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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for AMEH800805CNAA gas furnaces and compatible Goodman/Amana models. This switch monitors furnace temperature and trips to cut power to the gas valve if the unit overheats, protecting against heat-exchanger damage and fire. Because it is a manual-reset design, it requires the button to be pressed after a fault — a tripped or failed switch is a common cause of a furnace that shuts down or won't fire.
The OEM 10123529 is calibrated to the exact trip temperature specified for this furnace. Generic limit switches with the wrong set point can nuisance-trip or, worse, fail to trip during a genuine overheat. For a life-safety component, always use the OEM part.
Easy to Moderate — two mounting screws and two spade terminals after disconnecting power. Confirm the replacement matches the original trip temperature. Estimated time: 15–20 minutes.
Genuine safety part from NationalHVACParts.com. Need fitment help? info@nationalhvacparts.com.