Hi, So i have a problem i was hoping some one here may be able to help with..My boiler as low pressure well in fact the dial is at zero...is raising the pressure something i should be able to do or should i call somebody out to look at it? The boiler as 3 Valves i can turn and the a silver metal pipe but does not have any valves attached to it..If needed i can upload photos to give a better idea of what i mean....Thank you.