switch opens the control circuit when it senses excessive temperature — such as a blocked flue, failed blower, or flame rollout — shutting the furnace down to prevent heat-exchanger damage and unsafe operation. Because it is a manual-reset device, it must be physically reset by pressing the button after the fault is corrected, which is an intentional safety feature.
The OEM Goodman 10123519 is factory-matched to the correct trip temperature for this furnace's heat-exchanger geometry. Generic switches with the wrong open temperature will either nuisance-trip or, worse, fail to trip when needed. On a safety-rated limit control, always use OEM.
Easy (2/5) — Cut power, note the two wire locations, remove two mounting screws, swap, and reset the button. About 10 minutes. If it trips again immediately, diagnose the underlying overheat cause before continued operation.