Recently purchased a used 6041. On first fire up I had alot of smoke in the firebox before ignition.......Burned ok...but kinda lazy flame.Then shutoff and showed "Err-2." Per manual was checking the door gasket ( which was ok). I dont understand why no seal/gasket on the ash drawer. Anyone know where combustion air comes from.?? No OAK as of yet. Seems to be some kind of an air flow problem. New pipe, 4 foot verticle with just 1 90...so that shouldnt be a problem. Any thoughts /advise appreciated.