New closed system losing pressure

[Eileen]

We moved into our refurbished 2 bedroom house 4 weeks ago. All the plumbing and eating is brand new. There is some wet underfloor which is behaving well. There are also 9 radiators which are less impressive.
The system has completely lost pressure 4 times already. The radiators need bleeding every couple of days.
The pressure is set at 1 Bar. In a previous house when I topped up the water I just waited until the system was full which I could tell when the sound of the water flow changed. I'm obviously no expert, but I just sense that the system isn't actually full. The radiators also make an incredible noise when the heating fires up. Doesn't help that the top up tap is in the attic. Grrrr. Plumber who installed it all is scratching his head and trying to figure it out. We are 99% sure there isn't a leak. All advice greatly appreciated.

 

[ShaunCorbs]

You do get a drop on a brand new system due to all the air, sometimes can get trapped etc

But he should of done a pressure test to prove the system was sound when he has installed it

 

[Scott_D]

Post some pictures
What boiler do you have?
Is there a pressure relief pipe outside? Does it drip?

 

[Eileen]

The system was pressure tested and there was no issue. It held pressure for 2 weeks. The problems started when we turned on the heating. I do think there is a lot of air in the system. Will have to find out about a pressure relief pipe. Happy to post pictures, but not sure what of ??

 

[Chuck]

Happy to post pictures, but not sure what of ??

Newly installed and filled systems do evolve significant amounts of air and hydrogen for a couple of months after installation. This is not usually a problem providing the expansion vessel is correctly sized, filled and in good order, the system was flushed properly, dosed with inhibitor, the pipework doesn't have any 'inverted Us' and there is a an automatic vent at the highest point. The householder just has to top up a few times until things settle down.

The fact that you are having to bleed radiators frequently suggests to me that one or more of the items on my list has been overlooked.

Post those pics and let's go hunting...