Groaning noise???

[Dizzybird]

Hi all,
I wonder if anyone could advise. We have recently had some radiators removed to have some plastering done & at the same time we started getting an occasional groaning noise coming from the boiler/pipes. The radiators have now been replaced and the noise has got worse .
We thought it may have been the boiler but if you switch the boiler off you still get the noise. It's a Halstead Platinum boiler - 3 years old.
I know I'll have to get someone in to have a look, but please could someone give me an idea of what it might possibly be? Is it likely to cost loads or could it possibly be something simple?
Thanks for reading.
Dizzy

 

[Dizzybird]

**bump**

Is there anyone out there who can shed any light on what the noise could be?

Thanks in advance.

 

[sparkieno1]

Could be air in the system,try bleeding it if you haven't already.

 

[Dizzybird]

Thanks for replying
We've bled all the rads and they don't have any cold patches, but it's still making noises.

 

[lkuya]

can u tell were about exactly on the system the noise is coming from?

 

[bengasman]

The noise continues when the boiler is OFF????
Either a poltergeist of you have forgotten to tell us something.