Toilet keeps running

What you're probably seeing

The toilet refills on its own or never stops running.

Likely causes

• A worn flapper that doesn't seal.
• The fill valve set too high or failing.
• A float or chain problem.

Safe checks you can do now

1. Lift the tank lid and check the chain isn't caught under the flapper.
2. Lower the float so water stops below the overflow tube.
3. Turn the valve behind the toilet to stop it meanwhile.

When to call a pro

Parts are replaced and it still runs, or you'd rather not do it.

General information about common causes, not a diagnosis of your home.