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Whirlpool freezer Mod WZF34X18DW00 freezes fine for a week or two then evaporator ices up. Internal tests run okay. There are no error codes. All suggestions appreciated.

Hi, Okay here goes...had an Error Code 50, cleared the code out, would come back in a day or so. Fridge was holding 39 degrees. I cleaned the condenser coils bu they were fine no dust. Same story EC50 comes back. Since I have a spare fridge,moved all food over. Was for a rental and its sitting there all empty so thats good pressure off from the Missus. Then I replaced the condenser fan motor, with an OEM motor ordered from SZ certified appliance store Fridge would not get below 46-47, set at 38, just sat there 46. Removed shelves, diffuser light, removed the back panel. I see ice only in the top left where the copper line enters the evap coil. Its a black evap coils, no hint of copper in the actual coils all blaack (i read somewhere maybe older evap copper coils were a problem on SZ). When door open and I press 2 switches, the evap fan works.I gently knocked the ice off upper corner of evap coil and am trying to lower temp slowly (set at 45, wait, then try set 40, wait,etc). Thoughts?

File Name: GE Refrigerator Icing Kit WR49X10021 Service Bulletin File Submitter: RegUS_PatOff File Submitted: 22 Oct 2013 File Category: Appliance Repair Manual Pot Luck Supper GE Refrigerator Icing Kit WR49X10021 Service Bulletin de-icing WR49X10021 ZISS42 ZISS36 ZISW36 ZISB36 ZISW42 ZISB42 ZISS48 ZISB48 ZISW48 ZIS48 ZIS36 ZIS42 REF16-00.pdf Click here to download this file

File Name: Whirlpool Service Pointer: Evaporator Drain Tray Icing in JADE, Jenn-Air and Amana Built-in Refrigerators File Submitter: RegUS_PatOff File Submitted: 04 Jun 2013 File Category: Appliance Repair Manual Pot Luck Supper Fridge may be made by Dacor Service Pointer: Evaporator Drain Tray Icing in JADE, Jenn-Air and Amana Built-in Refrigerators R8178735 c.2008 42” and 48” Built In Refrigerators Evaporator Drain Tray May “Ice Up” Service Pointer 8178735C c.2008 Whirlpool Canada 42” and 48” Built In Refrigerators Evaporator Drain Tray May “Ice Up” 1103095L Instruction Sheet for Evaporator Drain Tray Assembly Installation Kit Part Numbers: W10199913 (42-lnch models), W10199915 (48-lnch models) dacor Refrigerator Models: EF42BDCB EF48BDCB EF42BNDB EF48BNDB IF42BDCB IF48BDCB IF42BNDB IF48BNDB Click here to download this file