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The 10123529 is a genuine OEM manual-reset (rollout) limit switch for the Goodman/Amana AMH80805CXBB gas furnace. This normally-closed safety control mounts on the burner box and opens the ignition circuit if flames roll out of the heat exchanger — a serious condition caused by blockage or a cracked exchanger. Because it is manual reset, it stays tripped until a technician inspects the furnace and presses the button, preventing the unit from cycling into an unsafe state.
The OEM 10123529 is calibrated to Goodman's exact trip temperature, so it protects without nuisance tripping. Generic rollout switches may trip at the wrong threshold or use looser tolerances — dangerous on a safety device whose entire job is accurate response. Never substitute an auto-reset switch here; the manual reset is intentional.
Easy (2/5). Cut power to the furnace, unplug the two spade terminals, unscrew the switch, and mount the replacement. If the original had tripped, always find and fix the root cause (blockage, failed inducer, cracked heat exchanger) before returning the furnace to service.