Turn off the water supply to your refrigerator's ice maker. Access the pipes and tubes beneath your kitchen sink or whatever water supply you have connected to the refrigerator. Look for the copper line that comes from the refrigerator and find the valve where it connects to the piping. Turn the valve clockwise until it won't turn anymore, to shut off the water.
Lean into the freezer and look behind the ice maker. You may need to remove the shelves and food from the freezer to access the back of the ice maker.
Tug gently on the tubing that comes from the back of the ice maker. If the tubing connections move, tighten the connections by turning the connectors clockwise with a wrench.
Inspect the tubing for any holes or cuts. If the line has a hole or opening in it, ice will more than likely be formed at that location on the tubing. If the tubing does have a hole, order a new part from the manufacturer of the refrigerator and replace the tubing.
Bottom of Freezer or Refrigerator
Locate the top of the defrost drain system in the freezer. Generally, this system begins in the bottom center of the freezer and consists of a defrost unit inserted into a cup-like piece.
Place a stopper in your kitchen sink and run hot water, too hot to touch, in the sink. If the water in your sink can't get that hot, heat water in a pan on the stove until it's almost boiling.
Dip the tip of a baster into the hot water and squeeze the bulb to fill the baster with water. Insert the tip of the baster into the cup-like piece in the back of the freezer and squeeze the bulb to force the water down into the tube of the defrost drain system. You may have to maneuver the tip of the baster in around the rest of the defrost unit to get it into the cup.
Wait for a few minutes and if the water didn't come back up, repeat the process. This forces any clogs through the tube, allowing the water to flow freely again, which should stop freezer and refrigerator leaks.