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The Goodman 10123529 is a genuine manual-reset high-limit / rollout safety switch for Goodman and Amana gas furnaces, including the AMH80453AXCC. This normally-closed switch opens the ignition circuit if it senses excessive temperature or flame rollout, shutting the furnace down to prevent overheating. Because it is a manual-reset device, it must be pressed to reset after a trip — repeated tripping signals an underlying airflow or combustion problem that should be diagnosed.
The genuine 10123529 is calibrated to the exact trip temperature specified for this furnace and matches the factory bracket and terminal layout. Generic limit switches with different trip points can cause nuisance shutdowns or, worse, fail to protect against overheating. For a safety control, the correct OEM part is essential.
Moderate (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Ten to fifteen minutes with basic tools. If the switch tripped, have a technician find the root cause before returning the furnace to service.
Authentic OEM safety component — match your furnace's original part number before ordering.