Boiler pressure?

[dragondraig]

Hi there,
I have a Saunier Duval Xeon Condens 18 which is in my new house. The heating was working fine until the plasterer removed 1 radiator to work on a wall. He put the rad back on but the system a week later won't fire up.
Any ideas - i thought maybe pressure or loss of water could be the problem?
Thanks

 

[wiggikins]

What does the pressure gauge read.............should be between 1and1.5 bar

 

[dragondraig]

i can't see a pressure gauge on the system - the display only shows the temp when switched on with no buttons to select any other mode