Pool and Spa
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Hi, I'm Mike G and I'll be glad to assist you. The process of elimination is what you need to do. If the spa was working well up until recently, the first thing the symptoms suggest is a bad or failing breaker connection. Check the termination and the jaws. Look for signs of arcing. Arcing produces heat and that will trip the breaker. The 30 min time is why I think it may be that.