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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Goodman/Amana AMH80453AXCA gas furnace. This manual-reset thermal cutout (commonly a rollout or auxiliary safety limit) opens permanently when it detects excessive heat — such as flame rollout from a cracked heat exchanger or a blocked flue — and must be pressed to reset once the fault is corrected. Because it requires a manual reset, it forces a technician to investigate the underlying problem rather than allowing repeated unsafe cycling.
Manual-reset safety limits are the furnace's last line of defense against flame rollout and overheating. Genuine OEM switches trip at the factory-specified temperature and reliably latch open. Generic substitutes may vary in trip point or reset behavior, so OEM is strongly recommended for this safety-critical part.
Easy (1/5). A two-wire, bracket-mounted swap. Cut power and gas, note the wiring, remove the mounting screws and spade connectors, install the new switch, and reconnect. About 10–15 minutes. Critically, always find and fix the cause of the rollout or overheat before restoring the furnace to service.