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The Goodman 10123533 is a genuine OEM manual-reset high-limit / rollout safety switch and a direct-fit replacement for the GKS90704CXAA gas furnace. This switch opens the ignition circuit if it senses excessive temperature or flame rollout, shutting the furnace down to prevent damage and hazard. Because it is manual-reset, it must be physically pressed to restore operation after a trip—an intentional design that flags a condition worth inspecting.
Limit switches are trip-temperature specific. The OEM 10123533 is set to the exact threshold and mounting footprint Goodman specified for this furnace, so it protects at the correct temperature. A generic switch with a different trip point can either nuisance-trip or, dangerously, fail to open when it should. For a safety device, OEM is strongly recommended.
Easy (2/5). Two quick-connect terminals and one or two mounting screws. Note that a tripped limit usually points to an underlying issue (blocked airflow, dirty filter, or rollout)—diagnose the cause, don't just reset. Shut off power and gas before servicing.