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Water Surge Making Pipes Knock

We recently replaced our old washer with an LG Steam Washer 2487. When this new washer fills with water, it sucks water in intermittently at first, causing the water pipes to knock very loudly. Aside from cutting our wall open and fastening the pipes down do you have any other suggestions?

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  • Anonymous Apr 21, 2009

    Just replaced our Amana wahser and Dryer with LG front loaders. We love the machines, but the pipes start a number from the "Blue Men Group" on our pipes...

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What you are describing is called "water hammering" and is caused when a water valve shuts off quickly. The momentum of the water moving within the pipe causes the pipe to bang when it comes to a sudden stop. Plumbers can install an air chamber to absorb the water hammer (just like a shock absorber) but you might try ones that you can just screw onto the hoses behind the washer. I have seen them at places like Home Depot in the plumbing department. (hope you can find someone who actually knows what you are talking about to help you find them) Alternately, you may be able to find them at a hardware store or appliance parts supplier.

Posted on Feb 01, 2009

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There are Hammer Arrestors made to eliminate (or lessen) the hammering.

You should also bleed the air from the pipes - and re-prime them.


Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question

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