See page 3 of the manual http://www.raritaneng.com/pdf_files/lectrasan/L270v0404.pdf

Also note that the same light indicates both low salt AND low voltage...only difference is the blink rate for each one. So...

1. Flush out the system and clean it again, following directions this time...and make sure it's getting enough salt. When in fresh or brackish waters, add two coffee measures of table salt to each flush. But don't go nuts adding salt...too much can be just as bad as too little.

If you use fresh water to flush the muriatic acid solution out, it would be a good idea to make up a couple of gallons of the brine solution that the 2 gallon salt feed tank would use if you had one. "Reload" the LS by flushing two gallons down the toilet.

2. See page 9 in the manual for all the possible electrical issues that can cause it not to work propee abrly.

If none of the above solves your problem, call Vic Willman at Raritan--800-352-5630 x 6.