TB,
If you connected the Red and Black wires coming out of the cell together and the red flow light is still on then the cell is bad.
Either the cell "thinks" there is low flow, or the cell light itself is stuck on.
If it is just an LED issue, the cell should still generate chlorine.. Does the Cell light come on? Keep in mind the cell light only comes on if the cell is making chlorine, So at 50%, the light will be on for 2.5 minutes and off for about 2.5 minutes..
If the cell was part of a new pool build it probably has a three year warranty..
If not a bad LED, you are stuck with buying a new Cell.
Thanks,
Jim R.