If your stove is not burning as it should it might be due to a variation of different reasons.

Some recommendations is to check if you might be using too little kindling when lighting, or if the wood is too thickly cut. This can lead to the firebox not reaching the correct operating temperature. Incorrect lighting can also lead to poor combustion with heavy sooting and may result in the fire going out when the hatch is shut.

Download lighting instcructions here.