Make sure the filling loop is connected at both ends. Some have valves at both ends, make sure you open both of them. The pressure guage is rubbish on the compact. You should see a small blue ball. When this gets above 0.6 then the boiler should work. 1.5 is normal for most boilers. If the pressure is ok and it dosnt run then you will have to include more info to diagnose it.
kenneth
October 2006