Hi Stuartt did you ever get to the bottom of this problem? I have a customers burner doing exactly the same. I changed the fuel pump because it was leaking past the seals and it came with a new solenoid. Set pump at 100psi and no change to sooting smoke from burner. Definitely running rich. renewed nozzle as a matter of course and cleaned out combustion chamber. Tried a new photocell which I carry on van but no difference. Time was running out so I will have to return but I'm a bit confused on this. Maybe you can help?
Conventional Flue and changing the air setting makes no difference to smoking although restictiong the reading to 0 as opposed number 9 makes the burner quieter.
regards Jim
Conventional Flue and changing the air setting makes no difference to smoking although restictiong the reading to 0 as opposed number 9 makes the burner quieter.
regards Jim