A black stove glass is often an indication of incorrect burning behaviour:
Use of unsuitable fuel
Incorrect lighting
Incorrect air supply setting
Unsuitable flue draught for the stove
Black plumes can also occur when seals become porous over time. Door seals are wearing parts that can become damaged over time due to frequent opening and closing of the stove in combination with permanently high temperatures in the combustion chamber. We recommend a general replacement after 2,000 hours of operation to prevent the door from no longer closing airtightly and heat and thus energy being lost during heating or flue gases from entering the living space.
You can check the quality of the seals with a simple test: Place a sheet of paper between the stove door. If the paper can be removed without much effort when the stove door is closed, the gasket must be replaced! You can get new gaskets either directly from us or from your local specialist dealer.