The older boards, that do not show cell type, use a jumper on the back board to change cell type.
Try this:
1) switch the switch to off.
2) turn percent knob to 50 percent.
3) wait 5 minutes.
4) put switch back to auto
5) within 30 seconds you should hear a click
6) when you hear the click, wait 30 seconds and then scroll through the diagnostic readings
The default display is average salt level. Pressing the diagnostics button provides the following information:
1) Temperature.
2) Voltage.
3) Current in amps.
4) Percent production selected.
5) Instant salt (Has a - in front of number.
6) Name Display
7) Software revision level
If the instant salt is very low, then the cell is likely to be bad.