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I had a similar one with a sterling burner, as previously said I would have gone for the transformer. After the 3rd visit it turned out to be a ht lead partially blocking the photocell. Could have kicked myself for not checking first time
I thought on the ht leads & checked them when I examined the electrodes for cracks. The ht leads are a bit long but are folded away from photocell. In fact, I checked & thought just about everything. The boiler hadn't been touched & suddenly started this locking out. Nothing I have done has made any difference. I am happy to replace the transformer to test, but old one seems fine. I have been wondering if something is wrong with oil pump or it's stem, but this burner is only 3 years old & mechanically would normally be very reliable as you know.