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The Goodman 0130F00038 is a genuine OEM auxiliary high-limit switch, identified by its light blue housing, designed for the AMSS921005CNAB gas furnace and compatible Goodman and Amana models. Mounted near the blower or heat exchanger, this auto-reset thermal switch opens if the cabinet temperature climbs above its rated set point — for example during a blower failure or severely restricted airflow — and closes again once conditions return to normal. It provides an extra layer of overheat protection alongside the primary limit control.
Goodman color-codes these switches to their trip temperature, and the light blue 0130F00038 is factory-matched to this furnace. A generic switch with the wrong set point can cause nuisance shutdowns or fail to protect the heat exchanger. For a safety limit, OEM is the right call.
Install difficulty: Easy (⭐⭐☆☆☆). Power down the furnace, unplug the two spade terminals, remove the mounting screws, and install the replacement — usually 10-15 minutes.