header tank filling

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6 Jan 2018
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United Kingdom
Hi, the ball cock on my cold water header tank on my s plan heating system is continually adding water to the tank yet there are no taps on and no signs of a leak. The hot water is fully pumped by the way. I don’t know if this is related but the header tank for the heating system has warm water in it. Has anyone any ideas where I should be looking. It is a large extended house. Could it be anything other than a leak on the hot water system. Thanks , PS nether of the overflows are running.
 
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The valve which doesn't close: is this on the large, cold water storage tank?
If so, that water must be going somewhere.

Have a close look at your toilets - is there any water trickling down the pans?
 
If you pull the ball cock up by hand ,does it now stop water fully ? If it still let's water in ,re new the valve .
 
Thanks echoes, I totally forgot that some of the loos may be low pressure . I will check them Sunday morning when I’m at the property . Thanks terry plumb, the ball cock is operating fine it’s the tank that keeps emptying for some reason.
 
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