Leaking hot water from delta single handle facuet

You did not line up the flat spot on the stem before you tighten the set screw down.

the faucet has a scald proof device. remove the handle and adjust.

Faucet is leaking due to seats bad.

1- Turn water off first and remove handle and remove collar that holds stem and remove it..

2- in valve there are seats that looks like caps they may be in valve body or the end of stem itself.

3- Remove them and the springs and replace them this will take care of the leaking problem.

If its a ceramic cartridge type then replacing cartridge is called for, HOWEVER sometimes cheaper to replace complete tap.

If not ceramic then turn mains off and replace the washer inside.

REPLACE THE CARTRIDGE. TURN OFF WATER, REMOVE HANDLE AND FACE PLATE. REMOVE TWO SCREWS UNDER PLATE. PULL OUT CARTRIDGE AND INSERT NEW. REASSEMBLE

If you get 0000 steelwool, This will polish like new without scratching.

The only possible explaination is that the water is finding it easier to go up than down. Water is lazy, just like me. ;)

Use an allen key to remove the tub spout. It's underneath and awkward. Once the allen key is loose, the spout just slides off. Try running the water. This may solve your problem and all you'll need is a new tub spout. If not.....

Turn the water off to the house.

Use an allen key to remove the handle.

Use a phillips to remove the trim plate (2 screws). Cut the silicone around the trim if it's there (which, in a proper installation it shouldn't be, but...)

Unscrew the nut (usually chrome) holding the cartridge into the brass body of the valve. The cartridge pulls straight out. Check for restriction in the ports of the cartridge itself. Check for restriction in the line going down to the tub spout. If you can't find anything, replace the cartridge.

Reassemble & Enjoy!

Remove hot/cold button in handle, remove screw/pull off handle. Remove the two screws in the wall plate/remove plate. Use a wrench to remove the diverter assembly. Get new diverter assy and reinstall eveything. You don't need to turn off the water.

change the cartridge it is bad,it has rubber gaskets on the outside of the cartridge it is worn,just replace it and it should work,it may also be trash in the way.take out and shake,if this does not work replace with new cartridge.

You will need to turn of the water and remove the handle, then remove the large brass or chrome ring behind the center sleave that is behind the handle. now that ring is what holds the cartridge in the valve body, you will need to remove the cartridge the rubber seats and springs will both need to be changed ,you can buy a rebuild kit for this facuet, it has everything you need even the o rings you will find in there . Hope Ive Solved your problem! Thanks