Silent Running Toilet eluding capture | DIY Plumbing Advice | Plumbers Forums

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I have three toilets in the house. Two have been "silent running" for a while now (constant trickle of water leaking from the cistern into the bowl).

They are identical Ideal Standard units as shown in the picture.

I successfully fixed one of the toilets by replacing the seal at the bottom of the flush unit.

But the second continues to run, despite:

  • Replacing the seal at the base of the flush unit
  • Swapping out the flush unit with the third (always ok) toilet
  • Swapping out the flush unit holder that screws into the base of the cistern
  • Tightening the screws that hold the cistern onto the bowl as much as possible.

The offending toilet I dismantled and reassembled a year ago as part of a wetroom installation. Perhaps it's something to do with the screws that hold the cistern to the bowl? When I did this work I felt confident that it was done correctly.

I'm out of ideas. Anyone got any suggestions?
 

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Is the base plastic smooth eg where the silicon / rubber seal mates ?
 
Is the base plastic smooth eg where the silicon / rubber seal mates ?
If you mean the screw fitting that holds the base of the flush unit, then, as mentioned I swapped this, as well as the flush unit with another toilet that wasn't leaking, and the leak stayed with this toilet. In any case, I did check that the surface that mates with the seal at the base of the flush unit was completely clean, flat and free of any debris/scale.
 

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