Question about Moen 3175 Legend One Handle Shower Faucet With trol Pressure Balancing Valve....

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Not enough hot water, has to do with a shower valve

Ok, I just installed a 50 ga LP hot water tank and I still don't have enough hot water for 1 person to take a 8 min shower and at the end of the shower cold is turned completely off and only hot know is on. I believe it has to do with a newly installed shower valve. If I go to the shower valve and turn cold water on, it runs fine. If I turn hot water on it runs fine. If I go to the hot water tank and turn hot supply off to the house and go back to shower and turn the hot water on it is dry if I turn cold water on it just barely trickles out. The valve is a single handle moen turns counter clockwise starts on cold and turns to hot.

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Take off handle (screw under cap) there is a plastic peice behind for ajustment if you move it one way it allows more if you move the other way less contact me if you have problems thank you for useing fixya please rate me

Posted on Feb 21, 2009

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Hello, first if any water supply hot or cold is turned off, you will experience trickling as you mention. You must have both cold and hot in order to adjust the temperature on your valve. if you had a plumber intall this unit you should ask him to adjust it. Otherwise here is how:
Rotate the handle counterclockwise to stop and let water run till cold water is purged, check
temperature. Rotate handle to off, remove handle parts (see Disassembly in your manual) and temperature limit stop, rotate clockwise to decrease and counterclockwise to increase maximum hot water temperature, reinstall temperature limit stop and handle (TIP: Do not screw handle in until desired maximum temperature is achieved) Repeat steps until desired maximum
temperature is achieved

Posted on Feb 21, 2009


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It's doubtful your water heater unit is the problem. There is simply no reason for it to only work on sinks unless some how the pipe size was drastically reduced coming out of the unit so sinks got plenty of hot water but the shower does not. Take a second look at the installation. The pipe should not be less than 1/2" coming out. If that's OK then consider a clog or valve problem.

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I bet you don't drain your tank every year. It accumulates something a little like sand . it may have been low enough to "suck" up some of this trash into the hot water lines and then to your valve and shower head. I would start with the head itself a good long soak in vinegar. If you have a spare shower head or hand shower head, I would let it sit for a week. While you have the "tempory" head installed, you can find out if the valve has been affected. Hopefully not. But if it is still slow flow, the trash may have accumulated in the valve. If that is what it apears and you have been considering a new valve now is the time. You may be able to flush it out with a direct connected garden hose. A "reverse flush would be the first try.

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If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor.

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He may have put the mixing valve in backwards. This is very easy to do because it will let some warm water through and at least enough to trick the installer that it had hot water when tryin it out. Also is the shut off valve opened completely? Did he by chance close off the water heater valve also or tank not on just still warm? If other areas are normal you know it's at that one valve and my guess would be the actual valve body or shut off issue. There is also the chance of a faulty valve, damage from install, got to hot if soldered with valve in body and was damaged, debris in valve from pipes. But start there and verify that you have hot and cold to the valve, then if you do shut off system and try flipping the valve around.

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Open following links for details how to test and clean tank and test elements:

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