Bob,

I checked this, it has the overflow down inside the syphon, but no the
water level isn't reaching the top of the overflow pipe.

cheers
Mitch

burbeck wrote:
hi mitch
has the cistern got a overflow pipe? if it is the type with overflow
into the pan rather than an external overflow, then it may be that it
is ovefilling the cistern, ie water level too high. could be just
needing adjustment or washer on the ball valve
regards
bob