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As requested here is a photo of the installation in the loft on the gable end wall.

Thanks for your help, I have learnt a lot today. I decided to remove the vessel and found the plastic disc underneath, and the air input under that. It refuses to take any air whatsoever, so I am resigned to a new one in the morning.

I can't locate the dust cap, although the vessel is against the wall. By take it off, are you suggesting it's within the water connection? (sorry to be thick - if it helps, it is a Flexcon vessel)

Thanks for that. No, I've not tried pumping it, as I don't know how I could do that. The only connection is the 15mm at the top to the system.

I have a central heating system which is a sealed system using a boiler located in the loft and a separate 8 lite pressure vessel (situated just below the boiler, resting across 2 joists) and a 3 bar safety release valve (situated just above the boiler). There are 14 radiators over 2 floors and...