What Might Cause a Toilet to Fill Its Tank Repeatedly Without Being Flushed?


Quick Answer

A warped or worn flapper may cause a toilet to flush by itself. The flapper is the component of a toilet that controls the flow of water from the tank to the bowl. If it doesn't seal correctly, the tank-filling float triggers the flow of water.

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Full Answer

To diagnose a damaged flapper, remove the lid of the tank and pour a few drops of food coloring into the tank. After 30 minutes, a loose flapper seal bleeds the food coloring into the toilet bowl water. Replace the flapper by first turning off the water to the toilet, draining the tank. Detach the old flapper from the chain that connects to the handle, remove it and install the new flapper. Re-attach the chain to the appropriate length and ensure a proper tank seal.

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