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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary over-temperature safety control for the ACEC960603BNAB gas furnace and compatible Goodman/Amana units. Mounted near the blower or burner area, this auto-reset switch opens the control circuit if airflow is lost or temperatures climb beyond the safe range, backing up the primary limit.
The light-blue color denotes a specific trip temperature. Installing a generic switch with a different set point defeats the layered safety design of the furnace. The OEM 0130F00038 guarantees the correct rating, bracket, and terminals for a true plug-in replacement.
Easy (2/5). Two screws and two wires, usually under 15 minutes. De-energize the furnace first and verify the color/set point matches the original.