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The Goodman 10123533 is a genuine OEM manual reset high-limit switch for the GKS90453BXAC furnace. This safety control monitors temperature and cuts power to the gas valve if the furnace overheats — for example due to a blocked filter, failed blower, or restricted airflow. Because it is a manual reset design, it must be pressed to restore operation after a trip, prompting the homeowner to address the underlying fault.
Limit switches are calibrated to a specific temperature trip point. The OEM 10123533 is set to Goodman's factory spec for your model, ensuring the furnace shuts down at exactly the right temperature. Generic switches with incorrect trip points can either nuisance-trip or, worse, fail to protect against a genuine overheat. For a safety control, only genuine OEM is appropriate.
Easy (2/5). Cut power, note wiring, unscrew the old switch, mount the new one in the same orientation, and reconnect the leads. Roughly 15–20 minutes; a technician is advised if you're unsure about wiring safety components.