Good morning,
This is where I am. I have finished "testing" by disconnecting everything from the control board (except the circulation pump) and separately and independently running the heater, pump 1, pump 2, the blower and the ozonater. I ran each independently for several days. The fuse did not trip (see below for one exception) for any of the five (heater, pump 1, pump 2, the blower and the ozonater). I have everything except for the heater connected now. I have tried starting the pumps and blower dozens of times and still no trip). I will hook up the heater next to see what happens.
The one exception on the fuse tripping is when I manually turn the breaker on. It almost always trips at least once. If I manually flip it a few times, it "holds".
If I hook up the heater and it does not trip, great (maybe there was a loose wire in the control board that I tightened in the disconnecting and reconnecting process, although I dont think so).
If I hook up the heater and it does trip, is my next step to try a new breaker? Thanks very much.