I've got a problem with an AquaBoost II system. The system is fed from a 5000 gal. storage tank. I'm having a problem with the unit not shutting itself off. I set the pressure according to the manual and it seems to work fine for a few cycles, and then it seems to forget what the pressure is set at and it jumps up to about 60 psi and will not shut off, If anyone has had this problem or knows anything I would love to hear some input.