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The Goodman 10123533 is a genuine OEM manual-reset high-limit safety switch for GKS90703BXAG and compatible Goodman/Amana gas furnaces. It monitors temperature at the heat exchanger or burner area and opens the circuit to shut off the gas valve if the furnace overheats — protecting against restricted airflow, a failed blower, or flame rollout. Because it is a manual-reset device, it must be physically reset after a trip, prompting the homeowner or technician to find and fix the underlying cause.
Limit switches are matched to a specific trip temperature and mounting footprint. The genuine OEM 10123533 carries Goodman's factory temperature calibration and bolt pattern, so it protects at the correct threshold and seats cleanly. Generic replacements with a different set point can trip early (nuisance shutdowns) or late (defeating the safety margin). For a critical safety control, use the OEM part.
Easy (2 of 5). Roughly 15–20 minutes. Shut off gas and power, remove the mounting screws, transfer the wiring one lead at a time, secure the new switch, and press the reset button. If the switch keeps tripping after replacement, stop and have a technician diagnose airflow or a cracked heat exchanger before running the furnace.