1. Your pump display should display the following at all times as long as the pump is energized and if the control cable (RS-485) is connected properly to the IC 485 bus.
PUMP ADDRESS 1
DISPLAY NOT ACTIVE
If, it displays nothing, it has either failed or it is not receiving power (unless the display has failed).
If you had this installed by a pool builder recently, he should honor the warranty, especially if you do not have the skill sets necessary to begin troubleshooting the power?
CAUTION: Whatever you do, before you open the high voltage compartment of the IntelliCenter Load Center, ensure power is removed at the circuit breaker that provides power to the Load Center, at the house circuit breaker panel.
Reading the above comments, It sounds like it worked for a while and then just quit. Is there anything "unusual" that happened or was done to the system between the time that it worked and the time that it didn't?