Question about Delta & Single Handle Shower Faucet

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My shower goes from warm to scalding and then to cold without any adjustment to the controls...is this a hard water problem? is this a common problem? my faucets were installed 1 year ago.

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Hi,
No it more then likely is because of fluctuating pressures...this could be because of other water usage in the house or even in the water entering the house...to see hwat it is the water pressure would need to be monitored at different locations to find the source of the problem...likely if it happens when somewhen else in the house flushes a toilet then you know where it is...

heatman101

Posted on Aug 05, 2010

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they can be adjust but if this problem has come in after a period of time then the sensor wax inside the adjuster is not as it should be.
they do fail and need replacing
most plumbers put the unit on the hot water outlet because they are lazy as the standard says that it is primarily for use on the shower, bath, basin systems and wash machines and kitchen sink are not required to be temp controlled.

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If you are using a conventional shower valve of recent manufacture, there is a safety feature to prevent scalding accidents when it is connected to conventional plumbing on a pressurized system. If there is no cold water pressure against the valve, it shuts off the hot water completely. It is called a pressure balancing valve by most manufacturers.

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http://www.deltafaucet.com/media/Product_Tech_Docs/Maint_Installation/50001to80000/51975RevH_4.15_15e05.pdf

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The mixer valve has a torn seal. You'll need to remove the spool.

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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?

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