Try the following
1) Turn the switch to Off.
2) Push the diagnostics button and record all of the readings
2) Wait 5 minutes
3) Turn the percent to 50 %
4) Move the switch to auto
5) Within 30 seconds, you should hear a click.
6) Wait 30 seconds more
7) Push the diagnostics button and record all of the readings
Then repeat the above procedure again.
This will give you 4 sets of readings. Post the readings, the measured salt level and the make and model of the cell, and we should be able to help.