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The Goodman 10123529 is a genuine OEM manual-reset rollout limit switch engineered for the AMH80803BNAA 80% AFUE gas furnace and compatible Goodman and Amana models. This normally-closed thermal safety control opens the ignition circuit if it detects flame rollout or excessive heat at the burner box, shutting the furnace down to protect the heat exchanger and your home. Because it is a manual-reset device, it requires a physical button press to restore operation after a fault — a deliberate design that alerts homeowners to underlying combustion problems.
OEM vs. Generic: The genuine Goodman part is calibrated to the exact trip temperature specified for this heat exchanger and mounts with the correct bracket geometry. Generic aftermarket switches may trip at incorrect temperatures or fit loosely, causing nuisance shutdowns or, worse, failing to protect the unit. For a safety-critical control, OEM is strongly recommended.
Install difficulty: Easy (1/5). Two screws and two spade connectors. Always disconnect power before servicing and confirm the root cause of any rollout trip before resetting.