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Because something's wrong with it. Exactly what is hard to tell, and the wording of the question doesn't help at all.

If it's filling up but not shutting off (it continues to run even after the tank is full, with water going into the overflow drain), the problem is most likely that the shutoff valve needs to be adjusted.

If the water continues to run but the tank isn't filling up (and there's no obvious puddle of water around it indicating a leak), the flapper valve probably isn't seating properly (this is the classic "jiggle the handle" problem).

If the water isn't running at all, it's probably shut off at the wall valve (or somewhere further up the line).

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Q: Why doesn't the toilet tank not filling up with water and shutting off?
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How a toilet 'knows' when to stop filling the tank?

Toilets use float valves. These are air filled balls that float on the water, as the cistern fills with water the ball floats higher. The ball is attached to an arm connected to a valve, when the ball reaches a predefined level the valve closes, shutting off the water to the cistern.


What causes household plumbing to 'groan' when the toilet is flushed?

If this noise occurs after shutting off a fixture (e.g., shower or sink), I'd pop the lid on the toilet tank and check there. Sometimes, this type of noise occurs when water pressure is reduced somewhere else, causing the fill valve to open slightly and howl like a foghorn. So, after shutting off the water and hearing the noise, pull up on the toilet tank float to see if it stops. If it does, replacing the fill valve will fix it.if still problem persist call for plumbing repair service.


What causes toilet tank to stop filling up with water?

The fill valve (ball valve UK) is siezed or clogged. As the water level rises, the float-ball rises and closes the valve when the water reaches the proper level.


How do you replace a flapper in a toilet?

Shut the water supply off to the toilet. Flush the toilet. Pull the old flapper out and replace it with the same type. Turn the water back on and test the toilet.


What causes a toilet to overflow when the washing machine water empties?

Sounds like the washing machine discharge is fitted to the main drain in the wrong place and it's discharge is filling your toilet. It's possible there may be something of a blockage just after the toilet, causing a backup. I would try to snake the the pipe from toilet out. You may even have to remove the toilet from the floor and do it there if there is no access underneath (like a basement or a crawlspace). I have snaked main drains from the toilets many times, and it's a pain having to re-re the toilet, but often it's the only way.

Related questions

How do you turn off the water to the toilet?

shutting off the valve


How does toilet water help you pass a drug test?

It doesnt, trust me.


Where would a ball cock be used?

In a toilet tank or water reservior to regulate filling.


How a toilet 'knows' when to stop filling the tank?

Toilets use float valves. These are air filled balls that float on the water, as the cistern fills with water the ball floats higher. The ball is attached to an arm connected to a valve, when the ball reaches a predefined level the valve closes, shutting off the water to the cistern.


The toilet tank is not filling with water. In fact I don't hear running water. What should I look for?

you should try to look in the back of the toilet and search for any clogs in there while you flush it. if that isn't the problem then i don't know what it is


Why does the toilet not flush?

Assuming you have a regular tank toilet with a ball float and rubber flap and that the water is turned on and the tank is filling, the most common cause of a toilet not flushing is a broken or detached chain that runs from the handle lever to te rubber flap that keeps the water in the tank.


How does one stop a toilet tank bolt leak?

You should get a plunger stick it in the toilet and hold it in there till the water slows down and if that doesnt work close the toilet seat and wait til you hear a dweeling sound that means the water is going down.


How can I install a new toilet?

You need to hire a plumber to properly install a new toilet. There are many issues that may arise if you try to install it yourself. Make sure you know the requirements such as shutting off the water before doing it.


Why do you fill your bath tub in storm?

Filling the bathtub with water during a storm is recommended as a precaution in case of a loss of power or water supply. The stored water can be used for drinking, sanitation, or for flushing the toilet if necessary during a storm-related emergency.


How do you stop the toilet tank from filling with water?

There should be shut off valve called an angle stop towards the floor on the left side of your toilet. If you shut this valve by turning it clockwise this will stop the feed of water to the tank of your toilet.A:Your float valve may be defective or worn out


What does the hose that goes from the toilet valve to the overflow do?

That device is called the refill tube. This allows water to go down the overflow tube to refill the water closet bowl while the tank is filling.


Why is my Toilet tank not filling?

First check to see if the valve for the water supply is turned on. If that isn't the problem you may need to replace the tank water valve, they do wear out and are not that expensive or difficult to replace.