hi yes plumber here what you need to do is find the filling loop to the boiler if you have one and repressurise the boiler to 1.5 bar pressure it should be aflexi pipe somewhere under the boiler with tap valves on bothends
  If no luck phone me 07932750470 Mel
                
 Melvyn Peter Cockell melplumbing@hotmail.co.uk
                
 October 2008