The inside of freezer is leaking from back wall - there is no ice maker. water that leaks is freezing and taking up space. what can be causing this

are u sure its a water leak and not just a bad defrost terminator problem freezing everything, or a bad heating element causing freezing? the only other thing that will cause water leak is if u have ice maker with a bad hose seeping water out?

It's probably not the ice-maker. It has a plugged drain. This is located in the back wall of the freezer near the bottom. remove the evaporator cover...(the back wall of the freezer). Below the coils is a trough with a hole in it where the defrost water drains. This is probably frozen over.
Pour some hot water in to trough until you see drain hole. Keep pouring until water runs thru drain. May have to shut down ref to get it to defrost.

OK, first there is only two ways water can be entering the fridge under any circumstances, one is through the Ice Maker feed line coming from your wall to the back of the fridge and into the ice maker. The other is from the ice trays themselves leaking or overflowing or the filter itself is leaking. Look at the side walls of your refrigerator, are there water streaks running down the side? Have you reset the ice maker since you did your repairs? Have you replaced the filter lately?

Usual Causes

If the water pressure is too high, the ice tray can over fill or water can splash out. You can turn the supply shutoff valve to reduce the water flow. See the diagram below. If the ice cube tray has residual pieces of ice in the bottom, remove the pieces by pressing the reset button. You may have to do this several times to clear all the ice out of the tray.

Get back to me and I know you provided a lot of information, but this is a inline water issue relating to the ice maker and not really thinking it could be anything else. So if you can give me more information about the form in which this happens, such as you find the water after the trays are filled or if this is a constant but minimal flow, large flow, we can concentrate our plan towards this are of the repairs and diagnosis. Look forward to hearing from you soon.

I see you said you looked and the water valve is off but the only that I know of this happening is a defective water control valve. Like a dripping faucet that when off slowly drips until the ice forms and then one the ice maker dumps ice and tries to refill the water goes in every direction. Unplug water valve to confirm what I am saying, Tell me if it continues to leak. Sea Breeze

If you are sure that it's coming from the ice maker I believe that you possibly have a leaking water control valve on the side for the ice maker on the rear of refrigerator near floor there is a dual water valve control. Many times when this happens the water will freeze in the fill tube that fills the ice maker in the rear of freezer. You can defrost the frozen water in the fill tube with a hair dryer but that will not stop the problem from coming back. When that happens water tends to at times go everywhere but the ice maker. You can test the water control valve several ways. By unplugging the side to the ice maker and if water continues to flow slowly to the ice maker then the dual water control valve will need replaced, Sea Breeze

Look for bad door gaskets. Stick a dollar bill in the door and close it, It should be hard to get that dollar out. It could be a leaking ice maker valve or a bad ice maker control. Shut the water line off to the ice box and see if it quits leaking.

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Your problem is possibly one of two things. The ice maker is leaking or the defrost tray behind the rear panel inside freezer back wall is clogged with ice or something else. If you know its not the ice maker unplug the refrigerator and remove the back panel to see if the drain is blocked there, Let me know, Sea Breeze

check for levelness of the ice maker also make sure that the fill tube is inserted all the way into the unit

If it is leaking water in the freezer it will more than likely freeze amongst the ice cubes causing a block of ice.

It is more than likely leaking at the rear of the unit, near the valve or fill tube for the ice, this will run up the rear wall of the unit.

good attempt, its actually a clogged drain thats backing up and your drain water is not able to leave refrig so it falls to bottom of freezer floor and eventually out the door. romve the items from the freezer and take the lower back wall off form inside, directly under the evaporator under all that ice there is a drain hole, youll need to clear that hole of iec( pouring boiling water down until you get a free flow of water then you can reassemble uint problem solved