A while back we had our infamous rolling blackouts and in the weeks that followed, the freezer section on my GE side by side would completely ice up. I went through cycles of thawing that bitch out every couple of weeks. It went on for a while till my gf insisted that I get it fixed. So I stopped and bought a new defrost element for the freezer, yanked the old one out (you could look inside the tube and see it was burned out) and replaced it with a new one.
Everything worked fine, I got some sex out of the deal, everyone was happy.
Fast forward 4 months.... the freezer ices up again. Refrigerator section warms up and the complaints start pouring in.
I'm dumbfounded. I defrost it, pull the defrost element, looks good, tests good with a meter. I put everything back together and it works awesome for 3 weeks.
Fridge is warm again. Freezer is iced up.
What should I check next?
Is it a bad thermistor?
Which one should I test first?