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The Goodman 10123519 is a genuine OEM manual reset limit switch built as a direct-fit replacement for the Goodman AKSS921155DXAA gas furnace and compatible 115,000 BTU models. This safety control opens the electrical circuit and shuts down the furnace if it detects an overheat or flame-rollout condition, protecting the heat exchanger and surrounding components. Because it is a manual reset device, it must be physically reset with the button after a trip — a design that forces inspection of the underlying fault before the furnace can run again.
The genuine Goodman switch is calibrated to the furnace's factory trip temperature and uses the correct mounting bracket and terminal layout. Substituting a generic switch with a different trip point can either nuisance-trip or, worse, fail to protect against a genuine overheat. The OEM part guarantees the intended safety threshold.
Easy to Moderate. The switch mounts with screws and spade terminals, but because it is a safety component, repeated trips indicate a serious underlying issue (restricted airflow or heat-exchanger fault). Have a qualified technician diagnose before replacing. Always shut off gas and power first.