To change my bathroom sink faucet I first tried to close the valves below. The cold water one shut just fine, but the hot water valve just won't move. I used a wrench to get leverage on it, but that didn't let it budge either. I know I have to turn it clockwise to the right, just as I did with the other one. I'm female and not sure if I should really put more pressure, if I can, to close it. But I'm afraid it will break, then I'll have to use the main shut off and call a plumber. Any ideas to loosen the tight grip of the valve?

perhaps you have a water supply issue on hot side. Have you tried shutting of hot water angle stop valve under sink and removing supply line and opening angle stop valve to see if you have hot water?

Maybe hot valve is cut off under kitchen sink or valve is defective

This could be a lot of possible fixes. Try putting a piece of tube insulation around the pipe at where it is hitting on a another pipe or something. This would at least stop the noise. That is the nature of the beast with the noise. Hot water responds that way depending on what is going on in the air .

Hi,
There is a loose washer in the faucet...this flaps as the water goes through it and makes the vibration...
You either need to replace the faucet or the cartridge (washer) in the faucet that valves the water...
This will stop that vibration and hammering sound

heatman101

What is likely happening is a small piece of sediment has become lodged in either the mixing valve or in the aerator.

Begin with the easiest part first. The aerator is the threaded attachment from which the water comes out of the faucet. Remove the aerator from the faucet and run the tap without it installed. If the flow rate is good either clean or replace the aerator.

If this was not the problem then the solution becomes much trickier because the obstruction is likely in one of the lines coming into the faucet or in the body of the faucet called the mixing valve. This is where the hot and cold water mix inside the faucet.

Our next step is to create negative pressure inside the faucet in an attempt to remove the buildup restricting the flow.

If you don't have shut off valves under the sink you will need to shut off the water supply to the home, remove the faucet from the vanity/sink and perform the following procedure.

Shut the hot and cold water off underneath the sink and remove the supply lines at the shut off valves but leave them connected to the faucet. You will need to purchase two adapters for the aerator that will allow you to connect a garden hose from your closest water supply (kitchen sink) to the vanity faucet. You can find these at your local hardware store. You will also need a pail under the vanity to catch the water coming out of the vanity faucet supply lines. Connect the garden hose from an active water supply to the vanity faucet. With someones help have them turn the water supply on which will then run backwards through the vanity faucet and into the pail underneath the vanity. Be sure to open the vanity faucet taps to full so that water will run through the faucet. This should dislodge the obstruction.

It is very common when you first install any faucet, for the aerator on the very end of the faucet (where the water comes out into the sink) to plug up with rust or sediment. Because you had to turn off water supply, it churns up this sediment in pipes. It initially plugs up the filter/screen in aerator. Just unscrew the end & flush it out with water. Then reattach.

chances are that you have a bad faucet that is drawing water from a cold water tap. You will need to have a helper turn on the hot water in that bathroom while you feel the pipes at the water heater and see if they are heating up. If they feel like there is no flow, the water is coming from somewhere and you will need to turn the shut-offs of at various sinks to target the problem faucet. If you find which cold water line is acting up, install a back-flow check valve so the water goes only one way, toward the faucet.

To clean it, shut off the discharge valve at the water
heater. Then, you shut the valve off of the main water supply. After which, you can start cleaning the single
knob shower cartridge. After the cleaning job, you can
open the discharge valve of the water heater, then, the
valve of the main water supply.

Yes, you need to replace it.

make sure your water valve is working properly undo line and open valve if its working than take apart faucet and check for debri