Grant oil boiler problem

[Red One]

Any advice welcome as plumber stumped


Had 36-46 grant vortex utility boiler 7 years no problem recently oil tank move and tigerloop install (tank about 1m lower).
10 days later and boiler either doesn't fire or fires stops, fires runs splutters stops. Most it runs now is 10 mins, but that's rare. Usually it doesn't work.

Changed control box, photocell and I think oil pump. Still the same.
Tigerloop appears low to me (10% full, even lower than when pic taken). Oil tank 1/3 full and "fuel lines ok".

Also around same time hot water overflow started to drip, expansion tank empty, recharged.

Pics and videos attached.

Any ideas?

 

[exedon2]

First find a oil engineer that can fault find rather than throwing parts at problem.
Assuming the problems only started with conversation to tiger loop?
Simple stuff is oil filter clear? Pipework to tiger loop correct? Bypass screw fitted?
No pics!

 

[Red One]

First find a oil engineer that can fault find rather than throwing parts at problem.
Assuming the problems only started with conversation to tiger loop?
Simple stuff is oil filter clear? Pipework to tiger loop correct? Bypass screw fitted?
No pics!

Thanks. Will probably end up with an oil engineer, plumber (oil engineer?) is still on the job.
How do you know an oil engineer is an oil engineer 🤔

I assume uploaded pics need admin approval first and maybe that's why not posted?
Or is there a size limit to files?
I asked about bypass screw, he said yes.
Filter new.

 

[Red One]

Will try to upload pic again

 

[Red One]

Will try to upload pic again