under the boiler there should be a flexible pipe with a valve on one or both sides open these valves untill the pressure comes to about 1.2 bar on the pressure guage. then shut the valves.
please note depending on the location of the boiler the filling loop(flexible pipe) could be in the kitchen cubbard below the boiler.
cheers lee
lee
July 2009
You need to have the Boiler & system inspected by a registered Boiler engineer, could be one of many causes including expansion vessel Pressure Relief valve,
Leak on boiler AAV or Leak on system somewhere
www.gassaferegister.co.uk will assist you to find a registered engineer near you
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.