Boiler woes

Can anyone please help, I have a 10 year old Worcester Bosh 230 combi boiler. My problem is on the heating side. The pressure in the system when cold is 1 bar, but when the room stat calls for heat the pressure in the system rises to over 2 bar and the boiler cuts out until the pressure drops then comes back on , this process carries on all the time. The rads do get hot but you can tell by the room stat that its not satisfied.
Thanks
JH

Hi,

Sounds like your system is airlocked.
Do you carry out any work with it recently.

Thomas