Check the drain tube in the refrigerator first, which is usually located on the refrigerator floor, sometimes under the crispers, or in the wall. Look for the freezer drain tube if the refrigerator drain is clear. The freezer drain tube, which is also usually on the wall or on the freezer floor.
Look for a round hole or tube to locate the drain tube or a small plastic cover held in by two screws. Remove the screws and lift off the cover to access the drain tube.
Use a hair dryer to melt the ice if the drain tube is iced over, being careful not to apply the heat to other components in the refrigerator or freezer. Pour hot water on the ice if you prefer not to use a hair dryer and mop the water up with a towel until the ice begins to melt. Clean up the melted ice over the drain tube with a towel to avoid water sitting on the floor of the refrigerator or freezer.
Combine hot water and baking soda to create a drain solution and use a basting syringe to send the mixture down the clogged drain tube. If the clog does not start to dissolve, use a straw to gently push the clog through the drain and into the drain pan below.
Keep flushing the drain with the baking soda mixture until the mixture is running freely down the drain tube. Replace the cover over the drain if applicable.
Lift off the toe grille on the refrigerator and disconnecting power. Look at the drain pan, which can be removed from some refrigerators. If possible, take out the drain pan and empty the pan out in a sink. If the pan cannot be removed but is overflowing or the pan seems to be damaged or cracked, contact your refrigerator manufacturer for assistance.