DerbyBorn Wrote in message:
The cistern must be at overflowing level. A bit of a fluctuation in th
epressure is allowing the ball valve to pass a bit of water that is then
causing an overflow into the bowl - assuming it is an inegral overflow.

Try reducing the water level to about !cm below the overflow.


Worth a look but I can't think why that doesn't happen when sink
or bath taps operated?

--
Jim K


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