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Buderus G115 stinking up my basement
So I just moved into a home with the G115 and everytime it fires up I can smell burnt fuel oil. Turns out someone had put a Beckett burner on it that was never spec'd for the unit, so I luckily was given an home warranty when I purchased the home and was able to get the correct burner installed at no cost (was shocked). I still smelled the smoke after the install but gave it a couple days to burn off any oil or whatever from the installation and it is still sending a little exhaust in the room on every start.
A little about my exhaust tubing: It was piped into a brick chimney and had the smell, I took down the chimney and installed all new flue pipe in the basement with one 5 foot length of flue at about a 40-50 degree angle then straight up with all-fuel Duratech maybe 18 feet, still had the same smell, I taped everything, still smelly. I don't believe it's the exhaust tubing, nor did any of the oil techs that have been out.
Anyone have any ideas as to what is happening here? Thank you in advance.