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The genuine Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a factory OEM safety control for the Amana/Goodman AMVM970803BNBA modulating gas furnace. This thermally activated switch monitors temperature at its mounting location and opens the circuit if the furnace overheats — protecting the heat exchanger, blower housing, and surrounding components from heat damage. The color code identifies its specific trip set point within the AMVM97 platform.
OEM vs. Generic: Limit switches are matched to a furnace by their exact trip temperature and reset differential — that is why Goodman color-codes them. Installing the correct light-blue OEM 0130F00038 ensures the furnace trips at the engineered temperature. A generic or wrong-temperature switch can either nuisance-trip (no heat) or fail to protect the unit, which is a genuine safety risk. Always match the color code.
Installation Difficulty: Easy (DIY-friendly). Disconnect power, remove the two mounting screws, transfer the wire terminals to the new switch, and reinstall in the same orientation. Takes about 10 minutes. Verify the replacement's color code matches before installing, and never bypass a limit switch.