I have a Delta Shower faucet which doesn't mix the hot and cold water. I can only get completely HOT or completely Cold but not in between?? What do I need to replace?

Do you know what model Delt you have and is it a single handle?

Just found out that if the in line hot water is too close to the faucet and is only supplying hot water to this one, I need to bring it to the manufacturer and intall and much lower resistance. That should solve my problem. I will bring it tomorrow and will post results, Thanks everyone

My Girls Dad made this suggestion on a duplicate post.
I would suggest replacing the complete delta cartridge. The cartridge is what does the mixing, so that's is the best place to start.Good luck, bTom