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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-temperature safety control engineered for the Goodman GKS90453BXAA gas furnace and other compatible GKS9-series models. This switch monitors heat-exchanger and plenum temperatures, interrupting the burner circuit if the furnace overheats — protecting your equipment and home from unsafe conditions. Because it is a manual reset style, the switch stays open after a trip until you physically press the reset button, giving you a clear signal that a limit event occurred and needs investigation.
Choosing the genuine Goodman part guarantees the exact trip temperature, mounting pattern, and terminal configuration specified by the manufacturer. Aftermarket limit switches often use approximate temperature ratings that can cause nuisance shutdowns or, worse, fail to trip at the correct threshold. For a safety-critical component, OEM is strongly recommended.
Easy (2/5). A qualified DIYer can typically replace this switch in 15–20 minutes with basic hand tools. Always disconnect power to the furnace before servicing. If the switch trips repeatedly after replacement, have a licensed HVAC technician diagnose the underlying cause (restricted airflow, dirty filter, or failed blower).