If the block of ice is inside the fridge below the level of the gutter then it is the hole that is getting blocked up. What happens is that the moisture in the air condenses on the gutter, and it should escape from the fridge via the hole.If the hole gets blocked, the condensed water has nowhere to escape, and the gutter fills up, and as soon as the gutter starts overflowing, the water coming out of the gutter touches the really cold back wall of the fridge and freezes. It's a very slow process, not like a leaking tap, but gradually, over the course of a few days, you'll see the ice building up.Everytime you open the fridge door you let in air that has moisture in it. If you have tiny blobs of ice, these are fine, and the warmer air coming in when you open the frige will cause these to melt, but if you have a big block of ice, the hole is blocked.
Andrew Jones ● 1519d