If a toilet appears to be running continuously without water leaking out onto the bathroom floor, the issue is an internal water bypass within the tank mechanism rather than an external seal failure. This internal running is caused by water spilling over the top of the overflow tube because the water level is set too high, a malfunctioning fill valve that fails to shut off completely, or a worn flapper valve allowing water to seep constantly into the bowl. Verification: Remove the tank lid and check if the water level sits more than an inch below the top of the overflow tube.
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