Hi all. Right, I have a baxi 105e that we don't really use a lot. But, we do bleed radiators every few months. Now, the problem is it keeps dropping pressure. What happens is we top it up via the two black knobs on the silver braided tube below the combi to about 1.5 bar then we'll knock it on for an hour or so via the 1hr button. The pressure whilst it is on if fine but when it has turned itself off the pressure has dropped. There is slight leakage via the outside pipe and no leaks inside. Thanks in advance for your help. 
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