Thump sound when turning on the water, (kitchen faucet)

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by djryval, Nov 14, 2007.

  1. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    I have a brand new delta faucet (kitchen sink) but when you turn on the water, sometimes you get a thump. It doesn't do it every time, just maybe 2 or 3 times a day. I can't seem to duplicate it if I turn it off and on repeatedly. It also seems to happen when you run it on the hot side as opposed to the cold, and usually occurs if I let the faucet sit for a while before turning it back on again. Does anyone know what causes this or if it will lead to problems later on? Should I just a leave it be? Thanks.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    It could be from the divertor...may not be a problem other than an annoyance.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    Ok. I wasn't sure if this is "normal" behavior or not, as long as it won't cause any premature problems then I'm fine with it.
     
  5. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    turn thesprayer on when faucet is running should solve your problem.
     
  6. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    I tried that but it still seems to have the problem here and there. Problem is I can't figure out the pattern to duplicate it so I could show the plumber. Thanks for the suggestion and I'll try it a few more times to see if helps.
     
  7. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    Divirter is sticking give a modal # could help me help you.
     
  8. xfiveo

    xfiveo New Member

    Joined:
    Nov 17, 2007
    Location:
    Washington
    Help...I'm having the same problem!!!

    I am having the same problem with my kitchen sink faucet. Here are the details:

    My home is about 5 years old and the standard/plain kitchen faucet is original. There is no side sprayer. There is an air expansion tank coming off the hot water line just above the water heater.

    When we turn on the water handle full blast to the hot water (left) side, a series of fast thumps occurs (resonating down the pipes throughout the house) and the water coming out the faucet pulsates. If we lower the speed of the hot water coming out about 50%, or if we start to turn the water handle towards the cold water side, the thumping stops and the water coming out flows normally.

    The problem has grown worse over the past year. It used to occur only after the hottest water was running full blast for several minutes. Now, it happens immediately and even on semi-hot water.

    Let me know if you need any other information. Any advice would be much appreciated, as I am a plumbing noob and don't even know what a "diverter" is. Thanks!
     
  9. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    the divertor does what the word sounds like...when you have a sprayer on a kitchen faucet (or say between the tub and shower), you only want water to go to one place at a time. The divertor is what switches the water to go where you want it. In a kitchen sink sprayer, when you open the sprayer valve, it changes the flow by pressure changes and the divertor moves to block off the spout.
     
  10. xfiveo

    xfiveo New Member

    Joined:
    Nov 17, 2007
    Location:
    Washington
    Thanks for the explanation on a diverter. So...what could the problem be if I do not have a sprayer (diverter) on my kitchen sink?
     
    Last edited: Nov 17, 2007
  11. p95dc

    p95dc New Member

    Joined:
    Sep 5, 2009
    Location:
    Nashville, TN
    Thumping Problem - Possible Solution

    I had this same problem on the hot water side of our kitchen faucet until recently. It also occurred when the dishwasher was running...even more so. I finally figured out that the supply valve on the hot side under the sink was not fully open. After opening this valve as far as it would go, the problem went away.
     
  12. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    clunk

    You have a leaking spray hose. When you turn the water on, the faucet thinks you have the button on the sprayer pushed down and sends the water into the spray hose. It immediately realizes its mistake when it only takes a few drops of water to refill the hose so the diverter reverts to its normal position. But by then you have heard the CLUNK.
     
  13. flamefix

    flamefix New Member

    Joined:
    Sep 4, 2009
    Occupation:
    Heating engineer in the UK licensed to fit service
    Location:
    Exeter, England
    Do these taps have washers on to seal the faucet off from the water when opening and closing? Sometimes these washers or the jumper are loose and they can cause the same sound you are hearing. If they are a ceramic disk type then they wouldn't be the cause.

    My 2cents fwiw
     
  14. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    faucet

    Delta faucets do not have "washers or jumpers" so that is not the cause of the sound.
     
  15. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    I never have been able to fix this problem but it's still makes the thump every day when I first turn the water on in the morning and usually once in the evening. If you keep running the water frequently it seems to stop, only when you let the sink sit for a little while such as overnight.
     
  16. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    thump

    REplace the sprayer head. Overnight it lets some water drain out of the hose and that water has to be replaced when you turn the faucet on for the first time, which causes the thump.
     
  17. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    Ok, I will see about trying that asap. Even if I never use the sprayer do you think that just replacing the head will fix the problem? Thanks!
     
    Last edited: Jan 12, 2010
  18. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    sprayer

    It has nothing to do with whether you use the sprayer or not, however, if you do NOT use it, (or do not care if the water runs from both the sprayer and the spout when you do use it), then remove the diverter and that will also cure the problem.
     
  19. djryval

    djryval New Member

    Joined:
    Nov 14, 2007
    Location:
    Georgia
    Thank you!
     
  20. perri

    perri New Member

    Joined:
    Jan 16, 2010
    Location:
    Houston, TX
    Thumping sound in kitchen faucet

    Installed a new faucet and sprayer 2 weeks ago. Initially concerned because sprayer seemed very weak. After a few days a small leak developed at the sprayer head. Disassembled/reassembled sprayer. Now sprayer works great, leak is gone, but the faucet (hot or cold) makes this continual, awful thumping sound when it is turned on--stops when sprayer is used. Dishwasher does not create the noise. Have cleaned aerator. What to try now?
     
  21. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    thump

    Replace or clean the diverter to the spray. IF the clunking continues replace the sprayer head, don't just clean it.
     
Similar Threads: Thump sound
Forum Title Date
Plumbing Forum, Professional & DIY Advice Thump, Thump sound from the water pipe Mar 24, 2020
Plumbing Forum, Professional & DIY Advice Water line Thumper Jun 12, 2020
Plumbing Forum, Professional & DIY Advice Thumping and leaking side sprayer Nov 1, 2017
Plumbing Forum, Professional & DIY Advice Sink Thumping Apr 1, 2016
Plumbing Forum, Professional & DIY Advice Kitchen thump Jan 4, 2015

Share This Page