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The 10123529 is a genuine OEM Goodman manual-reset limit switch (flame-rollout safety) for the AMH81405DXCC gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the ignition/gas circuit if it senses abnormal heat from flame rollout or a blocked heat exchanger, then stays open until manually reset — a critical safety device that prevents dangerous over-temperature operation.
Because this is a life-safety component, the genuine Goodman 10123529 is calibrated to the exact trip temperature and mounting footprint specified for your furnace. Generic switches with the wrong trip point can nuisance-trip or, worse, fail to open when needed. For safety cutoffs, always use OEM.
Easy (1/5). Two mounting screws and two spade terminals. Power down the furnace, note the wire positions, swap the switch, and reconnect. If the old switch tripped repeatedly, diagnose the root cause (rollout, blocked flue, cracked heat exchanger) before returning the furnace to service.