Discuss Dudley cistern overflowing? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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I have a Dudley concealed cistern with electroflo flush, and internal overflow. There seems to be a very slight leak into the bowl, not much - if I wipe the surface clean, a drop forms and runs down into the bowl after a few seconds. It's not much but it's building up a stain on the porcelain, so I'm assuming I have an overflow leak. But - the water level is not overly high in the cistern, and I can't see any drops coming from the filler valve. I guessed that the overflow is the white 'tube' cast into the body of the cistern - if so, the water level's nowhere near the top of that.
Is there a problem here, or is this normal?
Then there's the intermittent failure to 'long flush' by the electroflo...

Thanks,
Roger
 
most likely the seal on the flush valve is letting by slightly
 
Can you remove the flush valve to clean off any limescale and grit?
 
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