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Thread: Pump on for 30 seconds, off for 30 seconds

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    Jan 2016
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    Coppell, TX
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    Pump on for 30 seconds, off for 30 seconds

    I have a Pentair Challenger Pump and salt water pool with fountain water feature (no spa). The water feature will slow down for 30 seconds and then be normal for 30 seconds, on and on while the pump is on. While looking at the pump, the water is whirling around great for the 30 seconds the pump keeps its prime and then for 30 seconds the water goes down and makes a humming sound but isn't swirling around like it should. I replaced the O ring with lubricant, just in case it wasn't holding the suction but that didn't fix it. I don't think it was the O ring to begin with but I figured it was a cheap and easy way to eliminate that issue.


    Any suggestions? Thanks in advance.

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    duraleigh's Avatar
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    Re: Pump on for 30 seconds, off for 30 seconds

    Welcome to the forum.

    From your description, it is difficult to analyze the issue but you gave me a clue.

    Anytime it is rhythmic, it is possible the pool water is too low and air is getting sucked into the system through the skimmer. It's a long shot but maybe you can look at your skimmer and see if it's sucking air.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    Re: Pump on for 30 seconds, off for 30 seconds

    ^^^ This.

    Your pump primes, it sucks the skimmer well dry, it sucks air and loses prime. Then the skimmer well fills up again because the pump isn't pumping, then the pump primes... and so on. Look for a sticking weir door or just low water level.

    Oh, and since it's your first post.... Welcome
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pump on for 30 seconds, off for 30 seconds

    Thank you. Not sure why that didn't cross my mind to begin with. I am filling up the pool and will see if that corrects itself. I figured it has rained so much the last couple months, I didn't need to fill it. I will let you know an update. I hope that is it! Thanks again.

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    jrs_diesel's Avatar
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    Aug 2014
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    League City, TX
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    Re: Pump on for 30 seconds, off for 30 seconds

    Try to maintain the water level about halfway up the skimmer opening. Higher than that is OK, but you will lose the ability for the skimmer to actually skim the surface.
    J.R.

    20K IG gunnite pool
    2HP Hayward single speed pump
    Cartridge filter

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