There are several steps you can take if your refrigerator is running but not cooling, before you should deem it broken. First, you should make sure the temperature is set properly, and the controls weren't accidentally bumped at any time. Then, you should make sure the condenser coils are clean and that there is no items blocking the air's path. On the contrary, if your fridge isn't filled enough, then it may be having a hard time keeping cool because the air is flowing too freely. For more, you can check out our ultimate refrigerator repair guide.