Do a search on your stove type or the US Stove company or Hot Blast. I think they are all the same. You need to have a deep bed to sustain a coal fire. It is not like wood and readily burns what is nest to it. The draft is tricky, it might be to high or to low. Depends an how plugged the grates are and how well air is flowing up threw the coal. It MUST come up threw the coal. To much draft would just be wasting heat up the chimney so I would guess it is not coming up threw readily. There are people using your stove, so do the search and you will find your answers. Also, the type of coal is real important. I would guess you need nut or stove.