Snack Man 2000 Posted January 22, 2017 Share Posted January 22, 2017 I picked up a fairly new Wittern 3179 today that the compressor does not come on. The evaporator fan runs, but nothing from the compressor. I checked the thermostat, and it seems to be fine. Could it be the compressor relay? If so where is it located? Link to comment Share on other sites More sharing options...
AngryChris Posted January 22, 2017 Share Posted January 22, 2017 Verify it isn't a power issue first. If the condenser fan never runs either, then it COULD be a power problem. Try to bypass the rest of the machine and plug the refrigeration deck in directly. On usi machines, sometimes there's a different kind of plug. Link to comment Share on other sites More sharing options...
Snack Man 2000 Posted January 22, 2017 Author Share Posted January 22, 2017 These machines are hard to get the compressor out to get direct power. Link to comment Share on other sites More sharing options...
Snack Man 2000 Posted January 22, 2017 Author Share Posted January 22, 2017 Was advised to put in a 3 n' 1 start capacitor. Anyone agree? Link to comment Share on other sites More sharing options...
AngryChris Posted January 22, 2017 Share Posted January 22, 2017 It's the cheapest thing to try first. I couldn't tell you how to do it. I have never done it, and yes they are hard to remove. I believe the easiest way to remove and reinstall is to use a block of wood UNDER the back, under the bottom of the machine so it tilts forward slightly. Then, when you have taken all 3,725 screws out, you can remove it by tilting it down as the screws often get in the way on the bottom side. Link to comment Share on other sites More sharing options...
AZVendor Posted January 22, 2017 Share Posted January 22, 2017 If the condenser fans in front of the compressor don't run either then you have a bad thermostat or burned wiring on the side of the compressor. If it's just the compressor not running while the condenser fans run then it's an issue with the compressor. If the compressor clicks on and off without running then it's possible to get it running with a hardstart kit but if it never tries to start then you need to pull the cover off the start relay and see if the relay is burned or some wiring is burned. USI uses a lost of crappy compressors so a hardstart kit is the best replacement for a bad start relay. The key to removing and reinstalled the condensing unit in these narrow machines is to loosed the four screws in the rectangular back plate that hold the evaporator to the plate. That will give you flexibility with the evaporator to get it out and back in easier. The levelers sometimes make it difficult to get the unit in and out so unscrewing them a bit also helps. Just make sure you put all the screws back in and putty up the hole by the harnesses. Link to comment Share on other sites More sharing options...
Snack Man 2000 Posted January 22, 2017 Author Share Posted January 22, 2017 Thanks, I will report back my findings Link to comment Share on other sites More sharing options...
Snack Man 2000 Posted January 28, 2017 Author Share Posted January 28, 2017 Okay, just got the compressor out and angrychris was right. There's a lot of screws to remove to get the unit out. Notice a few burned wires that looked like the touched each other on the overload. I cut the burned out and installed the 3 n' 1 and bam!!! Working like new. Thanks everyone!! Link to comment Share on other sites More sharing options...
AngryChris Posted January 28, 2017 Share Posted January 28, 2017 Good to hear! Link to comment Share on other sites More sharing options...
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