We just had a bunch of rain. My first big rain with the pool. My salt was around 3000 ppm with Taylor test and the aqua logic said 2800 and after rain my Taylor test said 2600. I just backwashed too a day ago. The system said low salt so I added a bag. Then I went to the diag menu and instant salt said 0000. I think it always has. I accidentally pressed + so now it reads 0000. First of all, why does the instant salt reading say 0000. And 2, how do I get the sensors to read the salt levels correctly now? Is the 0000 indicative of a problem?