Ice accumulates on floor of freezer compartment

There are a few possible reasons for the ice build-up in the area behind the ice maker and above the fan, even if there are no visible coils in that area. Here are some potential causes to consider:

1. Blocked Drain: The defrost cycle of a refrigerator is designed to remove excess moisture from the freezer compartment, which typically drains out of the freezer through a small drain hole and into a collection pan located beneath the refrigerator. If the drain becomes blocked, the excess moisture can accumulate in the bottom of the freezer and eventually freeze, leading to the ice build-up you described. To check if this is the case, you can try locating the drain hole (usually near the back of the freezer, near the bottom) and clearing any debris or ice that may be obstructing it.
2. Faulty Defrost System: Another possibility is that there is an issue with the defrost system itself. If the defrost heater, thermostat, or timer is not functioning correctly, it can lead to excessive ice build-up in the freezer compartment. While you mentioned that the coils appear to be defrosted, it's still possible that there is a problem with one of these components that is causing the ice to accumulate in a different area.
3. Poor Air Circulation: A third potential cause is that there is inadequate air circulation in the freezer compartment. If the freezer is too full or if items are blocking the vents, it can prevent cold air from circulating properly, leading to pockets of warmer air that can cause excess moisture to accumulate and freeze. It's worth checking to make sure that the freezer is not over-packed and that there is nothing blocking the vents.
4. Water Leak: Finally, it's possible that there is a water leak somewhere in the refrigerator that is causing excess moisture to accumulate in the freezer compartment. This could be due to a damaged water line or valve, a faulty ice maker, or a damaged door seal that is allowing warm, humid air to enter the freezer. If you suspect a water leak may be the cause, it's best to have a professional diagnose and repair the issue.

Overall, it's hard to say for sure what is causing the ice build-up without further inspection, but these are some common possibilities to consider. If the issue persists, it may be worth calling a professional to diagnose and repair the problem.

If the defroster coil is not working, then ice will build up on the coils inside the back of the refrigerator.

But, you're saying that it's accumulating on the floor of the freezer jamming the pull out basket.

I would say that the timer or overflow valve is bad on this refrigerator causing ice to build up on the floor of the fast freezer compartment causing the jamming.

Are you sure it's the ice maker that's leaking? We have this model & ours accumulates a HUGE iceberg in the bottom of the freezer, but the water seems to be coming out of the back, at the bottom of the back panel, where the vents are.

I am uncertain as to what you mean by "when tray is full"? However, you probably have a clogged drain in the freezer compartment. During the defrost cycle, which usually occurs every eight hours, defrost components (defrost thermostat & heater(s) ) melt the ice that has accumulated on the evaporator coil in the freezer compartment. The water from the melted ice drains through a hole in the freezer compartment (behind the freezer's rear panel) and accumulates in a drain pan below the refrigerator. This water should evaporate over time, whereby you should not have to regularly empty the drain pan. If the drain hole is clogged (usually from algae or other debris, etc.), the water finds another path to flow (which is inside the bottom of your freezer compartment). This water will usually freeze. Water will then flow toward the front of your freezer compartment and out of the door on to the floor when you open the door.

Contact an appliance service company to unclog your freezer drain. Also have them check your defrost components (thermostat & heater(s)).

before you call check the bottom of your freezer, if it is full of ice, yuou more than likely have a clogged defrost drain
remove the back panel of the freezer and ensure the drain is free and clear,
check the fill tube of the ice machine to be properly installed

Your drain tube may be stopped up with ice at the upper end because it drains too slow because it's stopped up at the lower end in the evaporator pan under the unit at the floor. It can get dust and mold in it. Once you get the ice out at the top a little pressure with a turkey baster will usually clear it out. Flushing it out with hot water and clorox may help.
Make sure it drains quick enough to prevent refreezing. . The drain should be located below the evaporator coils on the lower back of the freezer.

It takes weeks for ice to dissipate in a freezer.
You may can adjust your cut off lights or wire cut off to cut off before it's so full.

have you checked the canister on the back is attached and not faulty?

sounds like an air leak. the ref. is sucking air in and condensing and freezing on that spot. check the gaskets really good.

check to see if the defrost drain is not frozrn over or stopped up
this is the only way that water can get into the freezer
frost could and melt but dont think that i would check the drain at the bottom of the rear freezer panel if you see ice it is stopped up for sure
if all is clear there go to the ice maker, have had some that are overfilling and runnig over the ice maker into the bottom of the freezer