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The genuine OEM Goodman 10123529 Manual Reset Limit Switch is a factory-original safety control engineered for the AMVC800604BXAB two-stage variable-speed gas furnace and compatible Goodman/Amana models. This high-limit switch monitors heat-exchanger temperature and trips the gas valve and burners open circuit if the furnace overheats, protecting your equipment and home from an unsafe condition. Because it is a manual-reset device, it will not automatically re-close after a fault — the reset button must be pressed once the underlying issue (dirty filter, blocked flue, failed blower) is corrected, giving you a clear signal that service is needed.
OEM vs. Generic: The Goodman OEM 10123529 is calibrated to the exact trip temperature specified for your furnace's heat exchanger, with the correct terminal spacing and mounting footprint for a drop-in fit. Aftermarket generics may use approximate trip points or require terminal adapters, which can cause nuisance trips or a switch that fails to protect. For a life-safety component, we strongly recommend the genuine OEM part.
Installation difficulty: Easy (1 of 5). A qualified DIYer or technician can replace this switch in 15–20 minutes with basic hand tools. Always shut off power and gas at the furnace before servicing. Note the wire positions, remove the two mounting screws, transfer the spade connectors, and reinstall. Confirm the reset button is engaged before restoring power. If the switch trips again after reset, do not bypass it — diagnose the root cause first.