Question about Moen & One Handle Tub & Shower Faucet

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Shower water temperature regulation

The water temperature in our shower too quickly goes from warm to cold. This is not related to the water heater (since the sink faucet in the same room does not have this problem) so I'm guessing that it has something to do with the mechanism that controls the mixing of the hot and cold water.

Posted by frsledwards on

  • Anonymous Mar 19, 2014

    The water is warm then goes cold

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The temperature is adjustable. The valve has a disc you pull off the front of valve and then rotate the seat I believe counter-clockwise. If you get the paperwork for this valve from moen it is very explanatory. I can help further if needed, Let me know!

Posted on Nov 11, 2009

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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.

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