- The brick flue is cold. Burn a few newspaper sheets through the sweeping opening in the lower duct of the flue to start the draught.
- There is low pressure in the room caused by an extractor fan, another fireplace or other device. Ensure sufficient make-up air: stop the extractor fan/mechanical ventilation or open a window when lighting a fire.
- The ash box is full. A full ash box prevents air circulation within the stove. Empty the ash box.
- There are leaks in the flue connection. Seal the connection.
- The smoke ducts of the stove are blocked. Clear the smoke ducts through the sweeping openings of the stove.
- The flue connection pipe is too deep in the flue. Shorten the flue connection pipe and/or pull the stove and the pipe further from the flue.