I was hoping to breath some new life into this topic (I left the hot tub alone since boating season started). The problem was that on Pump 1, when I would try to turn it on, I would hear a loud buzzing sound (almost like it was frozen) for 3 seconds, it would stop, and the pump one filter setting would turn on (setting that only circulates the water). FYI- Pump two just has one setting- on. I switched the pumps at the circuit board and when I would turn on pump two (which was actually pump one) it worked fine. Last week, pump one started working as it used to, but it doesn't circulate any longer. Weird?!? I assume this will cause issues when winter comes?