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    amberspapa's Avatar
    amberspapa Posts: 1, Reputation: 1
    New Member

    Mar 23, 2015, 08:43 PM
    I just need to no if its possible for an aav on a washer cause water to back up out of drain tube?it drains slowly also.ran snake through the line and found no clog
    massplumber2008's Avatar
    massplumber2008 Posts: 12,825, Reputation: 1211
    Senior Plumbing Expert

    Mar 24, 2015, 04:15 AM
    Hi amber

    If the AAV was defective and didn't open it could certainly affect how water goes down the drain. The AAV should just spin out and can usually be easily replaced so I'd suggest changing it if possible.

    With that being said, I'd also snake the drain again... if really old metal pipes it may even be time to remove the washer drain pipe and replace with new PVC.

    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber

    Mar 24, 2015, 12:45 PM
    Try removing theAAV and cycle the washer. If it drais then replace theAAV. Good luck, Tom
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert

    Mar 26, 2015, 01:30 AM
    Usually, the overflow occurs if there is undersized drain pipe or clogged drain pipe. Washer drain should be 2" in diameter. See if you can snake it it with 3/8" cable inserted entire length of the cable, usually not less than 30'

    AAV could cause slow drainage if defective. Do as Tom said: remove AAV and see if the drainage improves

    Hope that helps


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