I have the same unit and it's been less problematic of all the other brands I've read about on this forum. You've already cleaned the coils, good. I had mine about 1.5 years before I thought to do that. After getting enough dust and pet hair out to knit a sweater, I try to hit it every 6 mos. The next step is to quit messing with the temp setting and leave it running. It will take 40 mins or so to cycle off. While it's regulating, go find or go buy a thermometer that you can use to measure the temperature of a glass of beer. Shoot for 36-38 degrees on the second pour (chug the first or pour two glasses quickly). If it can't get low enough and it's sealed properly, you may have a freon leak (I did). If you can't dial it down low enough to keep from freezing the beer, then the temp controller is suspect. Did you buy it new (I assume not since you cleaned the coils)? Is so then Bevair will send out a commercial tech to repair it under warranty, but I would go through all the tips brought up so far to make sure it's not operator error. If you didn't buy it new or it's out of warranty then you'll have to hire your own repair tech. The temp controller is available from Bevair for less than $20 the last I checked and is most easily reached by taking the top off the unit. You can get to it from inside but you'll bang around the evap coil getting to it and it's real awkward to mess with because of the location. You don't want to buy the external controller from MM because you'll loose power to the fan that cools the tower unless the compressor is running.
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