Check the water in the small head tank in the loft. It should be one third to one half full. If not rattle the ball valve up and down as it is probably stuck
no would need plumbing to be re-arranged a bit - but without seeing your pipework it's hard to say if it is the cause or not
where your tank is in the loft, there are 2 pipes going/coming from it - follow these down into your system (near the cylinder usually) and then tell me where the pump is in relation to them
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