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The Goodman 10123535 Red Manual Reset Limit Switch is a genuine OEM high-limit safety control for the AMH950703BXAG gas furnace. The red button identifies its specific trip-temperature calibration. Like all manual-reset limits, it opens the burner circuit on an overheat condition and stays open until manually reset, protecting the heat exchanger and forcing inspection of the root cause before the furnace can run again.
The color coding on the 10123535 corresponds to a precise trip temperature — installing the wrong switch, even one that looks similar, can leave the furnace under- or over-protected. The genuine OEM part guarantees the correct calibration and terminal layout, so it drops in and performs exactly as Goodman intended. Never substitute a different limit switch by appearance alone.
Moderate (2/5). Cut power to the furnace, photograph the wiring, remove the old switch from its bracket, and mount the OEM replacement in the same position with matching connections. Diagnose and clear the overheat cause — typically restricted airflow or a dirty filter — before resetting and restoring power.