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Thread: Pump stopped pumping

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    New2water's Avatar
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    Pump stopped pumping

    My pump was working fine until yesterday. It stopped pumping water without any change.
    Symptoms:
    Pump runs and there is a whirl action visible in the basket.
    There is no pressure in the cartridge filter. No air comes out of the air bleed valve in the pressure gauge.
    There is miniscule quantity of water flowing from the valve on the pump outlet. So it is not the filters possibly being clogged.
    The strainer cover does not show water or air bubbling.

    Troubleshooting steps I have taken include:
    1- Cleaning the straining basket before the pump.
    2- Tried various sources for inlet - spa, pool bottom, pool top, skimmer without any difference.
    3- Tried various output options - spa, pool - no change.

    Any ideas?
    Thank you.
    18K gal in ground, Plaster, three 1 HP WhisperFlo WFE-4 pumps (Pool, Hot Tub, Waterfall), 320 sq ft cartridge filters, MiniMax Plus HP 400 heater, TF-100 test kit, Kreepy Krauly Classic cleaner

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    Smykowski's Avatar
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    Re: Pump stopped pumping

    Classic symptoms of a clogged or broken impeller. You have to take it apart to get to the impeller, but the good news is, this may be a cheap/free fix.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Pump stopped pumping

    When you turn the pump back off, is it still full of water? What happens to that "vivble swirl action" of water when you turn the pump on....where does that water go and what remains in the pump basket....air or water?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    New2water's Avatar
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    Re: Pump stopped pumping

    Followed the advice and opened the pump body. The impeller does not appear broken or clogged. Found two possible problems. The pump diffuser O ring is loose/worn out and was not sealing the diffuser against the pump body. Secondly, there was a glob of white silicon looking material in the body. It must have been there from earlier since it is too large to pass through the pump basket.
    When I run the pump, water keeps swirling and what remains in the basket is both water and air. A little amount of water flows back to the hot tub where the output from the filter is directed. The pump is not pulling much water.
    I have a second pump of the same model/size (Pentair Whisperflow WFE-4) for the waterfall. Should I move its diffuser and O ring to the defective pump?
    18K gal in ground, Plaster, three 1 HP WhisperFlo WFE-4 pumps (Pool, Hot Tub, Waterfall), 320 sq ft cartridge filters, MiniMax Plus HP 400 heater, TF-100 test kit, Kreepy Krauly Classic cleaner

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    Re: Pump stopped pumping

    YOur pump is not priming. I think you have a suction side air leak. Somewhere between the skimmer and the pump, air is being drawn into the system. Find that leak and the pump will prime.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    New2water's Avatar
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    Re: Pump stopped pumping

    Can't find the O ring locally so had to order it online. I will put the pump back together when I get the part, try to find the suction leak and report back. Thank you for your help.
    18K gal in ground, Plaster, three 1 HP WhisperFlo WFE-4 pumps (Pool, Hot Tub, Waterfall), 320 sq ft cartridge filters, MiniMax Plus HP 400 heater, TF-100 test kit, Kreepy Krauly Classic cleaner

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    New2water's Avatar
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    Re: Pump stopped pumping

    Ultimately, it was the O ring in the cover of pump inlet basket that was not sealing. Replacing it with a new ring did the trick and the pump is now fully pumping.
    Thank you all for your ideas and guidance.
    18K gal in ground, Plaster, three 1 HP WhisperFlo WFE-4 pumps (Pool, Hot Tub, Waterfall), 320 sq ft cartridge filters, MiniMax Plus HP 400 heater, TF-100 test kit, Kreepy Krauly Classic cleaner

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