Installed a brand new moen single handle bathtub faucet. Doesn't matter what I do but the water keeps running. Not only that but it's the hot water that's running I turn the handle all the way to the right to make ice cold, turn off but the water just goes back to hot again. My water bill has tripled, replaced the whole thing and it's still doing it!!!! What do I do???????????????
Are you experienced at soldering? If not, you may have overheated the valve and melted the cartridge, or over soldered it resulting in a small blob of solder interfering with the function of the cartridge. There are two different types of Moen shower valve. One is called Posi-temp and one is called Moentrol. The posi-temp has the anti-scald pressure balance built into the cartridge while the moentrol has a separate balancing spool, and is a far better valve. If you removed the posi cartridge before soldering, you may have torn the gasket when re-installing it. The bottom line is, it looks like you have a bad cartridge which needs to be changed. If posi-temp, I suggest buying a pulling tool. The moentrol has a pulling tool as well, but pliers will work fine on a new valve. Not so with the posi if the gasket is torn. Don't forget to remove the horseshoe shaped retainer clip before pulling the cartridge. Complete instructions are included with the new cartridge.
Something is caught in the stem. Make sure the stem is free of debris. Also check that the valve or cartridge is intact.
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