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Hi folks,

New to the forum and a total noob. Please be patient :).

We're in the process of moving into a newly renovated house. One of the renovation jobs was the heating system. We've had an unvented Warmflow pressurised system installed along with new radiators. We've been without heat or any water for almost a month due to bit-part work from the plumber who has apparently been very busy.

We were assured weeks ago that the heating would be on. Thankfully we were able to get it back on last Thursday. The plumber left before the heating was back on and I got my electrician to connect the newly installed Nest 3rd Generation thermostat to the boiler.

The heating switches on OK and the thermostat will click on/off based on the selected temperature however, the hot water does not work.

If I select hot water boost from the Nest thermostat I can clearly hear the clicking noise that would lead me to believe it is working, but the Warmflow pressurised system doesn't appear to be heating anything.

Our plumber assured as when he left that this would all work no problem. What is going on here? Is it something simple? The hineysell 2 port valve just stays at auto. Is it supposed to move when hot water is engaged? The plumber did mention something about a valve in the attic. I wonder is this left closed maybe? He said the Nest thermostat should open any closed valves.

I've attached a few photos of the install. If I'm right, the valve to release air/steam is connected to a pipe which points to the ground. This means water would just empty on the floor. I thought this was supposed to release somewhere outside the building? Appreciate any help you can provide. Our plumber said he won't be back until next Wednesday to finish off one or two things. Could really do with this on ASAP as we were looking to fully move in any day now. Its been well over a month now. Thanks all!

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Thanks. I stuck my head up and thankfully no sign of any water or leaks. I just don't understand why the pressure dropped to zero and all the banging and knocking noises started. I guess there is just a lot of air in the system. Might bleed all the rads again. We've had to do that a few times already as some of them weren't heating that well. Thanks all for the fast replies!
 
Hi folks, several months on and the heating system seems to be behaving itself now. The needle hasn't budged below 1 which is a good sign I guess. Only thing we notice now is a knocking noise coming from the pipes (I think) in the ceiling. This happens every 10-20 mins or so 24 hours a day. It's a little annoying and is less noticeable since we got the loft insulation installed. Any ideas what this might be? Thank you!
 
Are the said pipes in the loft ?
 

I would say the insulation is pushing down on the plastic pipe causing it to be touching the joists / rafters and thus causing your noise

They need clipping
 
I would say the insulation is pushing down on the plastic pipe causing it to be touching the joists / rafters and thus causing your noise

They need clipping

Thanks. The noise was there before the insulation was put in but I think you're correct. None of the pipes appeared to be clipped down. At least when I was in the loft I didn't see them clipped anywhere. I may have to have another look. Would have expected this done as part of the heating system install mind. Thanks for your help!
 
Yea and that's why the noise is louder as the insulation is pushing them down into the timbers
 

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