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Fit link as photo.

Try dropping oil pressure to 8 bar and reducing air shutter for clean burning. the soot is unburnt fuel probably caused by impingement..

Less load is less gas What do you expect to happen.

Are both pumps running and M/V s open when there is a demand?

'85 @ 12 bar is about 40 kw input. so waaaay over gassed. check burner rating on data plate .head settings etc. could be wrong burner. what smoke no is it ? FGA readings ????

Is there a relay to allow the boiler and pumps to run independently.

He means checking if the coil is producing a magnetic Field. A steel screwdriver will hang for a few secs. Coil resistance is a few K ohm.

28 or 35 sec fuel, boiler model and output and nozzle sizes . FGA readings

Un plug the burner to eliminate external faults

RDB burner then, At which part of the ignition cycle does it trip? Unplug the burner from the control panel to check if wiring or burner fault.

Which boiler do you have??

Remove the oil pump and check for tight spots when rotated also the motor.

If it was watertight before the new roof and leadwork then why should it need a tray now. I have Fitted liners to and relined with " Isokearn" hundreds of flues. I have never seen a tray fitted.

The EBI can sometimes give intermittent spark. I usually fit a new one from van stock and see if it cures the problem !

are you keeping the cell in the dark,

Try both of them. I love to see a well maintained boiler.

solenoid coil.

I was under the impression that an EICR Was like a gas safety inspection, ie A report on the installation as found at the time of inspection Not a pass or fail,

Obviously not !!! As there is water ingression !!

I see no video