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Compressor comes on but not cooling


NYC royal

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Hi I'm new to this vending world, I recently bought a royal 660-9 from a local guy off eBay, the machine work well the 1st month or so but now I'm having problems with it and I can't get this guy to come service it so I plan to do as much as I can on my own with some help from you guys thanks in advance. As I said it's a royal 660-9 and the problem I'm having with it is that it's not cooling anymore, I've unplug the compressor from the plug in the unit and plug it into the wall outlet at 1st it sounds like the compressor is running but after 20mins or so it's still not cooling down. I'm not sure if the compressor is bad or if I have a bad relay, any suggestions? I'm at a lost here..thanks for reading 

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First thing is to verify the compressor is on.  Sometimes it's hard to hear.  If I can reach the compressor, I'll unplug the deck and feel if the compressor is hot.  If it is hot, then it's probably working but may be low on refrigerant. If it's not on, it could be a number of things.

If it stays on for 20 minutes and shuts off, it's usually low on refrigerant OR the condenser fan isn't working right.  If it were me, I would just take it out and exchange it. Royals seem the easiest to me.

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