black soot

Sorry to be a little bit vague but I was cleaning my uncles oil fed rayburn the other day but cannot find where a angled bit of thin plate about 20cm long goes, I noticed it had fallen on top of the burner and retrieved it when I took the burner out, I put it to one side thinking I'll find its...

My oil boiler is producing black smoke and soot. Didn't really notice it but as its on more it's pretty clear and getting everywhere. The soot has been fine but last night it produced relatively bigger chunks for a period, now they're back to small. I have a service booked for Tuesday, does...