URGENT Grant Combi 70 MK2 won't fire

[SJB060685]

I meant 'burner', obviously.

I know, I just always find it funny when people refer to it as a blower

 

[SimonG]

Because I wasn't certain if it was operating properly and I was trying to get this done quickly - it's a holiday cottage (currently being let as well) and I do all this guy's properties but this is the only one with an oil boiler.
I have to repair it every year without fail.
Besides - I had a spare burner just for this sort of situation anyway

I was wanting to know what the original problem with the burner was.
So the spare burner, is it brand new?

 

[Robert Tyrrell]

Thanks for the assistance guys:

Simon G - The spare burner is brand new - straight out of the box so I really don't think that there's a problem at the burner end, and as far as I can remember, it does have 230 at the live on the control box so I think it's more than likely to be the controls. I just can't work out where because it's been running as it is for years - although I have been called out to repair it nearly every year since I took it on in 2016 (and service it as well btw).
It has a remotely operated heating stat as well. I'll have to look at where that's plugged in and check the link between 2 & 3 as Chuck mentioned.
I'll have to take all this advice with me on Friday when I go back

 

[SJB060685]

If you have 230 volts at the control box then the fault has to lie within the burner. Power is only sent to the burner when theres a demand and stats allow it.

 

[Robert Tyrrell]

Update on this vexing problem.
I'm not really sure what happened but - I was on the phone with Grant support and the lockout light appeared. I pushed it and the burner fired.
I have no idea why it didn't do this before though and still don't although I have been through every terminal and link a few times so it might be that I tightened something that was loose. the neons still don't work either but I think that they've just expired and need replacing but they won't stop it working so I'm not in a hurry to sort that particular problem.

I now have a new problem with the burner in that there is no oil getting to it.
I do think I know what the problem is though and I'm going back in the morning to check the tank filter. I might have to employ the suction pump to draw it through as well because it's almost on the same level as the burner and there's only half a tank of oil.

 

[SJB060685]

Start at the tank and move in methodically. Check tank strainer and any filters/fire valves etc to the flexi hose. Run a few litres off at the flexi to prove you have decent supply of oil to the burner. If you do then the problem lies on the burner.
The tank at same level as burner on a gravity system is not a problem, even if you have half a tank left.