How to turn on a waterfall function?

problem in the tap washer (expanded and blocking the water flow
blockage inn the connection where the shower head connects at the wall
hot water flow restrictor so that you will not get burnt by the hot water --test by turning on the cold water first and then opening the hot tap as well

My first suggestion is to have the installation plumber return to adjust the faucet to function properly

1. Check that you are not turning the diverter too far or not far enough in the SHOWER direction.

2. It's possible that the the center part of the diverter that shuttles between ling up with the TUB hole or the SHOWER hole is installed backwards. In the SHOWER position the water pressure keeps it in the SHOWER position and when water pressure drops it defaults to the TUB position. When installed wrong, the water pressure pushes it to the TUB position.

Hopes this helps. Let me know via message or rating (if helpful)

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.

Check water lines to shower and make sure that there is no blockage or water cut off to it. Valve itself could be bad also or blockage inside it.

I f it is a tub & shower unit the diverter may be bad or stuck in place restricting water flow. Some are push button on the valve or a pull unit on tub spout to send water to shower head.
Cut water off and remove to inspect for reason not functioning correctly.
Remove shower head to inspect for blockage. The srceen may be stopped up for the shower head. Remove turn water on and see if any flow comes out shower arm.

Usually whenever you do any repairs on plumbing, you dislodge calcium from the inner surfaces of teh plumbing. Check to see if ther is a mesh filter in the inlet side of the head. and remove and clean it. otherwise you could remove it and use a vacuum yo try and remove any deposit that may be in it. If that is unsuccessful,
you can always return it, but always remember to open the fawcett and run it before installing the head.
This is an essential part of any plumbing job. Good luck

. If your local store refuse to replace it Moen will gladly do so with no problem.

They are good like that.

you have to take the handle off
there should be an insert that you can adjust by pulling out and turning

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

I would unscrew shower head pipe and either pipe dope it or tefilon the threads and then reinstall it. I would also take the handle(s) rosettes off and look for a leak from there with a flashlight, while shower is on. I believe the most comon leak for walk in showers are the door seals. Are you sure it is not coming out from under the door? Another test that yuo may want to preform is to Stopper the drain, fill the shower pan with water and watch for bubbles, or look for leaks from below.

try replacing spout, sounds like the old one is a lil bit worn