Why does my toilet randomly run water?
Why does my toilet randomly run water? Your toilet randomly runs on and off for a few seconds due to a problem called “phantom flush”. This is caused by a slow water leak from the tank into the bowl and is often the result of a sediment build-up on the flapper (aka “flush valve seal”) or a bad flapper seat. Why does my toilet stop running when the tank is full? If you leave the handle, the flapper will block this hole while the tank becomes filled with water. You will also notice a plastic float on top of the...