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bell824 - Well, yes, I do now quite see what you mean about aiding and abetting! Oh dear, to live in a lawyer free zone. And you're probably right about letting somebody else do the worrying. It's just that I've been there, albeit in a slightly different landscape and some time ago, and it...

bell824 - Apologies, we are at cross purposes! The O ring I referred to is item 35 in diagram 08 Connection parts (Hydroblock) in the Vaillant spares catalogue for the 824E, clearly a water seal, but you are referring to the grommet, item 37. Also, it doesn't help matters that I'm writing all...

bell824 - No, I don't think I missed the point of it at all. It said, essentially, GAS! - leave it to the professionals. So, reasonably enough, I referred you to the announcement at the head of the P&CH Forum and made clear that I intended only to work on the water side of things. But I am...

Dan_Robinson - Thanks for the incredibly witty and perceptive comment. Tremendously helpful! ChrisOxford - Thanks for the reply. I think that's right, although I'd tend to favour switching off the cold mains as well as the radiator feed & return! That's three valves to switch off. Can't...

Thanks for the reply. If you go Forum > Plumbing & Central Heating > Announcement : DIY Gas, you will see the following "Water carrying parts of a boiler unrelated to gas or airflow, can be worked on without gas training, though you still have to be competent, for example electrically." What...

Just moved in to a new house with an 824E combi boiler and I'm sure its pressure relief valve is faulty because the cold pressure has dropped since moving in and water slowly accumulates in the plastic bag I tied over the end of the discharge pipe, outside, to check. Although a competent DIY...