Brent,
In the past year we have seen several reports of the EasyTouch reporting zero salt.. Pentair knows the problem exists, it just does not know how to fix it. This failure has nothing to do with the cell producing chlorine and nothing to do with the low salt light on the cell.
Let's look at the cell itself...
The very first thing you need to know is the actual salt level in your pool. I use the Taylor K-1766 salt test kit, what do you use? You really can't tell if the cell is reading high or low unless you know the actual salt level.
I have never heard of a cell that shows the red low salt light sometimes, and then the flashing green high salt light other times.. On the surface, I'd say that is very unlikely. Just to makes sure we are on the same page, the green good light and the red low light will alternately flash back and forth for about 5 minutes each time the cell is powered up... It this what you are seeing or is the green light flashing all by itself?
Even if the green salt light is flashing, the cell will still produce chlorine.
If you know what the actual salt level is, I would add salt to make the low salt light go off, as long as you can keep the actual salt level below 4000 ppm.
I can't do much about your pool builder, but I would ask your pool builder, or Pentair, for the name of your dealer's Pentair rep and give him a call. I know from practical experience that Pentair normally takes pretty good care of their customer's so I would call Pentair again and ask for a supervisor it not happy with the response.
Thanks,
Jim R.