What causes clinkers in wood fired boiler?

Clinkers in wood-fired boilers are primarily caused by the combustion of wood with high ash content or low-quality fuel, which leads to the formation of solid residues. When the ash melts at high temperatures, it can fuse together, creating clinkers that block airflow and reduce efficiency. Inadequate combustion conditions, such as insufficient oxygen or improper combustion temperatures, can also contribute to clinker formation. Regular maintenance and using appropriate fuel can help minimize this issue.