Pressing and holding the “More” button launches the System Status Mode. When the lights finish scrolling, the percent lights indicate hours of usage in 1,000s. For example, if the 40% light lights, that indicates 4,000 hours.
Version 3.1 on adds the ability to determine system temperature. Pressing the “More” button after the display shows 1,000s of hours of usage, will show temperature as follows:
Lights…………….....………Temperature
No LEDs………….…..………Below 30F
40%......................................36 to 45F
40% and 60%...................46 to 55F
60%......................................56 to 65F
60% and 80%..................66 to 75F
80%....................................76 to 85F
80 and 100%..................86 to 95F
100%.................................96 to 99F
100% blinking…..…..….over 99F
All LEDs blinking……...Sensor bad
Press and hold the More button until the lights scroll and note which % light lights up. Then, immediately press the More button again and see which % lights light up.
Is the Cell light solid green?
If you have automation, you should be able to get a salinity reading from the automation. What does that show?
If the first part of the System Status Mode test does not light up any lights, that might mean that the cell has less than 2,000 hours.
What is the water temperature?
What is the manufacturing date as shown on the label on the back of the cell?