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TOPIC: Hot and cold water appear to be mixing

Hot and cold water appear to be mixing 2 months 2 weeks ago #1

From all faucets, the hot water is only luke warm. Does not change if the water heater is heating with propane or electric. I have found that if I turn the bathroom faucet on hot and let it run, cold water comes out, but the shower hot water is hot. As soon as I turn off the bathroom faucet, the shower goes back to luke warm. This problem just started this week.
I have verified the outside shower valves are shut off. I also removed the shutoff button from the inside shower.
I have searched the forum and online, but haven't found anyone having this issue. Any help would be greatly appreciated.
Thank you,
Terry

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Hot and cold water appear to be mixing 2 months 2 weeks ago #2

  • Tony Lane
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This almost sounds like your winter bypass valve is partially open and water is bypassing it.The wintering lever may appear to be in the correct position but it is not. I would suggest you check to make sure that it is not in a partial bypass.

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Hot and cold water appear to be mixing 2 months 2 weeks ago #3

Thanks for your response. I have checked the valve, but I will check it again tomorrow. I am wondering if the valve has failed. I ordered a new valve from Amazon today. I will post what I find out.

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Hot and cold water appear to be mixing 2 months 2 weeks ago #4

  • Rtimesoon
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Hope the water heater bypass valve replacement does the trick. Might be a check valve also. Ours has 2 brass ones in all the plumbing lines near the water pump and the water heater. Do you have a pex crimper? Just checking. Not everything is connected by threaded fittings.

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Chris & Maria

2012 36RL, Full Body Paint, Dual Awning, Dual a/c, Splendide Combo, Fisher Paykel dishwasher, 6.5kW Onan, Goodyear G614's.
2015 F550 6.7l, 4X4, Lariat, CC, 176" WB, Long Box, B&W Companion

Hot and cold water appear to be mixing 2 months 1 week ago #5

I replaced the bypass valve. It did not fix the problem. I did not have a pex crimper, but I do now. I also bought a pex clamp remover to get the original clamps off. I have not found the check valves yet. I guess I'm not sure what they look like. I will keep looking.

Thanks

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Hot and cold water appear to be mixing 2 months 1 week ago #6

  • Goat
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They look like this:
www.amazon.com/Valterra-P23415LF-Lead-Fr...a-568617733165&psc=1

And screw into the inlet and/or outlet of the water heater. No affiliation with Amazon.

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Hot and cold water appear to be mixing 2 months 1 week ago #7

Thanks. I do see it now that I know what I'm looking at. I will get one and replace it.

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Hot and cold water appear to be mixing 2 months 1 week ago #8

Check to see if the valves on you your outside shower are turned off

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Hot and cold water appear to be mixing 2 months 1 week ago #9

Problem fixed.
The check valve on the cold water line coming from the bypass valve failed.

Thanks to everyone for helping me to learn that there was a check valve and what it looked like.

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