I have an concrete IG pool and spa combo, with solar heat that has worked just fine for over a year. With nothing that I've changed suddenly when I turn the spa on the water empties out of it instead of the jets shooting stronger.

I have an Aqualink that controls the spa/pump/solar, etc, but even when I turn this stuff on manually (at the control panel near the pump) it does this.

When they first set up the pool/spa they set the valves so that some water would always come in through the spa (I think he said about 20-30%) when the pump is running to clean the pool. I know the solar diverts about 50% of the pump pressure (I have a 2 1/2hp pump for the 15x30 pool so it's rather oversized).

I don't even know where to start to look for the problem here -- does anyone have a clue or do I need to call a pool repair person in?