Varmtvannsbereder virker ikke

Hi, My name is Reddy. i live at Landastorget, Bergen My apartment running hot water stopped last evening. i dont know what happened. i think it might be hot water tank problem. All the electrical fuses and switch board are fine. i am looking for a plumber/ electrician who can check what the problem is all about? If we need to change the tank we can talk about the price after you inspect.