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Old 01-01-2012, 07:01 PM   #1
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Hot/Cold mix question on kitchen faucet


I asked this on another forum, but haven't got an answer.

I helped my neighbor with an American Standard wall mounted two handle kitchen faucet today. I replaced the cartridge because the hot water valve only reduced the flow to small stream.

Here's the weird part. I wanted to be sure it was the hot cartridge that failed, so I shut off the output from the hot water heater. I expected that to shut off the leak in the kitchen, but it didn't. Instead, the leaking water got cold, and when I opened the hot water faucet, cold water came out. The cold faucet was shut off. When I opened the hot water heater shutoff valve again, the leaking water got hot again.

Why did the hot faucet control the cold water when the heater valve was closed? Where did the cold water come from?

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Old 01-01-2012, 07:15 PM   #2
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Hot/Cold mix question on kitchen faucet


Did you replace both the hot and the cold cartridges?

Sounds like both are leaking.

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Old 01-01-2012, 07:28 PM   #3
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Hot/Cold mix question on kitchen faucet


This is kind of a guess, but most new single handle shower valves have balancing valves or balancing spools in them so you do not get a hot or cold gush when water is run elsewhere. I have seen instances when I shut the hot water off, cold would flow through these parts of the shower valve into the hot water lines.
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Old 01-01-2012, 07:59 PM   #4
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Hot/Cold mix question on kitchen faucet


Quote:
Originally Posted by oh'mike View Post
Did you replace both the hot and the cold cartridges?

Sounds like both are leaking.
No. Actually one of the tests I did was to swap the hot and cold cartridges. The problem went with the suspected hot water cartridge, and when I replaced it, the problem was entirely gone.

broox - I saw the problem like you described on Ask This Old House a few weeks ago, but couldn't remember the details until I read your post. That sound reasonable; the cold water flowing into the hot line at another valve when hot water pressure is lost. It's not my house, so I'll probably let it go at that
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Old 01-01-2012, 08:13 PM   #5
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Hot/Cold mix question on kitchen faucet


Yeah, it is usually only a problem when you turn off the hot water and the cold has nothing pushing back against it in the valve
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