2010 Osburn 2400 fireplace insert not with dampner closed ?

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Could be warm temperatures affecting draft, wet wood, plugged cap, lots of things. Was the stove running well a month ago? Have you checked the moisture content of your wood?
 
Was the liner cleaned right up to the chimney cap and screen?

By dampner, do you mean the air control? How well does it burn with the air control open say halfway?

Is the insulation blanket in place correctly, lying flat with the weight on it and not bunched up toward the rear of the baffle?