When turning of the shower this morning water never completely stopped coming out of shower head. House is still under warrenty but, since its Saturday, no one can be contacted to come fix it. I took off the handle that turns water on and off to see if I could adjust something and managed to decrease leaking to a slow drip, but I am not familiar with the mechanisms inside and don't want to make things worse. I just want to stop the drip until they can fix it through warrenty. Kevin

You have to turn main water off to house, then in side shower head is a gasket / otherwise known as a 0-ring, that needs replacing. Yes, a 50 cent part is causing this. If you don't know how to replace shower head 0-ring, just take shower head to any home depot,they will put it inn for you. Just make sure you turn main water line to house off, otherwise real leak. Let me know if helps. Thanks mike

Turn the water off to the house and try taking out the center handle. There will be a rubber or brass washer you need to replace.

Take the shower head off (and the valve) then turn the shower on and see if water will come out of the shower neck without the head on head on it

To clarify your question, are saying that you just had a new water heater installed in your house and the shower head in the bathroom can't get water through it? If that's what you meant, the water restrictor in the shower head is plugged with sediment. This often happens during water main shut offs and then turned back on. It shocks the sediment on the inside pipe walls. The first places it affects are shower heads and faucet aerators. Remove the shower head and clear the clog or replace with a new shower head. If this is not what you meant to say, then rewrite your problem.

Normally the diverter in the spout does just that. It's basically just a little door you pull up to stop water from flowing out the outlet to bathtub, and it diverts water to shower head as it has no where else to go, as the door has been shut. Think of a "T", if you have water coming in, it's going to go out both openings if nothing stopping them, and they are at same level, but when you plug lower one, the water flows up and out the other. My guess is your getting very little pressure from head when it's still coming out at tub.
NOTE: before attempting this, make sure you incoming water supply to house is shut off at valve. Anyway, those spouts are usually held on by a set screw up under bottom side of faucet near back of it, (close to tub) there should be a small slot which will probably be an allen head or philips. You back that screw out, then twist and pull and it should slide off of copper pipe. If no indication under there of a set screw then there are also those that just thread on, which requires you just turn faucet counterclockwise to remove. Replace entire piece all in one, and be done with it. Most hardware or home centers will sell just that separate. Make sure you get the one with diverter. (handle that you pull.) Clean pipe well with steel wool if it's dirty and corroded before sliding new one on, and wipe some "vaseline" on pipe to help and protect "O" ring inside spout. Slide new on on all the way and tighten set screw on underside. If threaded, clean threads, add pipe dope or teflon tape and thread it on until aligned and tight. Good Luck.

Screw off shower head-obstruction in water saver disc or screen,piece of rubber or rust

You will have water coming out of the shower head when you have really good water pressure. There might be more water volume coming out through the valve then what the tub spout can handle and in turn sends the water up to your shower head. When you fill your tub try turning the water only half way on not at full pressure, does this keep the water from coming out of the shower head? Most likely your valve has a 3/4" supply line while your shower head and tub have only a 1/2" supply line. Sounds like you have more volume to the valve than what the tub spout can handle. You might consider one of two things: 1) you can put a water regulator on the main supply line going into the house to lower your pressure, or 2) change out the supply line to the tub spout, increasing it from 1/2" to 3/4". Let me know whats going on.

Yes shut of main water, then remove handle, then take off bonnet, that holds stem in valve. You will have to take stem with you to hardware store to match up. Put it back together in reverse, turn main water back on. Now you tell everyone your a plumber and get much respect.

If you are taking about then neck of the shower head this is what you must do. its no need to turn the water off to the house or to the bathroom first you will need a pair of channel locks and some Teflon tape. first remove the shower head if you dont want to scar the nut on the shower head place cloth between the pliers and the fitting, once removed (very important) turn the channel locks upside down stick one side of the blue handle up in the neck of the shower and rotate to your left to loosen if you are having a leak leak there it should already be semi loose, once removed wrap the threads with the Teflon tape and re-insert making sure it is tight, then wrap the the outer end of the neck with Teflon tape and place the head back on.The reason it leaked is because the plumber who installed it did not tighten it up completly because he wanted it to look straight coming out of the wall and the additional water pressure causes it to leak wheras the hot water causes it to expand and seal

Does the tub spout water flow stop when the shower knob is pulled?

Was the systems pipping flushed before the shower head was installed?

It may be clogged, remove the shower head and then attempt to operate. If it is clogged you will see debris trapped in the screen at its connection point. The shower head can be disassembled - cleaned - reassembled

Is the shower head an adjustable type, that may be in the off position?

Good luck
Aduz