If the up level valve coil is magnetized and the ball valve isn’t closed, first thought of course is the screens. Did you check the up level adjuster screen and the screen under the up metering block? Then I’d put a gauge on it and make sure it’s building pressure. If not, something wrong with the pump. Then I’d back out relief to make sure that isn’t biting you. After all of that reset low pressure. Back out up start, turn in up stop, turn in up level. After that you’re taking the valve apart.