I have an Aqua Rite Pro. The "Check System" light is lite and the LED only displays "Check System". If you push any of the buttons on the unit nothing happens. I have a pool guy (just bought the house and had no experience with pools) says I need a new board. When I called Hayward they asked if it was the control unit (part GLX-CTL-AR-PRO) or the PCB unit (GLX-PCB-AR-PRO). Does anybody know which part I need to purchase?