Flap Valve Not Closing Fully

[nashville]

The flap valve on my close-coupled wc seems to have started to stay slightly open. This causes a constant flow into the pan.

I can't see any grit or scale stopping it from closing. What might be causing this, and how do I mend it? If replacement is the only answer, do I need to remove the cistern?

Thanks

 

[nashville]

BUMP

Worried that the continual flow into pan and out into stack will freeze the stack.

 

[Axel]

If it's a 'fluidmaster', then this: http://www.screwfix.com/search.do;j...tton.x=0&searchbutton.y=0&searchbutton=submit

should be easy to fit.

 

[Bahco]

What flap valve?

 

[compheat]

Do you mean the flush valve ?? is it a push button WC??

 

[nashville]

Bahco - The flapper valve in the bottom of the cistern.

Compheat - Yes, and yes

 

[compheat]

A flap valve is a non return valve

You need to take it out of cistern and check why its jamming, I've got one one a job at the moment were it keeps sticking for no reason just going to have to replace it.