If the water is running from the bathtub faucet and not from the shower you may have a broken regulator valve inside the pipe system.
Delta shower faucet no cold water.
If there s no cold water in your shower but cold water comes out of every other faucet just fine then the problem lies in the shower faucet cartridge.
I suspect the hot and cold water lines were inadvertently swapped but the plumbing is in the wall and not accessible so for this single handle delta monitor shower tab faucet it can easily be.
Covered the showerhead pipe with ducttape and blew on the tub spout tough to blow but air is moving back into the valve.
This part is located inside the shower faucet.
Cold water supply line for delta single handle shower faucet is suddenly clogged no cold water.
See illustrations to reduce outlet temperature.
Make sure cold water flows from the valve first.
The solution is to replace the cartridge.
Has worked for years suddenly not even a drip.
Make sure cold water flows from the valve first and does not exceed 120 degrees fahrenheit at the hottest flow.
Important points to remember.
So are you feeling handy.
Removed valve and attempted to blow compressed air back up line to nearby sink hot and cold work fine.
I have a single handle delta shower faucet with no water coming out.
Begin troubleshooting by checking other faucets around the house.
The most likely cause of your problem is a defective pressure balancing spool which is a part of the cartridge inside your shower faucet.
This cartridge contains a pressure balancing valve that sometimes fails thus preventing cold water from flowing out of the shower head.
Took apart the old cartridge guts reinstalled still no water.
H and c both have full pressure coming out of valve.
If you re having an issue getting cold water in your shower fixing that problem is going to become critical to your happiness when the weather gets warm.
I ve tried a new cartridge.
Removing and replacing the cartridge should fix the problem.
This is a more involved plumbing problem and you will likely need to hire a plumber to fix it.
Learn how to troubleshoot your shower faucet.
Make sure water at the hottest flow does not exceed the temperature allowed see steps 1 4 above.