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.
Delta shower faucet no cold water.
See illustrations to reduce outlet temperature.
This cartridge contains a pressure balancing valve that sometimes fails thus preventing cold water from flowing out of the shower head.
Learn how to troubleshoot your shower faucet.
The solution is to replace the cartridge.
Make sure cold water flows from the valve first and does not exceed 120 degrees fahrenheit at the hottest flow.
Removing and replacing the cartridge should fix the problem.
So are you feeling handy.
Begin troubleshooting by checking other faucets around the house.
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.
Make sure water at the hottest flow does not exceed the temperature allowed see steps 1 4 above.
I ve tried a new cartridge.
I have a single handle delta shower faucet with no water coming out.
Has worked for years suddenly not even a drip.
No cold water in shower.
Lack of cold water is usually caused by a defective pressure balancing valve in a cartridge.
This is a more involved plumbing problem and you will likely need to hire a plumber to fix it.
Cold water supply line for delta single handle shower faucet is suddenly clogged no cold water.
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.
Important points to remember.
With a few tools and some patience you may be able to replace the valve cartridge on your own.
Removed valve and attempted to blow compressed air back up line to nearby sink hot and cold work fine.
This part is located inside the shower faucet.
Covered the showerhead pipe with ducttape and blew on the tub spout tough to blow but air is moving back into the valve.
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.
Took apart the old cartridge guts reinstalled still no water.