On Wed, 28 May 2008 21:06:14 +0100, A.Lee wrote:

PCPaul wrote:

Now that one's sorted, mine is even more weird - same setup *but* with
a traditional lever and syphon. Every so often it trickles water into
the bowl for ages (1/2 hr+) and the only way to stop it is to flush
again or to take the top off the syphon (which is held on with a
plastic pin).

It's not an overflow as the cistern doesn't ever fill up, it just flows
straight out again. The syphon doesn't look full so I don't think water
is going up and over.
Any thoughts?

Sounds like a bit of muck, or even a few hairs in the cistern, causing
the seals to be slightly open, allowing a trickle out. I've had them as
well where the siphon is slighlty misaligned, and the slight twist in it
stops the spring pushing the flap down to the seal. Probably easiest to
just fit a new siphon. Also, do you put those blue tablets in your
cistern? They are known siphon killers, as a blue gunge builds up around
the bottom of the cistern.
Alan.

But that's the thing - it's a syphon, not a flap valve. There shouldn't
*be* any water to trickle out.