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Hi ollski, many thanks for the suggestions. Seeing as though the boiler wouldn't work without a functioning fan, if either the air pressure switch or the fan speed resistor were faulty wouldn't this mean that neither the hot water or the central heating would be working? (My issue at the moment...

Hi Ollski, many thanks for your reply. I completely agree, the PCB for this boiler is an obsolete part and the 350 has been discontinued (and hence, is very old) and throwing money at it may not be economically viable. However, I'd still like to understand why, seemingly, running the hot...

Thanks again, Tony. I know that is ‘ALL’ you said – I wasn’t having a go at you and yet again, thanks for your ‘help’. By the way, I am surprised you’re telling me that my spare PCB is ‘repaired’ and not ‘reconditioned’ and that you can’t get reconditioned PCBs – I’m aware that there is a...

Thanks Tony. Reading around potential solutions for the issues I’m experiencing, I dismissed the PCB being at fault for a number of reasons - but I bow to your superior knowledge in this area. By the way, I know you’re not saying ‘IT IS’ the PCB just that it might be the PCB considering the...

Thanks, Tony. I should have checked the rules before posting and asking such questions. (I don’t necessarily agree that it would be quicker and cheaper to get a pro out in the first place – i.e. no labour costs, I may be able to get parts (for a discontinued boiler) cheaper independently, I...

Thanks Tony, you’re correct – I am very dangerous. To be fair, I don’t think I’m replacing parts ‘willy nilly’, I am trying to think about the problem(s) and possible solution(s) and I’m also trying to get a better understanding of how the boiler works (i.e. I didn’t think the boiler could work...

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Update: the pipes are old, dead gas pipes. Gas board eventually came out and......hit the rotten one with a hammer ('that one's dead, mate) and cut straight into the other one ('no hissing, mate, there must be a plastic pipe fed through it'....bit more sawing....'this one's also dead, mate')...

Thanks for the CAT and genny idea. I'd never even heard of them before. I had a quick look at a hire shop and saw the complete set for around £70 - I may end up hiring it to get a better idea of where these pipes go. However, in the meantime.... Update: I've cleared a bit more soil away and...

Well, I did ring National Grid last week when I found these pipes. They COULDN'T confirm if these were live or even if they were gas! They could only tell me where the closest underground gas mains/junction was but couldn't tell me how the service pipes were routed from there to my meter...

Update: I've just been out there trying to dig a bit further to expose these pipes. I'm starting to think they're gas pipes....from the photos you can see a bit of yellow on the outside of the pipes which crumbles away when I touch it (I think I remember reading somewhere that gas pipes are...

I can't believe I'm gonna go out there and 'listen' to these pipes with a 'big screwdriver to my ears'....the neighbours will be wetting themselves!

Hi noseall, thanks yet again for your input. If these are indeed 'live' and given the choice between them being water or gas I'd much rather they be water as I'd at least be able to turn of the mains stopcock and re-route them as appropriate. (I'm just really hoping they're not gas!) (Hi...

Hi, just an update about these mysterious pipes....they are NOT lead - they're not shiny underneath after scrathing the surface and one of them is somewhat coroded (see photo). Can I therefore assume these are NOT water pipes? (Could they still be gas/electric? Excuse my naivety on these...