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you have to tell me more is it single lever or hot and cold hot and cold have stems with rubber washers in end they are held in place with a crown nut ( big as half dollar) FIRST AND FOREMOST TURN THE WATER OFF AT THE BASE THIS GOES FOR HOT AND COLD I if you have a single lever faucet you have to remove the handle( also true for hot and cold faucets) after the handle is removed on single lever you have some type of crown ( looks like a rocket nose cones ) usually it is screwed on and holds some type of cartridge or ball anyway you use a wrench called a channel lock or vice grip to take apart i need more info before i can tell you more
Hi Steve-If the faucet is definitely getting water (making sure all the cut-off valves are open along the way), the Moen single handle faucets all use a replaceable cartridge that is available at home supply stores. This cartridge is what regulates the pressure and the temperature of the water coming out of your faucet. This is likely faulty. You'll need to close the supply valves (hot and cold) underneath your sink prior to replacing.
If I understand correctly, you have single handled shower faucet. Normally there is a wait for hot water to arrive at faucet. But now hot water is already at shower faucet.
Single handled faucets have a mixing area inside valve where hot and cold come together before going into sink. This mixing valve can have crossover where the hot and cold can pass through to each other even when faucet handle is off. When single handle faucets get old, this can happen. How it happens: For example another faucet is turned on inside house, and pressure differential between hot and cold causes hot water at shower handle to pass through mixing area and into cold water line. So if another faucet has been run, then that lets hot flow to faulty single handled shower faucet. To confirm this is the problem: turn on other faucet and put ear against shower faucet to listen for moving water. This condition may also signal there is a water leak. The problem is not harmful, but will draw cold water into water heater each time, and is energy wasteful. Replace faucet or have plumber repair problem.
All faucets have a hot and cold line input. The single handle units have a mixing valve within the handle. Aside from removing the water lines there is usually some type of connecting bolts for the base plate as well that will need to be removed prior to removing the faucet. Do not forget to turn the shut off valves off at the wall before you remove the water lines.