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The Goodman 10123529 is a genuine manual-reset limit (rollout) switch that acts as a critical safety device on Goodman and Amana gas furnaces such as the AMH80804BNBD. Mounted near the burner box, it senses abnormal flame rollout or excessive heat and instantly cuts power to the gas valve to prevent overheating and unsafe operation. Because it is a manual-reset design, a tripped switch signals an underlying issue that should be inspected before resetting.
As a safety-critical component, using the OEM Goodman switch ensures the exact trip temperature and reset behavior specified by the factory. Generic switches with incorrect trip points can either nuisance-trip or, worse, fail to protect the furnace. OEM is strongly recommended for any safety limit.
Easy to Moderate — typically a two-wire spade connection and one or two mounting screws. Shut off gas and power first. Diagnose the cause of any rollout before replacing and resetting.