My fireplace insert is not operating correctly. It is smoking everywhere, through the vents, out the door and out and of the sides. It was removed this spring for chimmey cleaning, the insert was placed back into the opening and it has not been properly working since. We have changes the seal around the door, cleaned the door and still nothing is working. Could there be a crack in the masonary that is inside of the insert? I am not sure what brand it is. Also I have placed more insultation around the sides of the insert, still smokes. We have an enlosed chimmney vent, I mean no birds or nests can come through it. Your help is needed. Thanks.