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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control built for the ACEC801005CXAA and compatible Goodman/Amana furnaces. This manual-reset switch trips and locks open on an overtemperature or flame-rollout event, shutting down the burner until a technician confirms the cause and presses the reset button — a deliberate design that prevents a dangerous condition from cycling unnoticed.
The OEM 10123529 is factory-calibrated to your furnace's exact trip temperature, ensuring it activates at the correct threshold. Generic switches with approximate set points can trip prematurely or, worse, too late. Because this is a critical safety lockout, genuine OEM is strongly recommended.
Easy (1/5). A straightforward two-wire replacement completed in about 15 minutes. Always disconnect power at the breaker before servicing, and diagnose the root cause of any rollout before resetting.