Enviro Evolution EF-V soot

[Mark3m]

I have an Enviro EF-V that I’ve been running since about 2008. It has run well until recently.

Stove vents (DuraVent?) to a clean-out tee, then vertically through the ceiling and roof—total length of vent is about ten feet, terminated with a cap.

The flame is good—definitely not lazy. However, when I clean my vent pipe, there is more soot than ash and maybe some creosote buildup.

Does anyone have any ideas about what could be causing this issue?

 

[johneh]

Soot and creosote are indications of
1 a maintenance fire when little heat is needed
2 lazy fire incomplete combustion due to lack of combustion air
3 Dirty stove needs a full cleaning.
4 Low-quality pellets.