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The Goodman 10123535 is a genuine OEM red-button manual-reset high-limit switch for the GMH950453BXAA gas furnace. The red reset button denotes a distinct trip-temperature calibration from similar switches (such as the 10123533), so matching the exact part number is essential. It opens the gas circuit on an over-temperature condition to protect the heat exchanger from airflow-restriction overheating.
The red 10123535 is factory-calibrated to a specific setpoint identified by its color code. Substituting the wrong switch — even a physically identical one — risks incorrect trip behavior. The genuine OEM part removes that guesswork and guarantees the proper cutout temperature.
Easy — Cut power, remove the two mounting screws, move the spade connectors to the new switch, and secure it flush against the heat exchanger. Always correct any underlying airflow restriction before returning the furnace to service.