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Old 12-01-2010, 12:34 PM   #1
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dishwasher makes pipes rumble


Lately (last few months) when we run the dishwasher, during the first cycle (and a few times in the complete cycle) the pipes in our house will rumble REALLY LOUD - like a jackhammer for about 3 minutes each time.

If I turn on the water in the sink, the noise will stop. Once I turn the water off again, the noise starts up.

Before I call a plumber, does anyone know what this is called? (water hammer, maybe?)

And is there anything I can try before calling a plumber?

Any help would be GREATLY APPRECIATED!

Thanks.

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Old 12-01-2010, 12:50 PM   #2
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dishwasher makes pipes rumble


It sounds like a cycle in the dishwasher might be switching the water on and off very fast. Maybe it's it's way of controlling flow?

Install a water hammer arrester somewhere on that line and you should be good. At least that's my thoughts, see what the others have to say.

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Old 12-01-2010, 04:13 PM   #3
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dishwasher makes pipes rumble


Red Squirrel is correct. Water hammer can cause problems in other areas of the home as well. Water hammer arrestor is basically a vertical pipe with trapped air that acts as a cushion to the water when the solenoid valve snaps closed.
Since the problem just started it could be your pressure regulator has failed and allowing an increased pressure.
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Old 12-01-2010, 08:04 PM   #4
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dishwasher makes pipes rumble


water hammer is caused by the rapid closing of a valve. obviously if the dishwasher is causing this for extended periods of time it's something wrong w/ the dishwasher. the solenoid valve that controls hot water flow is probably broken. don't waste your time with hammer arrestors, get the problem fixed
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Old 12-01-2010, 08:56 PM   #5
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dishwasher makes pipes rumble


...another vote for water hammer!

If it was the dishwasher, then why would the fauceet being turned on make the noise go away?

And I also agree that you need to check the water pressure too. If it's over 80 psi, you need a pressure reducing valve replaced and/or/ installed.
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Old 12-01-2010, 10:08 PM   #6
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dishwasher makes pipes rumble


Quote:
Originally Posted by Plumber26 View Post

If it was the dishwasher, then why would the fauceet being turned on make the noise go away?
I didn't say it wasn't water hammer, what i said was that the dishwasher is obviously the cause of the problem. it goes away when you open the faucet b/c the shockwave has someplace to go, not just bouncing around in the pipes. a hammer arrestor might fix it for awhile, but the solenoid valve will continue to fail and eventually need to be fixed, so why put a bandaid on it?
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Old 12-01-2010, 10:14 PM   #7
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dishwasher makes pipes rumble


I agree its water hammer. But I think the dishwasher is the ploblem. Perhaps an appliance repairman first before a plumber. The hammering has only been in the last few months so your PRV has failed or you have a solinoid issue in your DW.
Also, try posting this in the appliance forum before you call in any repair folks

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