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The Goodman 10123533 is a genuine OEM manual-reset high-limit safety switch designed for the GKS91155DXAE gas furnace. Like its companion limit controls, it protects the appliance by opening the control circuit on an overtemperature or flame-rollout event, forcing a shutdown until the condition is cleared and the button is manually reset. This 10123533 is calibrated to a different trip point/location than the 10123519, so match the exact part number your furnace calls for.
The OEM Goodman 10123533 carries the precise open temperature engineered for this furnace. Substituting a generic switch of an unknown setpoint risks either nuisance lockouts or a failure to protect the heat exchanger. For safety controls, OEM is the responsible choice.
Easy (2/5) — Power off, transfer the two spade wires, remove/replace the two screws, and press the reset button. Roughly 10 minutes with a nut driver. Investigate any repeat trips before returning the unit to service.