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The Goodman 10123533 Manual Reset Rollout Limit Switch is a genuine OEM safety control engineered for the GKS90904CXAF gas furnace and compatible Goodman/Amana models. This normally-closed switch monitors the burner box for flame rollout — an unsafe condition where combustion escapes the heat exchanger — and instantly de-energizes the gas valve to protect the appliance and your home. Because it is a manual reset device, it trips permanently until pressed, forcing a technician to inspect the root cause before the furnace restarts.
Our OEM 10123533 matches the factory trip temperature and terminal geometry exactly, so it seats in the original bracket without modification and preserves the furnace's UL safety listing. Aftermarket generic switches often use approximate trip points that cause nuisance shutdowns or fail to trip at the correct temperature — a serious safety risk on a rollout control. For a component whose only job is protecting against fire, we strongly recommend the genuine part.
Easy (2/5) — Shut off gas and power, disconnect the two spade terminals, unbolt the switch, and reverse. Always diagnose why the original tripped (blocked flue, cracked heat exchanger, dirty burners) before returning the furnace to service. Professional inspection recommended.