Well i installed my Harman P43 today and have been burning since 7:30 tonight. Works great its now 75 in the house. I have noticed a lot of build up or ash on the ledges and bottom of the stove is this normal? I had the feed setting at 4 thats what the manual says but now i turned it down to 2 dont know if this is right....I am totally new to this any help would be great.