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Well from all your posts and thanks probably alot me than me! Anyway my logic at the moment is that I am on the original nozzle and pressure of the original burner so as much as I have unwanted smoke it should not be hitting the back of the box? I accept its sooting up which is far from ideal...

The original that had the motor bearing failure after 25 years was the .75. I think I have an old .8 off it in the box somewhere. The X-500-2 came with 1.35 which was fine but too powerful for the casing and I could not get the 1.0 they recommended to work but that was early this year before I...

Thanks, point taken on money but I went down this route as ripped off by two professional registered firms in 3 years. It was running fine after the Guv of one firm set it up 5 years earlier and I was talked into a full service having reminded them untouched for 5 years with them to discover...

More good progress as no oil fume smell in the house this morning so just a case of not running at peak efficiency now as the EA Excess air is about 50% when I believe it should be nearer sub 20% so heat is being lost up the flue. Thanks to you it has led me to a website which puts all your...

Update! I now have O2 of 6.6% EA of 46.9 but I don't understanding this figure at all, CO2 of 10.6% and OAT of 5.8 oC but my smoke content has increased from low one to a two so clearly a long way from "no smoke" so what compromise of tuning do I now need to make?

Clearly not perfect yet. I have just done a smoke pump test and that is indicating just over the one at the moment but well under the two. Will go out and try to match your figures with a bit less air.

Thanks for that. I THINK I have made some good progress this morning. I clearly had it very wrong on the 1st Nov when I set the 150 psi, I do have an air heat pump as well (primary source) so the oil boiler was not working very hard at that stage (kicks in 20 min after AHP if it needs help)...

I ended up at 150 as at lower pressures it was worse and I wondered if I was having at attomisation problem accepteing you would not normally exceed 140 psi with 28 second oil. The manual says with this burner you should be able to get down to 11% so I assumed 12% was quite good as no doubt...

I am going round in circles a bit and its getting really frustrating trying to find what I have wrong! I have a 25 year old Thorn Panda 120 oil boiler and put a new EGO 500? burner on last year but this year having thought it was set up properly the fumes are smelling. I got a 12 % reading and...