Hi. I have a V&B toilet with dual flush system. Over the last few days there is a continuous noise after flushing. It's like the cistern is finishing filling up but instead of stopping the noise carries on (it's not loud but it's noticeable). There is no sign of water leaking anywhere or that the bowl is filling when the noise occurs. What is it??!! Should I be worried?? Can I fix it easily? Last time I got a plumber out to one of these toilets he couldn't even work out how to lift the cistern lid, so I don't really fancy trying that route again! My understanding is that the cistern lid can be removed if the ring around the flush buttons is turned but I tried to turn this both ways and it didn't move much and I didn't want to force it. I then don't know what I'll find inside or what to do with it?! All help gratefully received:-)
Thanks.

newone, November 2008

Popeye and Keith provide excellent answers but putting the cistern lid back was not so easy. It could be necessary to raise the part of the cistern workings into which the plastic screw is screwed. You do this by pressing a couple of knobs on the side of the central piece and gently pulling the central pat of the workings upards.

Gibson, June 2010

The solution is easy. Remove the two buttons at the top (by pushing one down and pulling on the other). This reveals a central screw that is removed allowing the whole lid to be removed.

popeye, September 2009

Push one knob down ( probably the smaller one ) and lift up the other one [on inside edges, you will actually see arrows] and underneath them is a lage white plastic screw head. Unscrew carefully, so as not to strip slot out of head, and up will come the knobs and surround. You can then lift off cistern cover.

I purchased a replacement from bathroomstudio.co.uk, who also told me how to get lid off.

Keith D, November 2008