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Sounds like the float valve,or ball cock, is either leaking or is partially submerged. If it is an older plastic ball on the end of a brass rod,lift the cistern cover and bend the brass rod down to make the ball valve close at a lower level of water. If this does not work flush the toilet and manually lift the ball valve to the closed position. If it leaks then you need to replace the valve seal.

If you have a more modern cistern with twin flush and plastic components,there is a level setting device located beneath the the water line to set the level. Click it up or down one notch at a time to find the right setting.

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15y ago

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