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Well, a really nice tech came out today from Aqua Quip called Randy. He replaced the breaker - upon inspection the breaker they used upon the initial install looked like it was a used one, it was all busted up and a little corroded, ugh!. He replaced it with a brand new Siemens one. Flicked it on and it works like a charm! He really took his time and went over everything to make sure it was working great. He was trying to work out why the heater would not stay on when both pumps were in use - he tried switching it over to 60amp logic (?) with the jumpers in the control unit but no joy. He said he was going to look into that for us as it might be a feature they disabled with software or something.Anyways, nothing but praise for this guy, he was really friendly and did an awesome job. Going to send his manager a nice note thanking him.