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The Goodman 10123529 is a genuine OEM manual-reset high-limit / rollout safety switch for the WGGE4560A140MAB gas furnace. This normally-closed control opens the ignition circuit if it detects excessive heat or flame rollout, shutting the furnace down to prevent overheating and heat-exchanger damage. Because it is a manual-reset device, a tripped switch signals a real fault (blocked flue, dirty burners, cracked exchanger) that should be diagnosed before pressing the reset button.
The OEM 10123529 is calibrated to Goodman's exact trip temperature and mounting footprint. Generic limit switches with the wrong cutout point can nuisance-trip or, worse, fail to trip when they should. For a safety control, OEM calibration is not optional — it protects the equipment and the home.
Easy (2/5). Cut power and gas, unplug the two spade terminals, remove two mounting screws, and swap. About 15 minutes with a nut driver. Verify the underlying fault before returning to service.