If there's ice blocking the drain hole then before it became ice it must have been water - but it didn't drain out of the drain hole - so the drain hole must be blocked.
If there's ice in the Fridge something must be working but you do not say what's wrong - only that the drain hole had ice in it.
If there's a fan then it will be driven by a motor - all the fan can do is circulate the air in the fridge. It's not an essential item.
You can get spares from several on-line domestic appliance stores - e-spares comes to mind - also a-part-4-u
Good Luck..., September 2015
