That happened to us on our freezer side by side. Pull out whatever is in the bottom of your freezer, a shelf or a basket. Look on the floor of the freezer toward the back. You should see a small dime or nickle sized hole that may be covered in ice. It should have a cover on it with small holes. Check that nothing is blocking that hole. Something has probably fallen on top of it and has blocked its ability to drain thru the hole into the drain pan under the fridge when the defrost cycle comes on and the melted ice can't drain down properly. We used a hair dryer on low to carefully melt the ice that had formed on the bottom to find the drain. Sure enough a small piece of plastic wrap was blocking it. We removed the plastic and continued with the hair dryer til we could pour water in the hole and it flowed freely to the drain pan and didn't continue to back up into the freezer floor.. Be very careful with the hair dryer, put it on lowest setting and keep it moving back and forth, don't hold in one place, or it could melt or warp the plastic sides of the fridge. When the hair dryer is on low, put your hand about a foot in front of it and it should feel warm not hot. Move your hand forward til you feel the air is just warm, this is the distance you want to keep it from the ice you are melting. As the ice melts use a small towel to mop up the melted ice as you go. Good luck
Sounds like the drain for the defrost system is plugged....
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