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Surge of cold water while Showering

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  • #16
    My question would be what if anything has been changed or added to this system? Are the faucets being used at the same time and if so is it the upper unit or the lower unit getting cold water? If running the faucet by it self will it turn cold when lav faucet is turned on to hot side, middle.cold? The more info the more likely to finding out whats causeing the problem.

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    • #17
      Could be anything that combines the hot and cold. Could be someone in the complex has installed a wye for something and shut the water off beyound the wye. That will allow the higher pressure of the cold line when the hot is running to back-feed into the hot lines.

      Could be a wye for an old washing machine, or used for a variety of purposes. I found this problem once about 15 years ago.

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