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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is the genuine OEM manual/auto-reset overheat safety for the Goodman/Amana AMH80703AXCB furnace. Mounted near the blower or heat exchanger, it opens the control circuit if temperatures climb past its rated trip point — typically caused by a dirty filter, blocked ductwork, or a failing blower — protecting the heat exchanger and cabinet from heat damage.
The color code corresponds to a specific trip and reset temperature calibrated to this furnace. Installing the wrong-rated generic switch can cause nuisance trips or, worse, fail to protect the equipment. OEM guarantees the exact temperature spec and bracket fit.
Easy to Moderate. Disconnect power, remove two mounting screws and the spade terminals, and install the replacement. Diagnosis matters — a tripped auxiliary limit usually signals an airflow problem that should be corrected too.