Water hammer after new washer part installed

Discussion in 'General Plumbing Help' started by Airwolf, Dec 11, 2018.

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  1. Dec 11, 2018 #1

    Airwolf

    Airwolf

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    I've never had an issue with water hammer in my house until a couple months ago. The fill valve on our newer LG washer went bad. Because we had the extended warranty I just called the company and they sent a tech. He confirmed it was the fill valve and replaced it the next day. Ever since that part was replaced we now have a water hammer problem at the washer. I think it's just the cold line. I thought maybe the water line valve was open too far so I closed it a few turns. The hammering isn't as severe now but it's still there. It also hammers when I go to shut the water line off (turn type valve, not a ball valve) completely, which it never did until after he installed the new fill valve on the washer. I also turned back the water line valve to the whole house just a little thinking maybe the water pressure was too high. Don't know if that would do anything or not. I bought a water hammer arrester that just screws onto the water line behind the washing machine but I haven't installed it yet. Just wondered if anyone knew what would cause the hammering to start after replacing that part, or if it's just a big coincidence. I don't know much about water hammer, this is the first time I've had to deal with it. Thanks in advance for any input.
     
  2. Dec 11, 2018 #2

    Geofd

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    there is science behind it...but I cant explain that its usually caused by solenoid valves some faucets will do it try the hammer arrestors on your washing machine and see what that does
     
  3. Dec 12, 2018 #3

    CT18

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    Water hammer usually happens on quick closing valves. The new fill valve may close faster than the old, and now you get the hammer. Try the shock arrestors, you could also close the main valve and drain the system. You may have hammer arrestors somewhere else on the system and they are full of water.
     
  4. Dec 12, 2018 #4

    frodo

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    you can find it at homedepot

    water_hammer.png
     
  5. Dec 12, 2018 #5

    Diehard

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    OP already bought a water hammer arrestor that just screws onto the water line behind the washing machine but hasn't installed it yet.

    I always wondered if this Oatey version had a separation between the air chamber and the water side. Just checked into it and thought I should share the information. (Particularly since some plumbers still recommend simply installing a short length of pipe, that would trap the air and act as a water hammer arrester. As many may know, that doesn't last since the air gets absorbed into water over a relatively short period of time.)

    Included in their specifications, it reads, "Arrestor shall be made of lead-free copper and include a polypropylene piston with two NBR O-rings."

    So it won't last forever but it's reasonably designed for the price.
     
  6. Dec 20, 2018 #6

    Airwolf

    Airwolf

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    Thanks for the replies! I installed the Sioux Chief arresters and they made a world of difference. Hammering isn't totally eliminated but it's really close. Way better than it was before. Not sure what caused this issue to start happening after the washing machine fill valve was replaced. It wasn't an issue before that. Anyway, the arresters fixed it for me. The machine is an LG, which insiders are now telling me isn't a great appliance brand. So I guess when this one fails I'll get something with a better reputation.
     
  7. Dec 21, 2018 #7

    sawsaw

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    Relax on your LG selection. It's been a top performer for a number of years in Consumer Reports. I reviewed washers relentlessly early this year and reached a decision that the LG was the best out there... However, keep in mind, the life of any washer today is being stated as 5 - 7 years. Our LG is louder than our previous Kenmore, but it is not as bad as reported on other brands. I got the LG which has the "extra water" feature, which my wife really appreciates. No, I had no issue with water hammer.
     
  8. Dec 21, 2018 #8

    Diehard

    Diehard

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    Yeah, they certainly don't make them like they used to.
    I just had the wife look up the age of our current washing machine.(Maytag)
    33 years old. She seems to remember one service call.
    The one before that was about 20 years.
    Yup 2 washing machines in 33 years and 1 wife.:)
     
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