6BAR Wine Cooler - New Manuals & User Guides

We have a 6BAR Marvel refrigerator. Lately, no matter how low we turn the temperature down, it still maintains a very cold termperature and freezes water and sodas. In fact, a small can of coke exploded. Since it's in the basement underneath our bar, I can't say for sure if the compressor ever turns off, but it always seems to be running when I check it. I have turned it completely off. What to do? If this requires a part, is it something we can fix ourselves?