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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety cutout for the Amana/Goodman AMH81205DNBA gas furnace and compatible models. Unlike auto-reset limits, this switch stays open after tripping and must be manually reset with its integral button — an intentional safety feature that forces a service check after an overheat or flame-rollout event. It protects the heat exchanger and cabinet from dangerous temperatures caused by blocked airflow or combustion problems.
The genuine 10123529 is factory-set to the precise trip point required by this furnace's safety certification, with the correct bracket and terminal layout. Substituting a generic switch with a different setpoint can defeat rollout protection or cause nuisance lockouts. For a life-safety device, only the OEM part is recommended.
Easy (2/5). Shut off power and gas, disconnect the wire terminals, unscrew the switch, and mount the replacement. Investigate the root cause of any trip before returning the furnace to service. About 15 minutes.