Wmidonniereese

I have a Aqualink with aquapure 1400, it is about a year and a half old. I do have the newer tri-sensor with black epoxy and small circuit board at the end of the cable. About a week ago, the the add salt light came on so I took a sample and had it tested (reading was 2100ppm) added 2 bags of salt, next day took another sample for test, (reading was 2800). Now my salinity reading on the display is HH with a Service code of 145. I took another sample and had salinity tested at two different places both came back at 2800ppm. Could someone please shed a little light on this matter for me.. Donnie