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The Goodman 0130F00038 auxiliary limit switch (identified by its light-blue body color code) is a genuine OEM safety control for the ACVC800603BXAB gas furnace. This high-limit switch monitors temperature at a secondary location in the furnace cabinet and opens the circuit if it detects an overheat condition, protecting the heat exchanger and surrounding components from heat damage. A failed or out-of-spec limit switch can cause nuisance no-heat lockouts or, if bypassed, allow unsafe operation.
The color code is critical — Goodman limit switches use body color to indicate the exact trip temperature. Installing a generic switch with the wrong rating defeats the engineered safety margin. This genuine OEM unit guarantees the correct temperature setpoint and connector style for your furnace.
Easy — mounts with two screws and uses spade wire terminals. Disconnect power before servicing and verify the correct color code matches the original. Estimated time: 10–20 minutes.