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No, that's the engineers fault since that pipe wasn't leaking until the engineer unscrewed it. His action of unscrewing it literally caused the new leak. I actually saw him unscrew that area, then a gush of water sprayed out and he quickly screwed it back - right at the start of the job. He...

It's the connected pipe second from the top, you can even see a small drip of water forming there about to drip behind the screw.

Ok I'll try and get a picture soon.

My mistake, read it wrong from the diagram. It's actually the "Cold water Mains Inlet".

I can see the exact place it's leaking from is the CH RETURN pipe, underneath the boiler. The engineer didn't tighten it properly before he left so that's his fault and he'll have to correct his mistake. I've actually tried tightening the screw and it's now reduced the amount it's leaking quite...

How would you account for the noises suddenly appearing straight after the repair? It was nowhere near as noisy before that, although did bang once in a while, possibly a couple times a day. But now it's probably once every 10 to 20 minutes, and this happened immediately after the repair. There...

Other than the fact it's still leaking now (but from a different place) another problem I've noticed since the repair is that the boiler makes a lot more "banging" and metal "clanking" noises than it did before. I read something about kettling might be the cause of this because there is...

Don't know if I should make a new thread about this but I had been away on business two days after the repair was done. Luckily I left the original bowl under there which was collecting the water from the diverter valve leak. Great news - the boiler is still leaking. Seems to be from the CH...

"Flow rate" sounds like a good description. The water just doesn't flow out of the taps with the same vigour that it did previously - especially noticeable with the hot water. I did notice the engineer was fiddling about with a screwdriver underneath the boiler. I don't have a radiator bleed...

The engineer remarked that "there is no filling loop" at the time the work was being done.

I don't think it was touched. I remember asking the engineer about the stop tap just at the beginning of the job because I noticed that he dived straight into the work without touching the stop tap. (In my uneducated analysis, I thought this would mean that water would gush out of the Diverter...

I recently had an engineer over to change a Diverter Valve. Noticed now that the hot water pressure is much lower than it previously was before (prior to and also during the Diverter Valve leak). The engineer also bled the radiators at the time - I think 3 of them were affected by the trapped...

It's funny you mention that because that's along the lines of what I mentioned to the engineer when he installed it yesterday morning.

Well the owner of the company said that brass is better, and so did Agile in his post above. Are you saying plastic or brass is the same? Thanks for your evaluation of the call out and repair fee, that's good to hear.

That looks like it's exactly the same part with the same part number. But, the only strange thing about that site is that if you click the image of the DV to enlarge it, it displays a blurred image which means you can't examine it very closely (and they could, in theory, send you a knock off...

Thanks for all the responses guys, I just spoke with the owner again and I'll go ahead and get it done. He is a genuine guy, gave me some detailed explanations about the issue, talked for half an hour and actually gave me the link to where he got the part. Well that helps put my mind at ease, I...

I was a bit unsure of their charging structure as I assumed that the initial £88 + VAT (£105.60 inc) would cover a whole hours worth of work. The engineer was only here for 15 minutes to confirm that the DV was the problem. The thing is, I had already told them over the phone that the DV was the...

Update about my thread re: leaking Diverter Valve here. People might not go through the 40+ responses in that post to read this so I made a new thread as it's a slightly different issue. Plumber came around yesterday and is quoting over £370+ to replace it with a brass original DV from...

Hey fellow aspiring plumbers, are my eyes deceiving me or does this installation guide have everything else but how to change the Diverter Valve? http://www.vaillant.co.uk/downloads/ecotec-installation-servicing-2009-261448.pdf

Thanks for the info Wull, I'll most probably try to book an engineer tomorrow.