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The Goodman 10123533 is an OEM manual-reset high-limit safety switch built for the WGFM195090S5DAC gas furnace. It monitors heat exchanger and cabinet temperature and opens the control circuit if the furnace overheats — a critical safety cutout that prevents damage from restricted airflow, a failed blower, or a blocked flue. Because it is manual-reset, it stays open after a fault until an operator presses the button, which flags that the underlying condition should be investigated.
This genuine Goodman switch is calibrated to the exact trip temperature and mounting footprint specified for your furnace. Generic limit switches with different set points or terminal layouts can nuisance-trip or, worse, fail to protect the heat exchanger. On a safety device, the OEM part is the right call.
Easy to Moderate — Power off the furnace, disconnect the two spade terminals, unscrew the switch, and reinstall the replacement in the same orientation. If the switch has been tripping, diagnose the airflow or venting cause before returning the unit to service.