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The Goodman 10123535 is a genuine OEM red-button manual reset limit switch designed for the GKS90703BXAE gas furnace and related Goodman/Amana 90-series units. This high-limit safety control opens the heating circuit when it senses an unsafe temperature at the heat exchanger or burner assembly, protecting the furnace and your home from overheating and flame rollout. The distinctive red reset button identifies its trip rating and location within the furnace's safety string, and it must be manually reset after a trip.
Because trip temperature is safety-critical, the genuine Goodman part is calibrated to the furnace's exact specification and drop-in mounting. Generic substitutes may not match the correct trip point implied by the red rating, risking nuisance trips or inadequate protection. OEM keeps the safety string intact and protects your warranty.
Easy (2/5). Cut power to the furnace, disconnect the two spade terminals, remove the mounting screws, and fit the new switch in the same orientation. If it trips again, address the root cause—restricted airflow, dirty filter, or a combustion fault—before returning the unit to service.
Always disconnect power before servicing your furnace.