I have an Englander pdv 25 . It’s controlled off of a wall thermostat . I got the stove for free . Upgraded draft motor to Gleason Avery . Basically went through the entire stove . Problem I’m having is after running over night . I get that pile up of Burnt pellet lava . Stove is cleaned every week with brushes and a leaf vac . I have used different brand pellets . I still have same issue . Stove is set at 6 4 1 . I also blocked side holes in bottom of burn pot . Then removed plugs . Still no difference . My only thought is the stove isn’t designed well to run on a thermostat. Pile up might be caused by stove idling up and down . Any help would be appreciated