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Thread: Salt Chlorinator System: No Flow

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    Salt Chlorinator System: No Flow

    I had a "no flow" error on my Auto Pilot and went on a goose chase trying to resolve it. Posting the resolution here so you can learn from what I went through. You won't find this on AutoPilot's website and I don't think this resolution has been posted anywhere on the internet. I searched pretty good. This applies to other chlorinator syetems as well that use a sensor to detect flow.

    Received the dreaded "no flow" alert after turning back on for the season. Checked the union valve screen. It was clean. Cells looked clean but went ahead and cleaned them again with water and acid according to Auto Pilot. Checked to make sure the system valves were all in the correct position. Reseated the tri-sensor cable. Ran the self-test. Prayed. Nothing resolved the problem, still have no flow alert and no chlorine production.

    Spoke to Auto Pilot and they recommended I clean the union screen. It was spotless. They recommended all of the above which I had already done many times. Still no flow. Auto Pilot suggested my out of warranty tri-sensor was defective/bad or possible a circuit board needs to be replaced which would cost me big $$$.

    Then in the middle of the night, after wondering what I had missed or could be wrong, I figured it out.

    The tri-sensor's flow sensor was not being hit directly perpendicular with flow.

    The tri-sensor is very sensitive and must be installed in the manifold precisely perpendicular with the flow. If it's off by just a few degrees, it could indicate no flow. If you have this problem remove your tri-sensor from the manifold and reinstall it as close to perpendicular as you can get it keeping in mind it can shift a few degrees as soon as you get close to tighten. This is likely to solve your problem without to replace expensive parts.

    If you run into this problem, let me know here if this resolved your problem. Curious to know who else has run into this.
    45' x 65" Rectangle, 85,000 gallons, marcite, 3 - 2hp Pentairs, sand, AutoPilot Professional 4 cells, Aquacheck Digital Reader, Aquachek Salt Water Chlorine Generator Test Strips (amazon has best price for 40 count!)

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Salt Chlorinator System: No Flow

    Welcome to tfp, joelster

    Sounds like a great tip!
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  3. Back To Top    #3

    Join Date
    Feb 2009
    Paradise (Hampstead, NC)

    Re: Salt Chlorinator System: No Flow

    I had a "no flow" indication from my Intex and heard a small amount of noise indicating air in the lines or cavitation. Turned out that a bubble trapped in the lines was causing turbulence and wouldn't let the flow sensor settle down. Purged the lines and.....flow! Sometimes it is the simple things....
    16X32 AB, Jacuzzi Laser 190 19" sand filter, 3/4hp Pentair Optiflo, CircuPool RJ30+ swg, TF 100

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