When you say "hunting", so you mean that it's coming on occasionally for a few seconds despite no demand? If so, other possible causes are dripping taps, and a leak
My current pump is quite a few years older than the previous comment to mine on this thread, so I thought it might prove helpful to anyone looking for helpful suggestions now, as I was.
I guess sarcasm and the use of capital letters is thought to be helpful by some contributors. I will stick to just trying to make helpful comments, like the vast majority of the posters on here. Isn't that what this forum is for?
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