Mystery of the leaking toilet

[Pickwickpick]

This can happen as a result of a combination of two independent faults. Firstly the float valve is set too high or is faulty and is letting by. When not being flushed, the level in the cistern creeps up. Secondly, the overflow has not been installed correctly and leaks when the cistern level gets up to the outlet...

I always test overflows for leaks and proper operation very carefully. Once bitten, twice shy...

My apologies if someone else has already suggested this. There's a lot of noise on this thread so I might have missed it.

Yep I'd agree usually but seeing as they're on their 3rd toilet it seems very unlikely that their plumber has cocked up the overflow installation 3 times (although they do say assumption is the mother of all...)

 

[Chuck]

Yep I'd agree usually but seeing as they're on their 3rd toilet it seems very unlikely that their plumber has cocked up the overflow installation 3 times (although they do say assumption is the mother of all...)

It was more of a war-story than a diagnosis. 🙂

 

[Pickwickpick]

It was more of a war-story than a diagnosis. 🙂

A very useful one tbf, overflows often get overlooked, had to sort one out a couple of weeks back where the landlord had his handyman "plumb" it all in 😕

 

[Staffy85]

on there 3rd toilet?!! i totally missed that bit... as mentioned, idd be removing the toilet and drying it out with a fan and see if it continues to get wet without it for a few days

 

[Ben Walters]

This can happen as a result of a combination of two independent faults. Firstly the float valve is set too high or is faulty and is letting by. When not being flushed, the level in the cistern creeps up. Secondly, the overflow has not been installed correctly and leaks when the cistern level gets up to the outlet...

I always test overflows for leaks and proper operation very carefully. Once bitten, twice shy...

My apologies if someone else has already suggested this. There's a lot of noise on this thread so I might have missed it.

Don’t most syphones have intergrated overflows nowadays? Surely the water takes same route as when you flush it if the cistern is over flowing?
Or are you talking about when the overflow has been drilled to outside?

 

[Chuck]

Or are you talking about when the overflow has been drilled to outside?

This. It's not clear to me which type the op has.