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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for ACES800804BXAA gas furnaces and compatible Goodman/Amana models. This normally-closed thermal switch opens the gas/ignition circuit if it senses excessive temperature from a blocked flue, dirty filter, failed blower, or flame rollout — shutting the furnace down to prevent damage and hazards. Because it is a manual reset device, it must be physically reset after tripping, which alerts the homeowner that an underlying problem needs attention. A switch that trips repeatedly or fails to reset should be replaced with the correct OEM part.
The genuine OEM Goodman switch is calibrated to the exact trip temperature engineered for this furnace's burner and heat-exchanger layout. Generic switches with the wrong setpoint can nuisance-trip or, worse, fail to protect the unit. For a safety device, always use OEM.
Easy (2/5). Shut off power and gas, note wire positions, disconnect the two spade terminals, unscrew the bracket, and install the replacement. Reset the new switch and confirm normal heat-cycle operation. Roughly 10–15 minutes.