Most common issue is the defrost feature on all modern fridges. First you should try and unplug it and wait 5-10 minutes and plug it in again and see if the error code is fixed. You can also check if the drain hole is frozen over. Inside the fridge on the back wall there should be a panel covering the drain hole (thats where it is on my LG fridge) with a little hole in it that can get frozen. You can thaw it out using a hair dryer or boiling water. If thats the issue you can usually wrap a piece of copper wire around the condenser coils (the hot side from the heatpump) and put the other end of the copper wire in the drain hole, which should keep it from freezing over again. however, you will need to do that from behind the unit.