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Roca Dual Flush toilet?

My toilet lets out a howling noise when the dual fluish Roca cistern is refilling.Is this a common fault as I cannot see any other comments on this.It has only done this after about four years use and does not do this on every flush.Any other fellow sufferers out there ?
Stan the man, May 2010
sounds like the QE 2 coming into port
it's the diaphragm in the fill valve.
change diaphragm or the complete fill valve.

common fault.

hi-spec plumbing & heating (essex), May 2010