Vermont Castings Defiant Flexburn 1975C problem

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wilson1970

New Member
Nov 23, 2020
11
Netherlands
Five years ago we purchased a Vermont Defiant. After years of enjoying it, the stove now burns less well. In the non-catalytic mode, the heater always fired better than in the catalytic mode, but now there is no difference anymore and it seems the stove is only burning in catalytic mode (although the damper is open). In other words: there is no difference in both positions. What could be the issue here? Kind regards, Michiel, Netherlands.
 

wilson1970

New Member
Nov 23, 2020
11
Netherlands
PS: I also noticed some gaskets hanging out of the damper housing (please see screenshot). How bad is this?
 

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Feb 23, 2016
36
Addison mi
Five years ago we purchased a Vermont Defiant. After years of enjoying it, the stove now burns less well. In the non-catalytic mode, the heater always fired better than in the catalytic mode, but now there is no difference anymore and it seems the stove is only burning in catalytic mode (although the damper is open). In other words: there is no difference in both positions. What could be the issue here? Kind regards, Michiel, Netherlands.


Hello
My Defiant flexburn does not burn as well as my older Defiant did.
I extended my chimmney in height by 1 section to try to bring more heat out of it.
I would definately replace those gaskets
 

Diabel

Minister of Fire
Jan 11, 2008
3,281
Ottawa, ON
Five years ago we purchased a Vermont Defiant. After years of enjoying it, the stove now burns less well. In the non-catalytic mode, the heater always fired better than in the catalytic mode, but now there is no difference anymore and it seems the stove is only burning in catalytic mode (although the damper is open). In other words: there is no difference in both positions. What could be the issue here? Kind regards, Michiel, Netherlands.
Can you describe bit more how the fire behaves in each mode. That gasket, try pushing it back in for now. But be ready to replace it after the season.
 

wilson1970

New Member
Nov 23, 2020
11
Netherlands
Thanks for the reply. When I start the fire (of course with the damper open) all goes well with kindling wood & paper, but after a while big (dry) logs just won't light up, even with the damper open. Before this there I could always create a big fire and heat up just to the temperature was high enough to close the damper. And the chimney is swiped a few months ago...
 

Diabel

Minister of Fire
Jan 11, 2008
3,281
Ottawa, ON
Is there any way you can test the moisture of your wood? Sounds wet wood to me.
 

wilson1970

New Member
Nov 23, 2020
11
Netherlands
Yes, I have, it's 18% and that's rather dry isn't it? I have to open the ash drawer constantly to get the fire on. That shouldn't be necessary...
 

Diabel

Minister of Fire
Jan 11, 2008
3,281
Ottawa, ON
18% on a freshly split log face is good. If your fire dies in a bypass mode, the only reason i see is wet wood or some sort of partial chimney blockage that prevents a good draft. On a side note, what is the condition of the cat?
 

Diabel

Minister of Fire
Jan 11, 2008
3,281
Ottawa, ON
It looks like you are not burning in cat mode much. If you did it would be more of a light grey colour. You should start thinking of purchasing a replacement cat for the next season maybe.
 
Feb 23, 2016
36
Addison mi
Toasty
 

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