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The Goodman 10123535 is a genuine OEM red-coded manual-reset high-limit / rollout safety switch, built as a direct-fit replacement for the GKS90704CXAA gas furnace. The red color code designates its specific trip temperature—do not substitute a differently coded switch. It opens the ignition circuit on an overheat or flame-rollout condition to protect the furnace and home, and requires a manual push to reset after a trip.
The color code on this switch corresponds to a precise trip point. Installing a generic or wrong-color switch changes the temperature at which the furnace shuts down, which can cause nuisance trips or defeat the protection entirely. The OEM 10123535 guarantees the correct threshold and exact mounting for this model.
Easy (2/5). Two spade terminals and one or two mounting screws. A repeated trip signals a root-cause issue such as restricted airflow or rollout—investigate before returning the furnace to service. Shut off power and gas before servicing.