Cold water only from single-arm shower faucet in master bathroom

the model is needed for a step by step but. if your faucet is for a sink and not a shower then the handles may be connected to the pour spout or separate depending on model and in either case there is a nut screwed under the fixture that hold it in place. do not unscrew any of the faucet until you have turned of the water running to it.

here are links to the different types
Price Pfister Bathroom Sink Faucet Repair

Moen 4570 Handle Fell Off But Then Fixed It Here How

How to remove kitchen faucet

and just in case it is a bathroom fixture

Maintenance How to Remove Replace Cartridge on Single Handle Tub Shower

change the cartridge

If the faucet was working before and then just stopped, it is the mixing valve or a clogged supply line.
turn the water off and remove the mixing valve. Turn the water on and see if you have good flow from both hot and cold ports inside the faucet.
Caution- this procedure can get messy, close the shower curtain or door.
Call Kohler and ask for a new mixing valve for free.

Can you remove handle , behind handle there should be a dial to move to increase hot or cold supply.

Remember where you start and remove it and replace a 1/8 to 1/4 turn counter clockwise, just put handle on try it and see if it changes and adjust accordingly.

adjust ur anti scold the setting is set to low when single handle shower units are shipped they are set in cold mode for safety ur install/instructional paperwork explains such and also advises on how to adjust---remove handle and on shaft will see a blue and red plastic clips that are adjustable slide towards u and move red for more hot water test water continue till comfort level is reached for hot water

Just had this same thing, on this exact faucet. If you still have the manual, it has instructions on how to rotate the valve for back to back installations where one shower has the hot/cold reversed. Our contractor got ours in backwards the first time and I had to call and have them come out and rotate the valve this morning.

bad faucet...get new at lowes or home depot

To clean it, shut off the discharge valve at the water
heater. Then, you shut the valve off of the main water supply. After which, you can start cleaning the single
knob shower cartridge. After the cleaning job, you can
open the discharge valve of the water heater, then, the
valve of the main water supply.

Try draining the system and apply air pressure (min 30psi) to each faucet. Open other hot water faucets to allow pressure to vent. Next try draining and cleaning the hot water tank.

Hi rbyerly,

I'm Harvey the Master Plumber.

Your problem is:
remodeled bathroom,installed new moen valve and hardware. Now water is coming from both the shower head and the faucet when the diverter is in the down postion. Question; Is this a single handle or three handle diverter? Assuming it's a three handle, it should just be a mater of adjusting the center handle. If single, the diverter is in the spout not the valve. I don't know how to direct you further without specifics. Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber