Sub-Zero Refrigerator Repair - Ice build up

If your Sub-Zero fridge has a build up on the back of the freezer, it is necessary to implement a couple of steps below. Unplug the fridge and let it defrost overnight. Then, measure the temperature (both freezer and fridge) for several days. If the ice build up returns and the temperature jumps back again, it’s obvious the fridge will need a more permanent fix. A common cause for ice buildup is a faulty door seal. If a refrigerator has a bad door seal, the outside air will pass into the fridge and cause the ice build up problem you are experiencing. Another cause for this could be that the door hinges are loose or not attached properly leading to outside air entering your fridge/freezer. Check to be sure the door hinges are tight and are attached and aligned properly. Some other simple things you can do to try and remedy this issue are easy to try yourself. You can try moving the refrigerator away from the wall a little bit more to give it extra room for the air to circulate. The heat from the compressor should have sufficient room to dissipate. If the refrigerator is too close to the wall problems will occur. Another solution may be to clean the vents on the back or below the fridge as they can be clogged with dust and debris. Clogged vents cause air circulation problems that lead to many common refrigerator problems. If the ice build up is only happening in the freezer, the freezer drain is probably clogged. To unclog the drain you should first unplug the unit from the wall. Remove the freezer covers to expose the frozen drain. Pour hot water down into the drain hole until you see the water dripping into the drain pan under the refrigerator.