I've recently received a free hot tub. The CTI circuit board was damaged so I found a replacement spa pack and heater which was identical to the last one with the exception that it has an option on the side to plug in a circulation pump. I hooked everything up and it runs fine with the exception that it doesn't run the 2 speed pump intermittently to keep water circulating (like it did with the last spa pack). I'm wondering if I need to add a circulation pump (which I got with the spa pack) or if there is a way to configure it to run the 2 speed pump intermittently again. Any help is appreciated! Thanks!