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The Goodman 0130F00038 auxiliary limit switch (light blue) is a genuine OEM thermal safety control for the ACVC950714CXAC gas furnace and related models. This rollout/auxiliary high-limit switch monitors temperature at a critical point in the furnace and opens the circuit if it detects an overheat condition — protecting the heat exchanger and blower assembly from damage. A tripped or failed auxiliary limit will prevent the furnace from firing or cause it to shut down on a safety fault. Replacing it with the correct factory-rated switch restores safe, normal operation.
Limit switches are color-coded to a specific trip and reset temperature. The genuine light blue 0130F00038 guarantees the exact rating the furnace was engineered for. Installing a generic switch with the wrong temperature setpoint defeats the safety design — it can nuisance-trip or, worse, fail to open when it should. This is a safety component where OEM matching is essential.
Easy (DIY-friendly). Turn off gas and power, disconnect the two wire leads, remove the mounting screws, and install the new switch in the same orientation. About 15 minutes with a nut driver. Never substitute a different color/temperature rating — match 0130F00038 exactly.