My price pfister bathroom faucet wont shut off.

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

turn on the shut offs under sink

flip the locking ring at the top of the stem

If you have full pressure on the cold water side and low pressure on the hot side then you well need to remove and clean or replace the cartridge for the hot side. If you have low water pressure on both sides try removing the aerator and cleaning it.
If you need to replace the cartridge on the hot side do both sides while you at it.
Whenever you work on any faucet before you turn the water on remove the aerator and run the water for a few seconds then replace the aerator.

Hi, David pressuming the water flow was good before you put in this new tap, then other than a problem with the tap! have you checked if you have an isolater valve on the pipe work under the unit, if so check that it is fully opened?
Thanks Paul.

yes it should have a flow restrictor in the end of the spout. You might need to clean it out

MOST LIKELY YOU HAVE A CLOG AT THE SEAT ON THE INSIDE OF THE FAUCET, TYPICALLY SAND, PEBBLES, OR PIPE SEALANT. TURN THE WATER OFF, UN-SCREW THE HANDLE, REMOVE THE SET SCREW LOCATED INSIDE THE HANDLE BODY, PULL THE HANDLE BODY UP, LOOSEN THE NUT, REMOVE THE SEATS AND STEM AND UN-CLOG THEM.

Sounds like there is loose solder in the supply pipes. You would have to disconnect the flexs and blow it out.

This sounds like a proper with your water heater. If you just installed this new shower head. First take it off and make sure that the hot water valve is opening fully if that checks out then go to the water heater and make sure the pipes check out ok and also that the heater is ok. Try putting a water heater blanket on it. Also try getting some pipe cover and cover the hot water line so on really cold days or not you will have warmer water

I had the same problem. The Price Pfister web site recommends removing the handle (unscrew the dome cap, then remove the phillips screw to get the handle off) then tightening the retaining ring (I used channel lock pliers on largest setting. It worked. However the retaining ring is plastic on some models, and they recommend replacing it with a brass one. I haven't taken that step yet, we'll see how it goes (mine is plastic).