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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for ACEC800805CXAA gas furnaces. This high-limit/rollout switch opens the circuit and shuts off the burners if it senses excessive temperature, protecting the heat exchanger and home from overheating. Because it's a manual-reset type, it must be physically reset after a trip — and a switch that trips repeatedly signals an underlying airflow or combustion problem to investigate.
The genuine OEM switch is calibrated to the furnace's exact trip temperature — a safety-critical spec. Generic switches with the wrong setpoint can nuisance-trip or fail to protect the unit. For any safety control, always use the OEM-rated part.
Easy (2/5). Disconnect power, unplug the two terminals, unscrew the old switch, and mount the replacement. Roughly 15 minutes with a nut driver. Diagnose why it tripped before returning the furnace to service.