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We don't get any hot water when turning the handle to the hot water side - only cold water comes out when turning to any side. It also appears that when turned to the maximum hot less water comes out. The faucet is a Moen posi-temp
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Who ever hooked the pipes up to the tap they put the cold pipe on the hot side of tap. Same the other side. You need to change the pipes to opposite side of tap.
I don't know if you had the mixing valve out or got it turned around but, try taking the handle off and operate the shower without the handle, in other words, turn the valve so the left side of the valve is now in the up position and just stick handle on and make sure you have your full range and hot and cold water. Two other possiblilities are, if you did not runwater before installing new valve, you may have gotten trash form the lines, plugging your valve. If you can't resolve the problem by mearly turning the mixing valve, you may want to remove it, make sure it's nott plugged and turn it 180 deg: http://www.youtube.com/watch?v=J-SNBNijfQc
This is a video on how to remove the valve.
You have a obstruction in cold side turn off both cold and hot water to faucet then disassemble cold side(take note of how you take apart it must go back correctly) slowly open cold water stop to see if you can dislodge obstruction(use a towel over cold water handle assembly to keep from water shooting everywhere).
Best solution is to remove the circulation-system crossover located under sink and see if problem is solved. After removing crossover piece, try hot water tap. Another way to check if this is the problem: Turn off cold water shut-off located above water heater. No need to turn off power or gas to water heater. Now, no water should flow when you turn on hot water tap because hot is turned off. Open hot water side of double handled faucet. If water still comes out the hot side, then crossover is the problem.
After removing Taco crossover, you can still have the problem if a single handled faucet has the same type of crossover issue. Repeat test to see if water comes out of hot side when water to water heater is shut off. If water still comes out of hot side, then put ear against each single handled faucet and see which one has sound of moving water. That will narrow down the suspects.
1st Check the temperature restricting coller behind the cover under the handle. It is used to restrict the flow of hot water to stop you from being scaulded.
2nd Those set screws will control the flow. Check to ensure both sides are open the same amount of turns. If the water pressure is good turn in the cold side.
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