On models that provide it, super cooling temporarily increases cooling for a stated purpose such as a substantial new load. It is not a universal repair mode.
What the observation tells you
Its duration, effect and cancellation method vary. A lit indicator may explain a change in running sound or an unusually cold result, but it does not prove that a separate fault has disappeared. Do not leave it selected indefinitely unless the instructions permit that operation.
A useful next step
Read the exact function description before use. Record whether it was active when the problem appeared and return to the recommended normal setting as directed.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.