Refrigerators are meant to keep your food cold, not wet. Unfortunately, this appliance commonly can accomplish both at the same time --- whether you like it or not. If you find that the inside of your refrigerator's fresh food compartment has sweaty, cold walls or is accumulating puddles of water on the shelves, on the floor of the compartment or in the vegetable drawers, you have an underlying problem that needs to be addressed.
Frozen Freezer Drain
When your refrigerator cools, the condenser coils in the freezer compartment can begin to accumulate frost. As part of the normal operation of a frost-free refrigerator, a heater will come on intermittently and thaw the frost to keep it from icing up and preventing proper cooling. The water from the thawed frost drips into a drain in the bottom of the freezer. If it freezes over and will not allow the water to drain through the proper channels, the water will spill over into the lower compartment in the refrigerator. The water will typically run down the walls of the refrigerator and may pool in the vegetable drawer or on shelves below. Cleaning out the blockage by defrosting the freezer will solve the problem.
When the water from the automatic defrost sends water through the drain in the freezer, the water goes into a receptacle where it is funnelled into a drain line that carries the water to an evaporator pan in the bottom of the unit. There the heat from the coils on the outside of the refrigerator causes the water to evaporate. But this receptacle and line can also become frozen or clogged with food particles that may have fallen through the drain. If the water cannot flow freely through the line, it will spill over into the lower compartment as well, causing the same wet problem as the clogged drain would. Cleaning out the clog in the line will fix the problem. Defrosting can also be a solution. However, if the freezing problem persists, there is likely a more serious problem with the machine, and a technician will be required to diagnose it.
If you are not finding pools of water but are more concerned with the inside of the refrigerator sweating, your problem is likely with the door gaskets. If the door gaskets on your refrigerator are torn, cracked, dried out or otherwise damaged, condensation can build up on the inside walls of the refrigerator. Damaged gaskets can also lead to increased condensation in the freezer section, which will lead to icing and additional problems. Replacing the worn-out gaskets is the easiest solution to the problem, and in some cases the gaskets simply need to be cleaned. Debris and dirt can cause gaskets not to seal properly as well. A simple wipe down may be all that is needed for a solution to the wet interior.
Sometimes the most obvious things are the ones you'll overlook time and again. Think about what is stored in your refrigerator and what it is stored in. If you keep a water container in the fridge for drinking, the tap on the container could possibly be faulty and will let water leak out. See whether any containers could be leaking water inside the refrigerator, and examine each one thoroughly. If you have an automatic water dispenser, inspect the supply lines for leaks.