I have a Hayward Aqua Trol T Cell 5 & typically the auto display gives you the salt level(2700-3400) then if you push the button once, it will give you the pool temp & so on. Now the auto display says 3.60 & if you push the button once, it says 31. There is nothing in the manual about this. I bought it a little over a year ago. It’s only been installed right under a year. Any idea what this is?