A correct model number would be helpful, but sounds like your defrost drain is plugged. Guessing this is a side by side, look at the lower rear panel on the freezer side and you may find there is a block of ice back there. The drain is entombed in the ice so every time the refrigerator goes into defrost, the water cannot drain and thus ends up in the bottom of the freezer. Carefully chip out as much as you can and use hot water and towels to melt the rest. Once the ice if gone, you should be able to find the drain (you may need to remove the rear panel for a better look) and poor hot water down the drain. It is also helpful to fish something down the tube to push through whatever may have started the draining problem. Once water runs smoothly down the drain and into the condensate pan underneath, you can dry everything off and put it back together.

That drain runs to the condensate pan under the refrigerator. Depending on the model, that drain can be a foot or more in length so you need to snake the tube with something that will not damage the tube and also be flexible enough to make any bends in the line. I use 1/4" water line and show it all the way down until I see it come out into the pan below. If you snake the drain, you will probably find it's still frozen and needs to be cleaned out.

I use a turkey baster to force boiling water down the drain. If this fails, you will have to check the other end of the drain for blockage.

This is pretty much my problem... Mod 550. How do I thaw and keep thawed the condensate drain?

Where in the freezer does the drain line end?

TIA

Stephen

Yes, your advice was very helpful! Things are fine now and I really appreciate everyone!