Recent content by DoctorNick

Hi DortechDirect, etc, Gosh, this thread was originally from 5 years ago and reminds me of how long we have now been in our "new" house. Hence, maybe it is time to give an update. Good advice re the pro silicone, so worth knowing. I did go and get some neutral cure low modulus silicone...

Hello guys, Thanks for the suggestions. I have always just bought general purpose silicone sealant (usually from Wickes). I was not aware that there were these different types. However, some googling showed my ignorance. Screwfix have low mod neutral silicone on special offer at the moment...

Hello all, I was sure that I would find an answer to this on the web somewhere (quite possibly on this site). However, so far I have not. Silicone sealant is nowadays used universally to seal around uPVC doors, windows, etc. However, certainly when I have used it, no matter how carefully I...

I too saw the other posts and it may be a problem with the diverter, but I want to check out the PV as the first main contender. I didn't get any air in when I "bled" the PV (due to my ignorance), since I stopped when I got a little water out the valve. All the air got in when I depressurised...

Thanks for asking. I think it is about the same as it was before I did anything. This leads me to conclude that the PV membrane is probably ruptured (I did get a bit of water out when I "bled" it). I also got air into various rads when I recharged it and I would not have expected that. I...

You could well have just cooled the loft space with the new insulation. If you have any damp getting into the loft from the house (there are lots of ways damp air can get from inside the house and into the loft), then inadequate ventilation will cause that moisture to consense on things (and the...

I was wondering if the diverter was the problem right at the outset. Still thinking that the PV might be the problem though, since I got water out of it when I "bled" it (by mistake 'cos I didn't know what I was doing!). I stopped when a small amount came out, so I don't know for sure if the...

Job now done... Result... With the system cold, I drained off 9 and half L of water from the system and pumped in air to the expansion tank until the pressure inside was 0.75 bar (Vaillant spec). Repressurised the system to 1.2 bar using the filling loop and then switched on. The system...

Found the FAQ on expansion vessels, so understand them now.... Been used to open systems before. I was not planning on fiddling with the diverter. if there is something actually wrong with the boiler, it will be a service call out. I don't mess with that sort of level of work; just simple...

Sounds like you'll have a head tank to keep the system topped up with water? This sounds like it is *not* a sealed (newer) type system. You'll need to turn off the mains supply to the header tank. I would let it drain down when you partially drain the system rather than try to stop it...

It certainly is not water hammer (cavitation caused by boiling in the heating vessel). It occurs immediately the tap is opened and the boiler switches from CH to DHW supply. Certainly it causes the pipes to rattle and I am sure that they are not all fixed perfectly. However, I also worry that if...

We have recently moved into a house equipped with this boiler. When the boiler is working quite hard (eg CH is recently turned on and heating up), turning on a hot tap results in a very distinct bang and vibration through the pipework. Once the boiler has changed to DHW mode, it operates without...