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The Goodman 10123519 is a genuine OEM manual reset limit switch (flame rollout / high-limit safety control) engineered as the exact-fit factory replacement for the GMH951155DXAB 95% AFUE gas furnace. This normally-closed thermal safety switch opens and cuts power to the gas valve if it senses flame rollout or excessive heat, protecting the furnace and home from overheating. After a fault it must be manually reset once the underlying cause is corrected.
This is a genuine OEM Goodman safety control calibrated to the exact trip temperature your furnace requires. Generic limit switches with the wrong temperature rating either nuisance-trip or, worse, fail to open when they should — defeating a critical safety function. Match the OEM part number exactly for any high-limit or rollout switch.
Moderate (2/5). Disconnect power to the furnace, note and remove the two spade wire connectors, and unscrew the switch from the burner box or heat-exchanger bracket. Mount the new switch, reconnect the wires, and press the reset button. Because a tripped rollout switch signals a real problem (blocked flue, cracked heat exchanger, dirty burners), have a technician diagnose the root cause before returning the furnace to service.