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The Goodman 0130F00038 is a genuine OEM auxiliary (secondary) limit switch, identified by its light-blue housing that denotes its specific trip temperature. It provides backup over-temperature protection — commonly for the blower compartment or a secondary section of the heat exchanger — cutting the control circuit if that zone overheats. It is a direct-fit replacement for the AMSS960803BNAA and related Goodman/Amana 96% AFUE furnaces.
The light-blue color code corresponds to a precise factory trip temperature. Installing a switch with a different setpoint — even one that physically fits — can cause nuisance shutdowns or defeat the intended protection. Match the OEM part and color to keep factory safety margins.
Easy–Moderate (2/5) — disconnect power, unplug the spade terminals, remove the mounting screws, and install the matching light-blue OEM switch. 10–15 minutes; confirm continuity with a meter before restoring power.