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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM safety control for the Goodman GKS90453BXAB gas furnace and compatible GKS90-series models. The red-button manual reset switch is a normally-closed thermal cutout that opens the ignition/gas-valve circuit when it detects excessive temperature or flame rollout, protecting the furnace and home from overheating. Its trip point (denoted by the red button color used to distinguish switch ratings) targets a specific location on the burner or heat-exchanger assembly, differentiating it from companion limit switches.
Color coding on Goodman limit switches indicates a specific trip temperature — installing the wrong rating (or a generic equivalent) can cause premature lockouts or, worse, allow unsafe operation. The genuine 10123535 is calibrated to the exact set point engineered for this furnace, so it belongs in its designated position. Confirm you are replacing red with red.
Easy (1 of 5). Cut power to the furnace, transfer the spade wire terminals one at a time to avoid mixing them up, remove the mounting screws, and fit the new switch in the same orientation. About 10–15 minutes. Repeated tripping after replacement indicates an airflow or combustion fault that must be corrected.