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