Adjust the pressure switch. If the pressure switch isn't adjusted properly, then the pump will never come on or shut off properly. If you have a Power Station, you will have to adjust both the pressure switch and the chrome bypass valve. The switch is very sensitive. Keep turning the screw down even if it reaches the bottom. It does not stop turning because it is still adjusting the switch. There is a possibility that the switch itself is defective and we can replace it (if the pump was purchased from us). This doesn't happen very often, though. Please try the things mentioned above first. The pump and the electrical components have a one year warranty.