Ice in bottom of fridge

Actually, the drain is perfectly clear.
I was thinking that the defroster was not working, but it seems to be cycling maybe every 8 or 10 hours.
the ice buildup is on the fridge size not the freezer side. I lowered the temp on the fridge size and closed the crisper slot that goes to the freezer.  now, no ice but there is water down there.
Help?

Ok Your defrost drain is frozen or has algae blocking it it’s at the back of the freezer behind the evaporator cover. You can see it without removing the evaporator cover. You might or might not see the drain hole because of the ice now you can sit and poor hot water on it till it thaws then get a thin wire and run down the tube till its clear or sit there with a hair drier and thaw it .But if you don't mind a small investment ill tell you the best way to deal with it .Go to Lowe's or some where like that and buy you a eureka model 350 hand held steamer. Trust me it will be one of the best investments you'll ever make. You will find 1001 uses for it besides this and the steam will not damage your refrigerator and all the attachments make it very useful. Remove the evaporator cover and take the steamer and melt the ice under the evaporator where the drain pan is. Then you will see the drain hole. Put the curved tip on the steamer an start clearing the drain hole now when you get it melted enough to where the curved tip makes a seal around the drain hole let the steam build then hold down the trigger till you hear it at the back of the refrigerator and your done put the evaporator cover back on then think of all the other uses for that steamer now I told whirlpool about it they tested it and now have it posted on their web site