Check the placement of the valve,, it may be 180 degrees out,, also,, try it with the shower head off, it may be clogged
A metal ball controls the temperature and flow of water from the spout in the vast majority of Delta single-lever faucets. That ball rests on three rubber seals, each seal suspending the ball with a single spring. Over time, wear on the seals, the springs and even the ball itself typically results in leaks. Thankfully, repairing the faucet is relatively simple, and Delta even makes repair kits with the replacement parts needed for each model.
Turn off the valve that controls the main water supply. The valve is located next to the water meter, inside or outside the house, and must be twisted in a clockwise direction.
Remove the plastic cap from the center of the faucet's handle by prying the cap free with the blade of a dull knife or a flat-head screwdriver, then remove the screw in the center of the faucet handle with a Phillips-head screwdriver. Pull the handle off the faucet assembly to remove it
Remove the single bonnet nut that surrounds the faucet valve with an adjustable wrench. Grip the bonnet nut at the base, which is ribbed to give the wrench a surface to grasp, and turn in a counterclockwise direction to remove it.
Remove the circular, white plastic cam that surrounds the top of the faucet, pulling it off and revealing a rubber seal, which you also remove. Next, pull the metal ball out of the faucet assembly and pry out the ball's supporting rubber seals and their springs with a screwdriver (the springs slide onto the bottom of each seal, so they will come out along with the seals).
Slide one replacement spring onto each of the three replacement seals that come with the Delta repair kit for your faucet model, then insert each seal into the assembly. Insert the replacement ball from the repair kit, then cap it by putting the replacement rubber seal over the ball, followed by the plastic cam
Place the bonnet nut over the faucet valve, then tighten the nut with an adjustable wrench. Position the handle onto the end of the faucet, then insert a screw into the center of the handle, tighten it with a Phillips-head screwdriver and, finally, press the decorative plastic cap over the screw.
Turn on the valve that controls the main water supply by twisting the valve in a counterclockwise direction to complete the repair
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