Hi all. I am needing some help with my Bryant 582A series packaged heat and air unit. The unit is about 8 years old and it will not heat. It was working yesterday, but my wife and I heard a loud noise come from the unit in the night and now, no heat. The unit will also not stop running and blowing freezing cold air. I shut it down at my breaker box. There is a vent hood just to the right of where the wiring enters the unit and it has what looks to be, pieces of a rusted pipe falling out of it. The burners are not lit and won't light. I have ZERO knowledge when it comes to things like this, so elementary explanations will be appreciated. Thanks in advance.