yes, the water pressure is low on boiler. If you look on the bottom of boiler at rfront right hand side there's an opening the pressure gauge is there, the needle will be on 0 or there abouts.
There should be two valves near the boiler may be capped or with a silver hose connecting the two. If there's no hose fitted you'll need to get one (check on top of boiler), if the hose is there open the valve until the pressure reaches 1.5 bar and the boiler will work. Remember to turn combi fill valve off again
Heating Engineer, November 2007