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The Goodman 10123535 Manual Reset Limit Switch (Red) is the genuine OEM high-limit safety control for the AMH950703BXAF gas furnace. The red button designates a specific trip-temperature calibration used at its mounting location in the burner/heat-exchanger area. Like all manual-reset limits, it opens the burner circuit on an overheat or rollout event and stays open until the button is pressed, forcing a service check rather than an automatic restart.
Color coding matters here: the red OEM switch carries a different trip point than the standard version (part 10123533), and swapping the two — or substituting a generic — can defeat the intended protection. Always match the OEM part number and color to the position you are replacing. This is a genuine Goodman/Amana component built to the factory set point.
Easy (approx. 10–15 minutes). Kill power to the furnace, unplug the spade terminals, unscrew and remove the old switch, then mount the new red switch in the same orientation and reconnect. Reset and verify. Repeated tripping points to an airflow or venting fault that should be corrected before resetting again.