First you should try to provide more specific information since most including myself probably won't know what you mean by the "fire part". There are a few logic problems to solve. Each one has clues preceding it to help you figure it out. Look for banners/images along the hallways leading to the chamber that give you a hint to the order you need to activate things. If you are referring to the braziers that switch between fire, ice and storm then you need to light them all up a certain way to go through the door.