Quote Originally Posted by Algynon View Post
If you look at the underside of the boiler you should see two valve handles amongst the piping. Open one and then slowly open the other one, watch the gauge and the indicator should begin to rise. You only need to get the indicator a little way into the grey as you do not need the pressure to be high, between one and two bar is sufficient. Hope this helps.
I should have added that you must close both valves when you have raised the system pressure