The fill valve has a leak in it or if it has been replaced the setting is 2 high.if the valve is old - it needs 2 b replaced.sometimes the shaft or wire that i used 2 set the level, corrodes off.
Turn off the valve & tie up the ballcock...
Infiltration
You should not ever hear your tank filling unless you are using hot water somewhere. Your tank is under pressure always so it would never be filling if you were not using hot water.
Your toilet tank may not be filling up properly because there could be a problem with the fill valve or the float mechanism. These parts regulate the water flow into the tank and may need to be adjusted or replaced if they are not functioning correctly.
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.
There could be several reasons why your toilet tank is not filling up properly. Some common causes include a faulty fill valve, a clogged water supply line, or a problem with the float mechanism. It is recommended to check these components and make any necessary repairs or replacements to ensure proper filling of the tank.
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.
A continuously running toilet may be caused by a faulty flapper valve, a problem with the fill valve, or a leak in the tank. These issues prevent the tank from filling up properly and can lead to wasted water. It is important to address the problem promptly to prevent water waste and potential damage to the toilet.
Stop filling him/her up with air.
To determine if your hot water heater is full, you can check the water level gauge on the side of the tank. If the gauge indicates that the tank is full, then your hot water heater is full. You can also listen for a gurgling sound when the tank is filling up, which indicates that it is reaching capacity.
Open the supply valve and also stop it from being air bound
Your toilet may not be filling up properly due to a clog in the water supply line, a malfunctioning fill valve, a problem with the float mechanism, or a leak in the tank. It is recommended to check these components and make necessary repairs or replacements to ensure proper filling.