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Old 09-12-2015, 08:32 PM   #1
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Plumbing mystery

So here's the dilemma: when I turn on the hot water faucet (kitchen or bathroom,) I get nice scalding hot water. But when I turn on the cold faucet, I get alternating cold and warm, back to cold, back to warm, etc. I've only noticed this when drawing water from the FW tank and using the pump, but not when using city water. The HW bypass appears to be closed. Any ideas?
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Old 09-12-2015, 08:46 PM   #2
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Plumbing mystery

Have you checked your outside shower. If the faucets are open put the valve at the shower head is closed you can get the water crossing between hot and cold. Not sure why only on the FE tank but could be because the pressure goes up and down with the pump.
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Old 09-12-2015, 08:50 PM   #3
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Pretty much what I was thinking. Only place I know they can cross is through that or the bypass, which was closed.
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Old 09-12-2015, 08:51 PM   #4
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Sounds like the check valve on the cold water inlet is stuck open. You wouldn't notice it on city water because the pressure stays fairly constant, where it fluctuates when running the pump and allows hot water to back out of the heater.
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Old 09-15-2015, 09:00 AM   #5
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Quote:
Originally Posted by Bama Rambler View Post
Sounds like the check valve on the cold water inlet is stuck open. You wouldn't notice it on city water because the pressure stays fairly constant, where it fluctuates when running the pump and allows hot water to back out of the heater.
That's the best idea yet. It's definitely not the outside shower...I had my buddy stand outside and turn them both on while I ran the cold faucet in the kitchen...it immediately became warm (ie, both were mixing out there,) and when he shut them both off, it went back to the fluctuating "cold-warm-cold" pattern. Guess I'll have to look at that check valve. Thanks for the ideas, all!
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