Dear All, The pressure in my Ariston boiler is quite low at the moment, about 0.6 bar. I'm aware that I should be able to refill it using the filling loop, which I think I have located directly under the base of the machine. What I can't find, however, is the valve to let the water in, as the filling loop doesn't appear to have any valves on it. There is a blue "plug" at the top of the cold water pipe which rotates, but doesn't seem to let water in. Does anybody here know whether I should be looking somewhere else? Many thanks!