E,
The cell should have a two year warranty.. If it came in pool install with 3 pieces of equipment, it should be 3 years.
But you are correct, 2 years is unacceptable..
That said most cells last 5 to 7 years..
I have been through three cells, in my 3 pools... One lasted over 9 years, one about 8 years and one just over 7 years...
Not sure what happened to yours...
Lightning strike maybe or ???
I'd call Pentair, all they can do is say... they won't warranty it.. Better than doing nothing.
Thanks,
Jim R.