Message posted by arc systems on 12/2/2014 at 11:02pm
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My problem is I don't think it is the thermocouple, more likely to be something wrong with the pilot flame than the thermocouple itself.
Also, the thermocouple has a 'cold' end that screws into the bottom of the gas valve, it's an 8mm brass nut, check this is clean and nipped up tight as dirty/loose it won't be making a good electrical connection.
As for changing, as I said very much doubt it needs changing, so 'seeing' what actually is wrong requires someone familiar with what their looking at, as well as how it all comes apart and goes back together exactly how it is supposed too, including the flue seal?!
As for fairy liquid, problem with this again is how it's used, but used right I defy any posh/expensive micro bubble leak detector to find a leak any better than it can.
Same as using a naked flame, it's not so much why you might think?, no, it's because it won't find a tiny leak rather than it obviously causing a big bang from a larger leak!!