Hello everyone I need help. I got Stuart turner Mainsboost Flomate MBF 12 pump. It was working perfectly fine for over a year. I noticed that pump won't shut off when the taps are not in use. I bought new one it's still same! What's the cause of this kind of problem? When I turn main valve off it stops so it's not the sensor. There is no leak anywhere as if it was pumping all that water I would be floating by now it's been like a 2 weeks. I'm afraid pump will burn out soon.