I've had my Circupool RJ20 up and running for about 3 weeks now and levels have been great through my own testing. However, it just occurred to me that I've not tried looking at the actual unit for its various readings yet. I tried doing so today but don't get any valuable information - I get a water temperature of 32 degrees and a "Salt OK" message rather than a specific ppm reading (the same message displays upon startup each time). The manual is rather vague on some of this, but I am simply holding in the OK button for 5 seconds to get to these readings. Am I missing something here? Is my unit working correctly?