I installed a new Pentair Superflo (1hp) yesterday. Had some initial priming problems, but it primed fine this morning and water circulates well. But only for about a minute--then the pump shuts off. It stays off for a minute or two, then comes back on. This only happens on the high setting; it runs on low fine. Doesn't flip the breaker. It acts like it is overheating and flips some kind of shutoff, but it happens after 1 minute max (including first thing in the morning) and the motor doesn't feel hot at all. The hp on this motor is lower than the one it is replacing, but I can't imagine that would make it strain more somehow (again, runs fine on the low setting). Voltage to the pump is ~240. Any help would be greatly appreciated!