On 16 Feb 2018 20:21:45 GMT, Tim+ wrote:

Murmansk wrote:
I've been asked to sort out a toilet cistern that keeps on filling and so overflowing.

Photo of offending item he

https://www.dropbox.com/s/vtfogxvkne...29.04.jpg?dl=0

Is it just a case of removing the circular blue bit and replacing a
washer or diaphragm or something inside there?

Thanks


More or less. If you turn the water off, unscrew the blue bit, you may well
find that it’s just a tiny bit of grit in the valve stopping it sealing.
Certainly well worth a look and cleaning out before you spend any money.

Tim
+1 exactly what happened to mine after Water Co did some work out in
the street. There usually a mesh filter in there, clean that as well.