My control board went out a couple of weeks ago. I ordered a new one. It seemed to work just fine.... But now it will not read that there is any salt in the pool. I had it tested and it has 3000 in it. But the unit shows 0. I tried to calibrate it and it will not even calibrate. I think it is something with the board.... But the place I bought it from says it is the tri sensor . Does anyone have any idea what is going on?