open a window and let the warm air out to stop in hitting the cold front of the fridge door and turning to condensation that then will drip onto the tiles
I have a ceramic tiled floor and an upright freezer but I don't get any condensation underneath it or anywhere near it - are you sure you don't have a little leak instead ? You might wish to repost your Q in the Home & Garden section - there are some very knowledgeable folk over there !