To all who replied, thanks a million for the advise you all gave. It was the EV, got a bike pump to it and put in 1 bar and it seems ok at the moment, even if it slowly looses pressure I know I need to change the EV to rectify.
Thanks again!
Andy
Need help!! - heating goes on and the pressure goes to 3bar and sometimes blows out of relief valve, when its turned off it drips from relief valve until all pressure is lost and low pressure light comes on.
Have replaced relief valve and its still happening! - any ideas?
Andy