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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for the ADSS800403AXAA gas furnace and compatible Goodman/Amana models. This normally-closed switch opens to shut off the burners if the heat exchanger overheats, then requires a manual reset to restore operation — a critical safety device that prevents overheating from a blocked filter, failed blower, or restricted airflow.
The OEM switch is calibrated to the exact trip and reset temperature specified for the ADSS800403AXAA heat exchanger. Generic switches may trip at the wrong setpoint, causing nuisance shutdowns or, worse, failing to protect the unit. For a safety-rated control, OEM is the responsible choice.
Easy to Moderate — Power off the furnace, disconnect the two spade terminals, unscrew the switch, and mount the replacement in the same orientation. Verify a repeated trip has an underlying cause (airflow) corrected. Typical service time: 15–20 minutes.