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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.

[Field Marshal Dr. Opti]

OK....so following the advice of Jimmy the Photocell seems to work as it should regarding light and dark.

I've turned the burner around (so it is facing outward) and I can now see there is no spark at the igniters. So some progress.

 AI for no spark throws up burner control box....possible HT lead failure, ignition transformer fault.

Take your pick.

[TheBoy]

touch those bits with a licked finger. You will soon know by the bit that kills you which is faulty

[Field Marshal Dr. Opti]

touch those bits with a licked finger. You will soon know by the bit that kills you which is faulty

For a moment there I thought you were talking about wet fanny.

[ronnyd]

touch those bits with a licked finger. You will soon know by the bit that kills you which is faulty

For a moment there I thought you were talking about wet fanny.

If that's the way you want to moisten your finger, that's your prerogative. 

[STEMO]

touch those bits with a licked finger. You will soon know by the bit that kills you which is faulty

For a moment there I thought you were talking about wet fanny.

If that's the way you want to moisten your finger, that's your prerogative. 

Yuk. The smell of burnt fish.

[Kevin Wood]

I've turned the burner around (so it is facing outward)...

  Good job there was no spark or you'd have had an industrial sized flame thrower to deal with.

[Sir Tigger KC]

I'm just waiting to see the headlines.....

House Explodes In Lincolnsausageshire!

    

[STEMO]

I'm just waiting to see the headlines.....

House Explodes In Lincolnsausageshire!

    

At least the orangery won't go up. 

[Field Marshal Dr. Opti]

I didn't stand in front of it....

[Field Marshal Dr. Opti]

Anyway, I'm a bit like Niki Lauda, who according to James Hunt was better looking after the fire than before.