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The Goodman 10123517 is the genuine OEM manual-reset high-limit safety switch used on GMH950905CXAB 95% AFUE gas furnaces. This normally-closed thermal switch opens the 24V control circuit if it senses an overheat or flame-rollout condition, shutting the furnace down to protect the heat exchanger. Because it is a manual-reset device, it must be pressed to close again after a trip — a repeat trip signals an airflow or combustion problem that should be diagnosed, not bypassed.
The genuine OEM switch is calibrated to the exact trip temperature Goodman engineered for this heat exchanger. Generic limit switches may carry a different set point, tripping too early (nuisance lockouts) or too late (a real safety risk). On a flame-safety component, the OEM part is the right call every time.
Easy (2/5). Cut power to the furnace, note the two wire locations, unscrew the old switch from the burner box or heat-exchanger bracket, mount the replacement, and reconnect the spade terminals. Press the reset button before restoring power.