Well, that’s not good. Let’s just assume, for now, that it went bad on it’s own.
Check (thermometer, right)
I assume you mean evaporator, the part inside the freezer, right? The condenser is the part on the outside.
Okay, this is where it gets interesting. It could be icing up for lots of reasons. It could be icing up because it’s low on refrigerant. This will also cause it to not run as cold as you’d like it to. Take a look at the ice pattern. Is there a big chunk on one part of the coils, but the rest are most clear. Could be the top, the bottom, the left or right, but mostly in one area and concentrated around the TXV.
It could also just be iced up because it’s been running nonstop, or if there’s a lot of humidity in the air, or if your defroster isn’t working properly.
Ice blocking the coils will make it difficult or impossible for the freezer to maintain temp. Ice forming around the TXV (and/or it’s bulb) OR ice formed around the t-stat bulb will cause all kinds of wonky problems.
The first thing you might want to do is see about getting rid of that ice. There’s a handful of ways to do it, I can give you some ideas. If it’s possible, sometimes the easiest way is to unload it and let it thaw on it’s own.
Sometimes it’s to run it through a few defrost cycles.
If the evap coils are on the bottom, buckets of warm water are usually fastest, but keep in mind that all that water is going to pour out the bottom if it doesn’t have a drain plumbed to the outside.
But, just for kicks, make sure none of that ice is formed around the t-stat bulb (which may be snaked inside the coils), if that’s the case, the t-stat thinks it’s 32 degrees and that’s probably your problem.