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Yes, I have turn both valves off so there should be no water coming through, highly unlikely both valves are faulty

Yes the filling loop is is turned off

I have checked the expansion vessel’s pressure and it read 0.75 Bar of which it falls into the correct pressure value of 0.75 to 0.90 Bar, but the pressure does keep going up to 3 Bar and dumping water out of the pressure release drain off pipe outside when the boiler is operation. Is there a...

I have just set the pressure to 1 bar and turned on the heating on and watched the pressure go right up to the max 3 bar and the water started dumping outside. But why is the pressure going up?

My boiler has started losing pressure, so I tied a plastic bag to the outside pressure relief valve pipe and it's dumping water into it. Why is this happening ?