We have a Moen tub/shower faucet and when turned to the hot water position no water comes out at all. We feel like this is an issue with the valve but aren't sure how to replace it.

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

you need to adjust the little gear like..plastic part under handle..plus hot water must be on so that the pressure is balance..the cartridge also needs to be adjusted so water is off on off position

these valves can be adjusted by removing the handle and adjusting the white gear that regulates the hot and cold that come out, try going more to one way if it gets colder then go the other way.

You can cap the lines at the tub faucet to rule out tub faucet. It maybe mixing there.

Faucet may be bad also the safety stop will alow you to change water temp it can be tricky to adjust water temp.

Hello
Take the plastic knob off.Turn the brass stem with a pair of pliers until you get it in the proper position.

Off faces down
Cold faces left
Hot faces right

Once in the position screw pastic knob back on.

spool valve is clogged remove clean replace

sounds to me like someone turned off your hot water at the valve.

Did the hot water shut off get turned back on fully after the change? Is the hot water line kinked under the sink? Is the hot water shut off valve working?

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Yes it is fixable and easy.To save you time because I belive you will be needing a new part from Moen I am sending you this easy link to quickly resolve your issue. Just be sure to tell Moen you are original owner of faucet and all parts are lifetime free including shipping. Go Moen!!!

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http://www.moen.com/contact.cfm?location=TopNavCustomerSupport

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Hi varn4620,

I'm Harvey the Master Plumber.

Your question is: You had to replace the faucet in the tub due to a broken plastic piece in valve stem. Bought a Moen ripped the wall out and put new faucet in. Went good untill we turned the water on and the shower rained on us. Tightened everything you could find to tighten .Every time the water is turned on the shower rains. Can this be fixed or is the faucet broken?

Is this new faudet a single handle? If so I"ve had this experience also. Most of the time it's because the guts were not lined up properly at the factory. You may have to play with it a bit.
Turn off the water and take the handle off and remove the sleave, remove and rotate the guts. Try 90' at a time. Turn water on to try it. Useually one of the other 3 positions will be right. The correct position is there, but it may take time to find it.

Feel free contact me again!
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Thank you,
Harvey your Master Plumber