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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for Goodman ADVC80603BXAA gas furnaces and compatible models. This switch monitors furnace temperature and cuts power to the gas valve if the unit overheats — for example, due to a blocked flue or failed blower — protecting the heat exchanger and preventing unsafe operation. As a manual-reset device, it must be reset by hand after a trip, alerting the homeowner that a fault occurred.
The OEM 10123529 is calibrated to the exact trip and reset temperatures Goodman specifies for this furnace's heat exchanger. Generic switches with different set points can nuisance-trip or, worse, fail to trip when needed. For a safety-critical control, always use the genuine OEM part.
Easy to Moderate — two mounting screws and spade terminal connections. Shut off gas and power first. If the switch has tripped, diagnose the underlying overheat cause before returning the furnace to service. Professional service recommended.