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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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11y ago

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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


Is it bad to shut off the water to the toilet?

Shutting off the water to the toilet is not necessarily bad, but it can prevent the toilet from flushing properly. It is important to only shut off the water when necessary for repairs or maintenance.


Why is the water level too high in the toilet tank?

The water level in the toilet tank is too high because the float valve is not shutting off the water flow properly.


What is the proper procedure for shutting off the water supply valve to a toilet?

To shut off the water supply valve to a toilet, locate the valve usually behind or near the toilet. Turn the valve clockwise until it is fully closed. This will stop the flow of water to the toilet.


Why does my toilet make noise when filling up with water?

Your toilet makes noise when filling up with water because the water flow may be too strong, causing vibrations in the pipes or the fill valve. This can result in a humming or whistling sound as the water fills the tank.


Why is my toilet tank not filling with water?

Your toilet tank may not be filling with water due to a faulty fill valve, a clogged water supply line, or a problem with the float mechanism. Check these components to determine the cause of the issue and make necessary repairs or replacements.


Why is my toilet making a filling noise when not in use?

Your toilet may be making a filling noise when not in use due to a faulty fill valve or a leak in the toilet tank. This can lead to water wastage and higher water bills. It is recommended to have a plumber inspect and repair the issue to prevent further damage.


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.


What is the purpose of a toilet overflow valve and how does it prevent water damage in case of a toilet overflow?

The purpose of a toilet overflow valve is to prevent water damage by stopping the flow of water when the toilet bowl is full. It works by automatically shutting off the water supply to the toilet when the water level reaches a certain point, preventing any excess water from overflowing and causing damage.


What should I do if I notice water leaking from the base of my toilet?

If you notice water leaking from the base of your toilet, you should immediately turn off the water supply to the toilet by shutting off the valve located behind the toilet. Then, you should contact a plumber to inspect and repair the issue to prevent further damage.


Why is my toilet bowl not filling with enough water?

There could be several reasons why your toilet bowl is not filling with enough water. Some common reasons include a problem with the fill valve, a clog in the water supply line, or a malfunctioning flapper valve. It is recommended to check these components and make any necessary repairs or replacements to ensure proper water flow in the toilet bowl.