Why Does My Toilet Run Intermittently

A toilet that cuts on and off by itself, or runs intermittently, has a problem that plumbers call a “phantom flush.” The cause is a very slow leak from the tank into the bowl. … The solution is to drain the tank and bowl, check and clean the flapper seat and then replace the flapper if it’s worn or damaged.

Why does my toilet randomly run for a few seconds?

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 keep filling up every few minutes?

If your toilet keeps refilling at 15-minute intervals, it probably has a leak. In the vast majority of cases, the problem is with the flapper, which is the rubber seal between the tank and the bowl. … There’s a more serious possibility, however, and that is that the tank is leaking. If so, you’ll see water on the floor.