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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM high-temperature safety limit for the AMEH960805CXAA gas furnace. This normally-closed switch opens the control circuit if it senses an over-temperature or flame-rollout condition, shutting down the burners to prevent heat-exchanger damage or fire. Because it is a manual-reset device, it must be physically reset with the button after tripping — a tripped switch signals an underlying issue (blocked airflow, dirty filter, cracked heat exchanger) that should be diagnosed.
The OEM 10123517 is factory-calibrated to the exact trip temperature specified for this furnace. Substituting a generic switch with a different setpoint can either nuisance-trip or, worse, fail to protect against a genuine over-temp event. For a safety-critical component, OEM calibration is non-negotiable.
Easy — Usually two mounting screws and two spade terminals. Shut off power, note wire positions, swap, and reset. That said, always determine why the original switch tripped before returning the furnace to service.