I need advice on buying a control box for an oil burner.

I called out a boiler technician a few days ago. As suspected it was the control box that was the issue. He replaced it with a secondhand one and it's back up and running. He didn't service it. He recommended replacing the boiler as it's so old and basically just burning oil. Thank you everyone for your advice.

He was saying you'd save a tank of oil a year with the new boiler. And that you'd make back the outlay in 2-3 years. I think it would be a bit longer than that. But I do know the new boilers are way more efficient.

The system acted up again. This time there was no power at all. Just a light humming noise. I checked the control box and the magic eye, it was filthy. Gave that a clean, still nothing.

You can see where it's blackened. I unscrewed cap on the thermostat and pressed the reset button. That brought back the power. But I wasn't going to run it given it shut off and the soot marks on the casing.

I opened it up. The plates were absolutely filthy. I started cleaning it and after a few minutes I took a few photos just in case.

There was layers of ash and baked on layers of crud top and bottom. I thought you can take these out, but they weren't coming easy, so I cleaned them out in situ. The circulation inside must have been awful. I couldn't get to the vent at the back but doesn't seem to be the issue.

I disconnected the burner as well, and cleaned out the ash deposit at the bottom. Put it all back together and ran it for a minute. It seems fine. I'll know when I run it proper when it's cold.

A few questions though. The technician was out before the first time it broke. He recommends getting a whole new boiler. I think the quote was around €3,000. Would that be about right? What about just getting a new burner? That I think is around €320, that's what the plumber said at the very start.

The technician said he can replace the boiler in a week or so. I'm waiting on an exact quote. Should I sell any of the old system or ask him for a discount against the new system? Is anything there worth any money? As the saying goes, one man's rubbish is another man's treasure.

No, I'm going ahead with the new boiler. As I said I'm waiting on the exact quote. But I'm wondering is there anything I could do that wouldn't require replacing the whole system that would make it not "dangerous". I think I know the answer to that. But €3,000, would anyone know if that's in and around the ballpark?