you will need to open the filling loop usually under the boiler two valves attatched to a braided hose attatched to the cold pipe and the return.open one side then open the other slowly raise it to just over 1 bar.then SHUT both valves off.
deano
October 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.