@westom

The manufacturer took the board and replaced it. I was not able to keep it. I carefully inspected the board and it had absolutely no visible damage on both sides. There was a 3 amp fuse for the low voltage part that was blown. A 20 amp fuse for the high voltage part was okay. The technician disconnected all devices from the board and we replaced the fuse. I blew right away. So the error was on the board itself.