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The Goodman 10123535 is a red-button manual-reset high-limit / rollout safety switch for the GME950603BXAB 96% AFUE gas furnace. Like its companion switch, it is a normally-closed thermal cutoff that opens the ignition circuit on an over-temperature or flame-rollout event. The red button denotes its specific trip-temperature calibration — be sure to match the exact part number, as the different-colored switches on this furnace are NOT interchangeable.
Because trip temperature is safety-critical and this switch is color-coded to a specific rating, only the genuine 10123535 guarantees correct protection. Generic substitutes or the wrong-color switch can nuisance-trip or fail to cut off during a true overheat. OEM is the only safe choice here.
Easy. De-energize the furnace, remove the two spade connectors and mounting screws, and fit the new red-button switch in the original position. Confirm the correct part number against your unit and diagnose the root cause of any trip before restoring power.