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The genuine OEM Goodman 10123529 Manual Reset Limit Switch is the high-temperature safety control for the Goodman/Amana AMVC81005CNAA gas furnace. This normally-closed switch opens and shuts off the gas valve if it senses flame rollout or an overheated burner/heat-exchanger area, then requires a manual push-button reset — a deliberate safety design that forces inspection before the furnace can restart.
If your furnace locks out on ignition and will not restart until the red button is pressed, a tripped or failed manual-reset limit is a common cause. Replacing it with the exact OEM switch restores the furnace's flame-rollout protection.
OEM switches carry the exact factory trip temperature and terminal orientation. A generic switch with the wrong cutout point either nuisance-trips or, worse, fails to protect against rollout. For a life-safety component, OEM is strongly recommended.
Two spade terminals and a couple of screws; verify the replacement's trip rating matches. Never bypass a safety limit. Disconnect power and diagnose the root cause of any trip before replacing.