ET8 reports something along the same lines. Noticed some algae in the last 24 hours so I took a look inside the salt cell. Some scale/calcium on blades that an acid wash removed after about 15-20 minutes. No real visible 'wear' on the unit, though it is a shade over 5 years old. Fired the system back up and everything checks out fine for about 5 minutes and then the 'inspect cell' light flashes again. No flow issues, cannister filtered just cleaned today etc.. Any ideas? Just a case where the cell may have reached it's end of life?