Roaring noise from central heating

[briffobear]

Hi,
Just had a new condensing combi boiler fitted and had the system flushed and cleaned. (It was full of sludge!) Heating is now working well, maybe a little too well.
The issue seems to be a constant roaring sound heard though the pipework in the rooms above the bolier cupboard. Any thoughts on how to either damp the noise down or stop it? Sounds like the roaring of a waterfall. Thanks.

 

[doitall]

Get the installer back.

 

[briffobear]

Thanks. Just for further info, what is the likely issue?

 

[doitall]

No idea from the information, but it could be pumping over.

Need more info about the system.

 

[muggles]

Pumping over on a combi DIA?

 

[doitall]

Pumping over on a combi DIA?

Sealed system full of sludge muggles.

I can buy OV combi boilers.

As said no information.

 

[muggles]

I know it's possible to do an OV combi (I'm an Intergas P5 installer..) but the chances of it being that are pretty small, I'd say there's far more sludged-up sealed systems out there than there are OV combi installations. You're right though, more information would help here