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Hello, there is no pressure at all in the vessel with the drain cock open.

I thought as much. What I was trying to work out was if the gauge would prevent the boiler turning itself on, or if it's just for information. I'd obviously like to know what the pressure is, but I'm worried that there are two problems with the boiler. Thanks.

Okay. Do I run the water out using the outlet valve with the filling loop closed and then check the pressure in the vessel? Should I leave the vessel at about 1 bar (can't find the recommended pressure anywhere in the manual)?

Is that the waste water outlet that runs to the outside? If so, yes, and it runs straight through when I open the valve manually and stops when I let go. As far as I can tell, it's completely closed apart from that.

With the gauge on a car foot pump into the valve on the expansion vessel (after checking that it was full of air by pressing the valve down). Thanks.

Sorry, that should read: Isn't full of water. It's full of air. Promise.

Oh, I should probably also have said that I checked the expansion vessel and it is at 2.5 bar (and is full of water).

Hello, I have a problem with our (2 and a half year old) WB Greenstar 30Si. It was, and has been, working perfectly until yesterday morning when the hot water started running cold. The boiler is now reading 0 bar pressure and will not fire up (at least I don't think that it will, it makes the...