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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Goodman VMS80604BNAA gas furnace. This auxiliary limit backs up the primary high-limit, monitoring a specific hot zone — such as the blower compartment or burner box — and interrupting the gas valve if temperatures exceed its rated setpoint. The light-blue body color identifies its factory trip temperature, so matching the correct color-coded switch is essential for proper protection.
This genuine Goodman OEM auxiliary limit is calibrated to the exact temperature indicated by its light-blue coding. Substituting a switch with the wrong setpoint can defeat the safety function or cause nuisance trips. Because it is a safety component, always match OEM part number and color.
Power off the furnace, note the wire positions, remove the mounting screws, and install the identical light-blue replacement in the same location and orientation. A quick continuity test confirms diagnosis. Most repairs take 15–20 minutes with basic hand tools.