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Old 01-05-2019, 06:47 PM   #1
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Hot and cold water appear to be mixing

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 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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Old 01-05-2019, 06:51 PM   #2
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Have you checked your outside shower to be sure the valves are off, and checked the bypass valves on the water heater?
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Old 01-05-2019, 07:11 PM   #3
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Make sure your interior shower faucet handles are off also. If you have a push button on your hose or showerhead to stop the water from coming out the water can still mix there.
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Old 01-05-2019, 07:12 PM   #4
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I have checked the outside shower. Both hot and cold are turned off.
The bypass valve in the basement area with the outside shower and tank valves is set to normal. Is there a way to check to see if it is working ok. You said valves. is there another valve?

Thanks
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Old 01-05-2019, 07:29 PM   #5
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The inside shower is turned off. I removed the shutoff valve I have on the shower head, but did not fix the problem.
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Old 01-06-2019, 02:45 AM   #6
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There's a check valve on the top line of the water heater where the hot water comes out that may have gone bad causing hot & cold water to mix. If you replace it be sure to use a brass one not plastic. Just a thought.
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Old 01-09-2019, 07:14 PM   #7
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Quote:
Originally Posted by travelin' texans View Post
There's a check valve on the top line of the water heater where the hot water comes out that may have gone bad causing hot & cold water to mix. If you replace it be sure to use a brass one not plastic. Just a thought.

I have attached a picture of the water heater. I don not see a check valve.

I followed the tubing as far as I can see it and did not see a check valve.
is it there and I am just not seeing it? Or am I looking in the wrong place?

Thank you.
Attached Images
File Type: jpg IMG_0705.jpg (164.4 KB, 31 views)
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Old 01-09-2019, 07:18 PM   #8
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I have replaced the bypass valve, but I still have the problem.
So far I have discovered if I turn on any faucet to hot or cold, the shower has hot water. I am checking to see if any other faucets will have hot water if another faucet is turned on.
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Old 01-09-2019, 08:51 PM   #9
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I have learned the check valve is the fitting connecting the tubing to the water heater.
I will get one and replace it.
Thanks
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Old 01-09-2019, 10:55 PM   #10
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Quote:
Originally Posted by Terry and Nina View Post
I have learned the check valve is the fitting connecting the tubing to the water heater.
I will get one and replace it.
Thanks
Yep! That brass fitting with the red pex piping is the check.
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