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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

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...