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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety cutout for the WGFM28115V5CXAB gas furnace. Unlike auto-reset limits, this switch latches open when an overtemperature or flame-rollout condition is detected and must be manually reset with the push button — forcing an inspection before the furnace can restart, exactly as the safety design intends.
OEM vs. Generic: The genuine Goodman switch is calibrated to the precise trip temperature and mounting footprint required for your furnace. A generic limit with the wrong setpoint or bracket can nuisance-trip, fail to protect against rollout, or sit at the wrong sensing point. Because this is a life-safety control, the OEM part is the recommended and correct choice.
Install difficulty: Easy (1/5). With power and gas off, unplug the spade terminals, remove the mounting screws, and install the new switch in the same orientation. Reconnect, restore power, and press the reset button. If the switch trips again after reset, do not bypass it — investigate airflow, burner, or heat-exchanger issues first.