We had a new oil boiler fitted (Worcester greenstar heatslave 18/25)in jan this year (2009), occasionaly their is a loud bang which comes from a radiator, this isn't the same rad every time. The system was flushed twice before the new boiler was installed. It seems like an airlock because the bathroom cold tap when turned on runs then bangs and loses the pressure. if turned on slowly the water seems to run ok. How can i get rid of the airlock or do i get the installer back to flush the system again?

Stuart B, October 2009

I have replaced both valve and one radiator which was hotting fully and the new radiator still does not heat up, Tried to balance the rads, does'nt work, switched off all rads from flow & return side except one, it still does not heat up, please help

Abid, February 2010

Put central heating on full on.then take air out from radiator start from near to boiler radiator.you have to do this every 1/2 hour until all air come out.

Manoj, October 2009