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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the AMES800603AXAA gas furnace. This normally-closed thermal switch opens the ignition/gas circuit when it senses excessive temperature — typically from flame rollout or a blocked heat exchanger — and must be manually reset after tripping. Its deliberate manual-reset design ensures a technician inspects the cause before the furnace can fire again, protecting the equipment and the home.
The genuine OEM switch is calibrated to the exact trip temperature specified for this furnace's safety circuit. Generic switches with different setpoints can nuisance-trip or, worse, fail to trip when needed. For a safety-critical control, OEM calibration is the correct choice — never substitute a mismatched temperature rating.
Easy to Moderate — two mounting screws and two spade terminals. 15–20 minutes. If a switch has tripped, diagnose and correct the root cause (rollout, restricted airflow, cracked heat exchanger) before returning the furnace to service.