Fairly new pool owner and I just noticed for the past three days that when we wake up in the morning, the spa is drained of water almost completely into the pool. When the pumps turn on though, it refills back up. When I go look at the equipment (not knowing what to look for) I noticed that one of the valves (?) is constantly turning/rotatating when its in pool mode. If i switch to spa mode, it will move to the right direction and stop like its supposed to. But when I switch to pool mode, that valve keeps spinning and spinning. Does anyone know what could be the problem? Thanks so much for your help!