Sounds like the diaphragm has got a split in it, and will need to be replaced.
you can buy them from any plumming center, and are not expensive to buy.
Although it can be a fiddly job getting on the floor and undoing the nuts , they always seem to be in hard to reach places, so give yourself a good hour or so for the job.
Michael Smith
July 2009
diaphragms gone in the syphon.
hi-spec plumbing & heating (essex)
July 2009
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