Very common for the recent Atwood HWH igniter boards to go bad. Many, many of us have had them fail. If under warranty the dealer should handle, likely they would replace it with another Atwood board.
However if it is not in warranty I would recommend replacing it with a Dinosaur Electronics board. They seem to be very reliable. You can even get them on Amazon and many larger RV dealers stock them.
https://www.dinosaurelectronics.com/