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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for AMH80805CNBA gas furnaces. This manual-reset switch (commonly used as a flame-rollout or high-limit safety) opens the control circuit and shuts down the burners if it senses abnormal heat, protecting against overheating and flame rollout. Because it is a manual-reset device, it must be physically reset after a fault — a tripped switch signals an underlying problem that should be diagnosed before restarting the furnace.
The genuine OEM 10123529 is calibrated to the furnace's exact trip temperature and uses the correct terminal and mounting pattern. Because this is a life-safety component, we strongly recommend OEM only — a generic switch with the wrong trip point can either nuisance-trip or, worse, fail to protect against a real overheat condition.
Easy (2/5). Cut power, disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Always find and correct the root cause (blocked flue, dirty burners, cracked heat exchanger) before resetting. Best performed by a licensed HVAC technician.