I would suggest that you take the cell to an authorized Jandy service center and tell them that the cell is less than a year old, it's not working and you would like a warranty replacement.
They can confirm the age of the cell from the serial number and they can determine if the cell is bad.
Can you post a picture of the cell posts and the cell plates?
They can confirm the age of the cell from the serial number and they can determine if the cell is bad.
Can you post a picture of the cell posts and the cell plates?