It depends on the type of repair needed, but when in doubt, don’t use your fireplace until a professional evaluates it. If you have water leaks, damaged flashing, or structural problems, using your fireplace could make the damage worse or create safety hazards. Problems with your chimney liner, crown, or flue are particularly serious because they can allow dangerous gases to enter your home or create fire hazards. If you notice smoke entering your room instead of going up the chimney, stop using your fireplace immediately. A professional inspection will tell you whether it’s safe to use while repairs are being planned or if you need to avoid using it until the work is completed.