toilet cistern keeps filling

[bbill1234]

i have two identical toilets.
One works fine, the second was ok for a year or so, now the cistern keeps filling, sometimes you can see a tiny trickle of water in the bowl.
I have taken the fill valve/float out, cleaned the rubber seal.
I have swapped them over and the first cistern works with either fill valve/float.
the second cistern keeps filling with either fill valve/float.
this makes me think it's something else - what could it be?

 

[adlplumbing]

get a new one

 

[Charnwood]

Your flush valve is letting by.

 

[seco services]

Your flush valve is letting by.

Second that.

 

[bbill1234]

Your flush valve is letting by.

Second that.

thanks but don't know which part that is - part of the syphon? do i replace the syphon?

 

[adlplumbing]

take a pick of inside the cistern

 

[seco services]

As said give us a pic.
useal fault is the rubber washer seal on the base of the flush valve.

 

[ChrisOxford]

Or could the float valve be faulty and water entering the bowl via the internal overflow?

 

[adlplumbing]

i was wondering that
or it has moved to side and the float got stuck

 

[buck51]

Is the flush valve cable operated???? if so, then you may find that the cable is binding, so the valve aint closing.

 

[adlplumbing]

hence the pic will tell a thousand words

 

[bbill1234]

hence the pic will tell a thousand words

float def not stuck, its like a little upside down plastic cup, (its a torbeck adjustable height bottom entry fitting valve) as ive said it works in the other toilet but not in the one it normally lives in.

I will get a photo of inside cistern tomorrow.

i have checked and cleaned the seal with the little pin in it behind the float arm, it was clean and in one piece - didnt look faulty.

ive looked at the fitting instructions and there is no mention of checking/cleaning anything else at the base, and its not cable operated.

internal overflow sounds possible but why?

thanks for all your posts

 

[ChrisOxford]

internal overflow sounds possible but why?

If the water level in the cistern's too high (for whatever reason), excess water will drain through the syphon's internal overflow, down into the pan.

 

[seco services]

ive looked at the fitting instructions and there is no mention of checking/cleaning anything else at the base, and its not cable operated.

internal overflow sounds possible but why?

You are talking about the flush valve not fill valve aren't you ?

 

[Charnwood]

as you will guess - i'm not a plumber - if my flush valve is letting by, which bit do i replace? is it part of the syphon?

As you are not a plumber, here are the options regarding flush/outlet valve:

Syphon:

Flush valve, various styles:

..

..

Flapper valve:

Is your toilet low level or close coupled?
Low level:

Close coupled:

Where does the water supply come from to each toilet, both mains, both tank, one from each?