The cell light on my Intellichlor IC40 began flashing the other day, so did the acid cleaning procedure. This did not stop the light from flashing, so I then did the diagnostic test by holding the "more" button. The test doesn't give any of the fault lights, says that the cell life is 40% consumed and the temp is 80 degrees. The salt level light is solid green, indicating it's good. Any ideas why the cell light is still flashing?