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The Goodman 10123533 is the OEM manual reset high-limit switch for the GKS90703BXAB gas furnace. This safety control monitors heat exchanger temperature and opens the circuit to shut down the burners if the furnace overheats — protecting against blocked airflow, a failed blower, or a dirty filter. Unlike auto-reset limits, the manual reset design requires a technician to press the reset button, forcing the underlying fault to be diagnosed before the furnace runs again.
The OEM Goodman switch is calibrated to the exact factory trip temperature and mounting footprint, ensuring it protects the heat exchanger at the correct threshold. A generic limit may trip at the wrong temperature or fit poorly, either nuisance-tripping or failing to protect the unit. On a safety control, OEM calibration is essential.
Moderate (3 of 5). Turn off gas and power, remove the two mounting screws and spade terminals, and install the new switch. If the limit had tripped, always identify and correct the overheating cause (airflow, filter, blower) before returning the furnace to service.