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[Field Marshal Dr. Opti]

have you checked the nozzle for any signs of oil?  if dry then it sounds like a fuel issue ( pump or solenoid)

pump - you can check it is reaching pressure with a cheap ~10 quid pressure gauge

solenoid - check the resistance - open circuit - suspect the solenoid

typically there are diagostic flow charts on line for whichever burner you have so have a look for that and follow it - oil burners are pretty basic tech so not hard to diagnose tbh

I've pulled the unit out and cleared the 'back box' (no idea if that is what it is called) of soot. Removed the nozzle which appears black and blocked and have left it overnight in white spirit. I'm hoping it is this that is stopping ignition if no fuel if getting through.

I will also adjust the igniter tips that should be set 3mm apart, and level with the top of the nozzle.

[Field Marshal Dr. Opti]

Didn't even occur to me. Would this work?

YouTube seems to think so.

https://youtu.be/uBZ7NIEEvck?si=RsJt0OTwc-akTvJI

It might be useful to know what the values should be. But given the age of boiler, I suspect it won't be that precise.

 

Thanks Jimmy.

The photocell is easy to remove so I'll give it a try.

My photocell is the same as the second on in your video, only longer. Mine appears to be 80mm, the one in the video looks 40mm.