GE Monogram 42" built in model ZISS420DRGSS, evaporator fan icing up

[JK714]

The fridge was manufactured in Oct, 2005 and we bought it used about 5 years ago. It's ran fine with no issues but recently (last six months) has developed an issue where the evaporator fan will get stuck as ice forms around the tray and catches the fan. I've tried unplugging the unit for 8 hours, which manually defrosts the ice, and it may be good for a week or so.

I recently replaced the icing tray which is supposed to heat the ice under the evaporator assembly and then drain off into the pan sleeve where the compressor evaporates the water. This worked well for about 3 days and then the pan went dry so I knew the ice was not melting under the evaporator.

I'm currently manually scraping the ice around the fan opening so the unit will continue to cool until I can figure this out.

I've gone through the onboard diagnostics (damper tests, temp control reset, etc) and everything seems to functioning well. 

Before I drop $8K on a new fridge, I'd like to try and fix this if possible.

I've left the back panel off the freezer section for easy access to the fan (pic below shows the ice as it's formed below the fan).

Any help would be greatly appreciated.

[Coley]

I'm seeing the same problem on a similar unit. Takes about a month before it stops the fan.

[WilliamC]

Did you find a solution? I have similar model fridge, about 16 + years old. Started having similar problems last year with icing in my fridge side. Thought it was the damper but it was fine. I replaced some of the temperature sensors. That worked. I replaced one that was easy to get to on the lower freezer side wall as well. There is another one above that fan. Maybe if you replaced that? PART 336, a few bucks on amazon. Good luck.

[Sinister310]

Does your fan constantly run? I have a similar model and it seems that the freezer fan runs all day long