Close coupled cistern leaking into pan, not the normal reasons!

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21 Feb 2026
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Hi all,
So CC toilet and a fair amount letting thro into the cistern, changed the syphon and it’s still going it. Whilst looking at the near empty cistern ( water level beneath the flange the siphon sits in ) and it’s still letting through. So cistern off, and replaced the whole arrangement with new washers and donut. It’s still letting through!
I can only assume that there is a crack in the cistern at the base of the flush valve?!
 
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