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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch, identified by its light blue body, designed for the VCSS961005CNAA 96% AFUE two-stage furnace. This secondary temperature safety monitors a specific zone of the furnace — typically the blower compartment or coil area — and opens the control circuit if temperatures exceed the safe threshold, backing up the primary limit. If your furnace trips on limit or won't heat and the primary switch tests good, the auxiliary limit is a common culprit.
The OEM Goodman auxiliary limit is color-coded and factory-calibrated to the precise trip point Goodman specified for this location. The light-blue color designates its rating — substituting a generic switch of the wrong temperature can compromise the furnace's layered safety design. Use OEM for safety controls.
Easy to Moderate — disconnect power, unplug the two spade terminals, remove the mounting screws, and install the matching light-blue replacement. Confirm proper heating operation afterward.