Make sure your main water is turned on by turning on another sink or bath and if it is then turn your toilet valve off and on a couple times and see if any water comes out in your tank. If still no water is filling the tank then shut off the valve and take the supply tube off the valve and turn the valve on slowly to see if you have any water comming out. If still no water then your valve is plugged or your pipe to the valve is plugged which then you would need to clean out your valve or lines with the whole house water shut off. Sometimes I have seen that the plug is in between the valve an supply pipe connection and as soon i take the supply pipe off and turn on the valve it works just fine even when I put the supply pipe back to the toilet. I don't think it would be in your fill valve in your toilet tank unless you have pressure assist tanks and with them all you need to do is take out the screen inside them.
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.
There should be no reason the toilet would overflow. The water being turned off should have no effect on it. As long as the drain is clear even if the shut off valve in the tank didn't work, the water will just go down the drain.
Most likely due to hard water inside of the unit. Or possibley the h2o pressure going thru the valve.
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
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.
this is due to the ball cock in your main feed tank being worn or the ball valve in the toilet
Usually the water filling up the flush valve in the tank. If it's bugging you, you can change the flush valve to a new one.
The washer in the shut off valve has probably split or come off completely over time.
There are temperature balanced shower bodies that will adjust the hot water flow when it senses that the cold water flow drops due to flushing the toilet.
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.
Open the supply valve and also stop it from being air bound
If your marine toilet has a "Y" valve, and you are in a No DischargeY Zone, you must be certain that the Y valve is secured in a closed position