it may well be the pressure release valve that has not reseated you can try opening it manually by turning it till it snaps shut if this does not stop it running you will have to replace it....or does the pressure keep rising when you have heating on till it reaches 3bar? if so then your expansion vessel has gone you can either fit a new one but this will mean taking boiler off wall to do, then refitting, or you can fit a remote expansion kit as close to the boiler as poss. on the heating pipework, if it is the expansion vessle i really recommend tha you get an engineer in to at least get advice. good luck
sean, July 2007
