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I would (and have done in the past) make a diagram of all the wiring in the system from the incoming mains connection, programmer, thermostats (room and tank), motorised valves, boiler, pump and any wiring junction boxes, etc. Then study it until you understand what's going on, then the required...

Thanks Agile Perhaps you're right - the one thing I'm sure of is I'm fed up with it! And the neighbours too. So far we've had the Landlord's guy - a bonified heating installer with all the badges but not a Viessmann expert and the Viessmann supplied contractor (as it transpired it's still in...

Hi Agile, No it has been serviced and is certified, etc. Landlord's heating guy wanted to condemn it as he couldn’t get the combustion correct. Since then the Viessmann guy (actually a sub contractor) has been at least three times - one of the things he has apparently done is update the...

Also, forgot to mention - system seems to be losing pressure quickly needing a topup from the mains to get to 1.2bar every few days. Is that likely to mean whatever internal pressure vessel the boiler has is shot too and could it have any bearing on the noise problem?

Update - I've now had several visits from a Viessmann engineer, the F5 issue appears resolved and the engineer is adamant it won't reoccur, I guess this is down to the flap being replaced as I found the old one on top of the boiler. But it's still deafening the neighbourhood with the high...

anyone with more experience of Viessmann? Thanks!

I'm in a rented property with a Viessmann Vitodens 200 boiler which I think was installed in 2005 - it's driving me mad (and the landlord too!). As far as I can make out this is supposed to be a great bit of kit but it seems to have unsolvable faults. I moved here in June, there were problems...

I've got a white plastic 15mm service valve that is leaking from the valve centre and will need replacing. The valve has a small oval quarter turn handle - does anyone know what make this is and whether they are still available (it would be about 15 years old)? Or am I better off replacing it...

Sorry. probably a bit late in the day, but I was thinking along the lines of a self tapping screw too, but wrap it in PTFE tape if you've got any lying around. Just make sure you wrap it in the right direction so screwing it in pulls it in. ie anti clockwise as you'll tighten the screw clockwise.

Sorry, 15mm, shouldn't be a problem even with a rubbish torch!

What size is the fitting and what sort of torch are you using? If it's a cheap DIY type torch and the fitting is 22mm or larger you might struggle to get enough heat into the joint - I learnt the hard way when I tried to heat my first 28mm end feed with a junk torch, got there in the end but...

Hi chrisR These valves were in place for 15 days, yes they did quieten down a bit, but not fully. I think from your posts you're a plumber by trade?? I'm not, I just read the books , and over the years have done numerous jobs for friends and family which, without wanting to boast, are...

Eventually tracked down Kuterlite K424 15mm single check valves at Pipe Center - 2 off obtained! Have just spent another afternoon redoing the job again (had to cut out all the 15 day old pipework as there wasn't enough space to make new joints!), all finished - problem solved!! The moral...

Because when you hold the SCV when then tap is on (as Baldrick might say) it's vibrating like a vibrating thing!!! Typing this upstairs now, someone just turned the tap on, it's horrible! The service valves are the same ones that have been there for the last 12 years, can't see how they'd...

Hi, what did you swap it for - a branded one? My problem isn't just a rogue valve as both do it (unless the whole batch is defective!). Ideally I wanted Conex followed by Kuterlite but I'm not too sure where to source these these days - any ideas. Cheers

I’ve just spent all afternoon fitting a Damixa Saturn kitchen monobloc tap in place of an old monobloc tap. The plumbing system is cistern fed low pressure hot and mains pressure cold. The old monoblock keeps the hot and cold separate until the water emerges from the outlet, the new Damixa tap...