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

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Not enough hot water in one of my showers.

The people that lived here before had three kids and i was wondering if maybe there is something in the faucet that controls the hot water so that kids don't get burned. i don't know the brand of the faucet but it has one handle to turn the water on.

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  •  Jerry
    Jerry May 11, 2010

    The maximum water temperature on most pressure balancing shower faucets can be adjusted, but the method for adjusting varies greatly depending on the make of the faucet. On Moen Posi-Temp valves, for example: - remove the handle - you should see a temperature limit stop which looks like a plastic ring with a pointer on it - pull the stop out, you will notice it has "gear-like" teeth on the back half - rotate the stop counterclockwise for hotter water, clockwise for cooler - reinsert the stop and reassemble the handle Try to locate the make and model of the shower valve for a more detailed and accurate solution.

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Turn the temperature down on your hot water tank to prevent scalding from all faucets.

Posted on Sep 13, 2009

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1 Answer

Does not supply enough hot water


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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My shower only stays hot for a minute and then goes cold even though the hot water works everywhere else. I have a hot and cold tap and a third one to direct to shower or tub.


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I have a Grohe shower system that has the temperature control it was working fine and now the water only comes out luke warm. the handle goes from 65 degrees to 110 degrees. I live in a older highrise...


WEll, the question is do your sinks have water that is hot enough? If no, perhaps your water heater is set too low. If yes, many shower controls have hot limiter and if you pull the handle, often there is a spline assembly that stops the travel from going hot, adjust to allow more.

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I have to turn on lavatory faucet at the same time I'm running the shower so when I taking a shower the water doesnt go from hot to cold. It seams that maybe the hot water demad that the shower requires is...


This is not an uncommon problem with 'flash heaters' of this type; for safety, they all require a certain minimum of flow before the gas supply is turned on. Some brands/models have a factory-set adjustment for the minimum flow rate.
You might locate the mfr.'s website, contact them and describe your problem. This can also be caused by the modern flow-limited shower heads not allowing enough water to flow to keep the heater turned on.
If you have a retired shower head, you might try replacing the one currently used to see if it allows enough flow to allow proper operation. Either way, it is a waste of water.

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Water becomes ice cold in the middle of a shower


Sounds like you have a problem with water flow. Since your ground water is warmer in the summer, you mix less hot and more cold in order to get the same warm temperature. If your hot water flow gets low enough, your tankless will start to "short cycle" in order to prevent scalding. Use one of these three methods to increase your water flow at the shower:

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I think some shower valves have a safety setting to prevent burning. maybe you could adjust that to be hotter.

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Please rate. Thanks jj505

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Bathtub water does not get hot enough-


take off handle and you should see a nylon ring with teeth just take off and put back in the oppisite direction that you removed it its there to prevent kids from getting burnt

Feb 27, 2009 | Plumbing

3 Answers

Water is either hot or cold - no in between.


I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

Nov 28, 2008 | Water Heaters

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