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At last - sorted... looks like it was the transformer... so down over £300 on a 30 year old clunker and just waiting now for something more to fail. My bad decision to go down the repair route, I suppose. How in the name of fook can transformers fail? No moving parts to ge wrong - only wire and...

Thanks SNB - brilliant = it even has the same ignition controller unit as I've just bought and replaced on the old clunker (Satronic TF830B). So I suppose I have a new Potterton timer unit now installed and a spare ignition controller if I was to go for that option. Still, makes feel a bit of an...

Thanks Terrywookfit - yes I'll try to test it in situ first, but I'm just looking ahead, and if the pro engineer who skuttled off with the opinion that the transformer was forked and a replacement couldn't be sourced turns out to be correct, then I probably would need to graft a new one in...

Thanks SNB - I think you're probably right, but I'm already a couple of hundred pounds down on this f'ing burner and it just seems to go from bad to worse - throwing good money after bad...Once you start progressively replacing parts which then turn out to be the wrong parts and not needed, then...

Thanks Oilman - yes, I can get about 7cm if I pull the transformer up and draw the attached HT cables through the glands, so there should be enough to play with if I need to put a new txfr in and cut/join the output cables.... I'll test it properly before committing to a new one though

Thanks Oilhead.... easy enough to release the TXFR from the burner, but the 2 output lines are glanded through the casing and the transformer seems to gave some kind of plastic moulded casing enclosing the internals which isn't removable... see pic. Am I just being thick on this. I really didn't...

Thanks Oilhead - seems easy enough. I presume the electrodes will just spark once, on initial re-connect of mais supply to TXFR? Or will there be a pesistent 'arc' whilst the power is connected? If no spark, could it not point to faulty HT leads or even dud electrodes?? I'll give it a go...

I think I'll be out of my technical comfort zone even separating the TXFR from the burner...Also looks like 2 secondary outputs and one primary. The outputs lead through the burner casing and no easy way of detaching them without pulling the whole unit to pieces. And if I do that it'll never go...

OK Terry - I can drive a multimeter, but I'm not sure what to look for in testing the TXFR - is it just a continuity check on the primary and secondary windings or do I have to energise it on a mains supply and check output levels? I changed the other parts because the initial problem presented...

OK - managed to track down a reasonably priced supplier of the Ign Transformer - Greek (!) company called Kestakon in Covent Garden. Any knowledge of them? My big dilema is whether to spend another £100 on yet another part for this old clunker of a burner, or whether to replace the whole unit. I...

Thanks guys - pic of burner attached; upside down of course, but showing the faulty(??) transformer. I'll have a look deeper in to see if I can run a test on the txfr and check the HT leads... Having already spent so much on the new Potterton timer and the new Honeywell Ign Controller, which...

Hi = new here and come in desperation for help please.... Old Trianco 28/32 oil boiler playing up and now not igniting. I've spent a samll fortune replacing the time controller and the ignition controller, but still no spark in start up sequence. Relay closes, but burner faults out to reset...