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Wow. Thanks Ronob - I might not have the same thing, but the more I read the more I think this problem is starting at the header tank one way or another.

Several of the radiators burst one winter and were soldered back together instead of replaced - could this be leading to the electrolysis? We are very short of money but it looks like maybe this could be the culprit and we will have to save up to replace them (times are tough). They have...

So I may have an electrical problem in the boiler. At this point, what type of tradesman do I need? And can you say any more about what the problem might be? Some sort of short or something? A faulty earth?

Does it burn with a clear flame? I seem to be able to light the gas coming off the bleed valve of the radiator - I can hear it burning and feel the heat but see no flame (in daylight). This is getting very interesting! You might be on to something :)

Hmmm... I am getting big static shocks off the radiators - would that be indicative of a hydrogen problem? It dark now so I cannot try and light the exhaust. It is just a static shock I get from the radiator, as if I touch a radiator a second time shortly after I get no shock. Starting to...

Well I am sort of stuck with what I have got - I just wish I could find where the air is coming in. I will try a different plumber and see if that helps. So far it seems like nobody can find where the air is getting in. I am a computer programmer/electronics guy and I know how to troubleshoot...

Um - I have a sealed system?

I'm not sure how to do that, but if I ask my plumber will he know? It sounds feasible.

This did not happen for the first 14 years of it's existence, so I am also very worried about where or how the air is getting in.

Thanks. Would you mind elaborating on that? If I am armed with enough information I can take it to a heating engineer or plumber (not sure which I need).

Hi, We are plagued with a problem that our plumber seems to be out of his depth with, though he is a really nice guy. I am almost daily having to go to the water pump at the back of my oil boiler and bleed the air out as it gets airlocked. Two upstairs radiators are collecting an airlock...

Thanks for that. I am safe working with high voltage electronics, so should be able to manage a disassemble. I have multimeter to hand and might give it a go. The red button does nothing, there is no start up sequence of any kind, and maybe I might be in luck and it's not getting juice...

Looks like we will be putting our woolly jumpers on and going without heat this winter then unfortunately :(

Is it possible that constantly running oil has just been putting grit into the burner? How much does a new burner cost, and the pipe on top that is corroded/ (Roughly speaking, even within an order of magnitude - we are looking at the bank balance and thinking we might have to go the winter...

Hi, Firstly thanks for the forum and the people that take the time to answer - I do the same for a computer forum an realize it is free time donated. Our boiler is poorly maintained and has not been serviced in years. It is an outside oil burner and because we are short of money I have to...