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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue body) is a genuine OEM secondary safety control for the VMES960403ANAA gas furnace. Mounted near the blower or burner compartment, this auto-reset thermal switch opens if it detects an abnormal temperature rise — for example from restricted airflow or a blower failure — shutting the furnace down before damage or an unsafe condition occurs.
Goodman color-codes these auxiliary limits by trip temperature, and the light-blue 0130F00038 is matched to your furnace's spec. Installing a generic or wrong-color limit changes the trip point and defeats the safety design. Always match the OEM part number and color for limit controls.
Easy. Disconnect power, pull the two spade terminals, remove the mounting screws, and fit the replacement in the same location and orientation. Typically a 10–15 minute repair.