Freezer is too warm

Refrigerator & Freezer Repair
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1

The freezer is too warm in my GE Profile [FONT=Calibri][SIZE=2]PSS26NSTSS side by side.

Noticed frost on the back of the freezer, used a hair dryer to warm it, and then the evaporator fan kicked on after 5-10 minutes of defrosting, and then the refrigerator returned to normal after a bit.

It seems the evaporator fan doesn’t come on unless I defrost the rear of the freezer first. From there, it will maintain good temps for a couple days and then slowly start to warm up. [/SIZE][/FONT][SIZE=2]The refrigerator side is close to normal, even closer when the freezer is close to 0 degrees.[/SIZE]
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Compressor and compressor fan are working fine, and the compressor’s radiator is cleaned as well.

Could this problem be the thermistor by the evaporator?

Thanks!
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3

I’m leaning towards the defrost limiter thermostat as the problem. Would the part number be AP3884317?

4

Seems like a bad mothjerboard in the back AP4436216 While the freezer is still cold,pull the cover off the motherboard and locate the 3 pin power connector, then unplug fridg and pull the connector off. Identify the mating pins as labled on the motherboard, line and def. Put a wire jumper between these pins, then plug in fridg.
If you get defrost action replace board, if not, most probably a bad defrost heater.