If the pump cuts off at 30psi the pressure switch needs to be adjusted. Take the cover off and turn the screw clockwise until you get the pressure you want. I like 60psi on mine. If the pump don't cut off, just runs and runs the bladder in your presssure tank could have a hole in it, or you could have an air leak or the bladder needs to be pumped up. There is a valve on the tank like a tire valve and it needs to have air in it. I think it is supposed to be half of the cut out pressure. If it was working ok before I would check this first, that might be all you have to do.
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If the pump cuts off at 30psi the pressure switch needs to be adjusted. Take the cover off and turn the screw clockwise until you get the pressure you want. I like 60psi on mine. If the pump don't cut off, just runs and runs the bladder in your presssure tank could have a hole in it, or you could have an air leak or the bladder needs to be pumped up. There is a valve on the tank like a tire valve and it needs to have air in it. I think it is supposed to be half of the cut out pressure. If it was working ok before I would check this first, that might be all you have to do.