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The Goodman 10123533 is a genuine manual reset high-limit switch engineered for the GKS90904CXAC gas furnace. This temperature-sensing safety control monitors heat exchanger and plenum temperatures and cuts power to the gas valve if the furnace overheats — protecting against fire and heat-exchanger damage. Unlike auto-reset limits, the manual reset design requires a physical button press to restore operation after a trip, ensuring an overheat condition is investigated before the furnace runs again. A failed or nuisance-tripping limit switch causes no-heat calls and intermittent shutdowns.
The OEM 10123533 is calibrated to the exact trip temperature specified for your furnace model, so it protects without nuisance tripping. Generic limit switches with incorrect temperature ratings can trip early (short cycling) or too late (defeating the safety function). For a safety-critical control, the OEM part is strongly recommended.
Moderate — About 20–30 minutes. Turn off power and gas, remove the two mounting screws and disconnect the wiring from the old switch, then mount the new limit and reconnect the leads. Because this is a safety control, verify correct operation and trip response; professional installation is recommended.