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The Goodman 0130F00038 is a genuine OEM auxiliary (rollout/high) limit switch, identified by its light blue trip-rating dot, designed for the VMSS960804CNAA gas furnace. This normally-closed thermal safety switch monitors temperature in the blower or burner compartment and opens the control circuit if it detects an unsafe overheat condition — protecting the heat exchanger and preventing a fire hazard. If your furnace trips on limit or the blower runs continuously, a failed or drifted auxiliary limit is a frequent culprit.
The light-blue color denotes a specific factory-calibrated trip temperature — matching it is critical for safe operation. Genuine OEM guarantees the correct set point and disc geometry. Generic switches may carry an incorrect trip rating, causing either nuisance shutdowns or, worse, failure to protect against overheating. Always match the exact color code.
Easy (1/5) — Two mounting screws and two spade terminals. Cut power, transfer wires one at a time, and reinstall. About 10 minutes.