Whirlpool WRF736SDAM14 Ice Maker Fill Tube Keeps Freezing

My ice maker wasn’t working, so I replaced it. I didn’t realize at the time that it was the fill tube that kept freezing up. I manually ran the fill tube heating element in test mode, which cleared the obstruction.

But it kept happening. So I replaced the heating element for the fill tube. That didn’t fix it.

I read in another thread to replace the water inlet valve inside the unit, which I did. And that didn’t fix it. It still freezes up.

Aside from replacing the main board, is there anything else that can be done? And if that doesn’t fix it, I’m stumped. Any help is appreciated.

At that point it is either an issue with the fill tube W11686799 between the valve in the ceiling of the refrigerator section and the icemaker, or the user interface (W10865869 for black and W10852669 for silver) on the door. The user interface carries the logic for the icemaker cycles and functions on this model.
Before replacing anything else you can try using some permagum or mastic to seal around the fill tube where it enters the icemaker cover to prevent warm air intrusion, and make sure the fill tube heater is as close to the icemaker end of the line as possible while remaining fully on the fill tube.

So start by blocking this opening where the tube goes in?

You’ll need to drop the ice box housing down and seal around that tube where it goes into the ice box.

Are you talking here around the black rubber piece? And how would that affect the heater if I cover it with mastic or permagum?

Yes, right there around the black plastic piece and the port it is going into, you don’t have to cover the entire black piece with permagum/mastic, just make a good seal. The heater goes on around the actual tubing and whatever of the black plastic isn’t covered by the permagum.

I sealed with 400F silicon so hopefully that will work. I doubt the heater gets that hot.

Also, where the screw hole in the heater tape is, it barely covers the tube but mostly the white housing and black part. Should that be shifted down to cover more of the tube?

Correct, the heater needs to be on the actual tubing as much as possible.

I think sealing around that black rubber gasket and moving the heat strip did the trick. It’s been working for a couple of days now. Thanks for the help!