Hi,Welcome to Just Answer, My name isXXXXX will be helping you with your appliance issue today.
this is frozen down in the tube itself. Ihe best way to clear that is buy boiling water and pour it down the tube then using and turkey baster suck it out when it colls and do it again until the ice clears from the drain, you will never push the ice out with a snake, you have to melt it. this may take a while but should clear it out, make sure the water is real hot and when it cools suck it out and do it again. hope this helps. thanks Bryan