Question about Moen & Posi-Temp Single Handle Shower Or Tub Valve

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Water flow stops and starts

Water flow in shower comes almost to a complete stop for few seconds and then comes back full force again. Kitchen sink just did it but happens rarely.

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  • lamplighterw Apr 24, 2009

    We have town water.

  • lamplighterw Apr 24, 2009

    water supply adequate - can't check pressure now - have no hose - leaving town for a while (vacation home) - appreciate trying to help - will post again when we return since I can't work on it for a while.

  • heatguy May 11, 2010

    ok now i dont suppose you have a pressure gauge in water line if you do whats the pressure ?if you dont you can take a short hose outside aim it straight up and see how high it goes and i can figure the pressure if you give me the height.my other question would be how do you go from tub spout to shower head do you turn a knob push a button ,what make is the shower

  • heatguy May 11, 2010

    what is your potable water supply source ?is it a well?

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Check PRV...Pressure reducing valve......Plugged ro broken.....

Posted on Aug 18, 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.

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?

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