Open the toilet tank lid and inspect the parts. Water constantly going into the overflow tube is likely due to the fill valve. To stop water flow, adjust the float or replace the fill valve.
If water spills into the overflow tube, check the float ball or cup. To control the water level in the tank, adjust the float arm or replace the damaged float mechanism.
A worn-out or misaligned flapper can cause a running toilet. The flapper is a seal at the tank’s bottom. It opens and closes for water flow. If not sealed properly, water will continue to leak into the bowl. Inspect the flapper for damage or misalignment, and replace it if necessary.
The flush valve could be the issue. This part releases water from the tank into the bowl. A broken or rusted toilet flush control can cause continuous water flow. Replace the flush valve to fix the problem.
Regularly check the bottom of the toilet for water leaks. Water on the floor may indicate a broken wax ring or an insecurely attached toilet. Fix toilet problems to prevent water damage.