I bought a new elite FS and put it on the console of my boat. Took the boat out today and I have no problems with down and 2-D sonar, but I have no side scan. I only have one transducer on my boat. It’s a three in one transducer and it will not show up when I go to find the source / transducer. Previously I had an HDS 9 Carbon unit hooked up to my three and one and had no problems. Any idea what my problem may be?