Bedroom doors are usually hollow. This means that both faces, the interior and exterior, are made of thin plywood. If they get slamme abused or the door has a factory defect, the door can crack. Before attempting to fix a hollow core door , remove any debris sticking out of the door and sand down any sharp edges you see. It completely depends on the context - are the shots expecte or a total shock?
Do they happen indoors or out? Depending on what class of chimney or flue you have there could be numerable causes. You need to find a chimney sweep who will look into your chimney and show YOU what the cause is and how much it might cost your landlord to fix and reapir.
The ceramic door plate fell off a few years ago when one of the children slammed the door. I have a fairly large crack in my bedroom door. Repairing a Hollow Core Door We were moving furniture and put a hole in the face of one of our hollow core doors.
The important thing about fixing a hollow core pressed wood door is to make the door structurally sound so that continued use of the door over the next few years wont result in cracking where the repair was made. The best hinges for hollow core doors is still the base molding spring stops, (as seen on the door in this foreground) and not the hinge pin stops (as seen on the two doors in the background).