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This question already has an answer here:

I changed the fill valve with water sensor valve and the water is still running. The water does not exceed normal volume.

Why is this?

marked as duplicate by isherwood, mmathis, Chris Cudmore, ThreePhaseEel, Daniel Griscom Oct 5 '17 at 15:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Replace the flapper. – Tyson Sep 17 '17 at 22:02
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What @Tyson said, replace the flapper valve (the one that drains the water from the tank to the toilet bowl). Or check that the flapper is seating properly. It could have gotten stuck, warped, something is stuck under it or is just too old.

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