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Flow Meter “Leaks” Every 10 Minutes



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    RainMachine Nicholas

    The leak detection indeed works by checking if it gets a minimum of 2 pulses from the flow meter in 10 minutes. I guess this happens with your flow meter and send some pulses even if water is not flowing but I'm unsure how this happens since this flow meter doesn't have a battery.

    Usually 1 pulse means 1 gallon or 10 gallons not sure how much is in Hydrawise spec.

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    Istvan (Edited )


    Could you share a picture of your setup? Since your flow meter needs only two wires to be connected, it must be a reed switch inside. I suspect you connected your flow meter between the S input and the C (common) terminal. If this is true, it means that a 50/60Hz signal is sent to the sensor input, fooling the system into thinking that there is a leak. Please note that the connection described on page 3 of the datasheet of your flow meter is not working for the PRO-16.

    The correct connection is between the S and 5V terminals, then there will only be impulses when the internal reed relay of the flow meter closes. See this article for further help.

    Rainmachine Support


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    Thanks for the responses Nicholas and Istvan. I will revert as soon as I meet my installer to go over the wiring, hopefully by the weekend as it's getting pretty cold again here in Boston ....

    Originally, he had installed three wires to the F, 5V, and G connectors, which is clearly incorrect. I tried all combinations of TWO of those three wires in F and 5V, but all still resulted in the leak/10min.

    So I suspect that there is a larger mis-wire between the ground and the Rainmachine. Your mention of the C terminal may be key.

    In any event, at least the expectation is that the Pro-16 works with Hydrawise flow meters!

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    This has been resolved, sort of. We went over the wiring and removed a single wire to G, leaving the two wires Hydrowise specifies attached to F and 5V.

    I had already tried this previously but this time no leak was detected other than the moment we disconnected the third wire.

    We are guessing the difference this time is that we had flushed the lines prior. Maybe the flow meter was “caught” mid-spin and needed a little nudge to settle. Honestly I’m not even sure that’s how flow meters work, but it’s all the explanation I’ve got!

    I look forward to the spring when the water is flowing again and the Pro-16 is in charge! In the meantime, time to figure out why my Weatherflow Sky is reporting too little rain accumulation ....

    Thanks for all your help. It is surprisingly encouraging to know that when something should work and that the fix could be simple!

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    The irrigation system has finally been turned on "in anger" for the first time and I'm getting the same error again. "Leaks" detected every 10 minutes, but seemingly only on occasion.

    But when it happens, it happens continuously without apparent end.

    Since my last post in December, we made no changes to the RainMachine wiring other than swapping the wires for two zones (so they show up in a more sensible order in the iOS app).

    I've only been watering manually, no programs yet.

    Any new ideas would be much appreciated! I do have a master valve and wondering whether the pre- or post- timings might help, but fundamentally I don't understand why the flow meter would have any issues. I guess it could be broken ....

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    I should add that any recommendations for known working flow meters with the RainMachine would also be appreciated. I'm not quite yet to replacing a brand-new Hydrawise flow meter, but the more time I spend on this the closer I get!

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    Glenn Verner

    I had a problem where the counter would increment about one click per second after connection just the F terminal to a reed switch flow meter, didn't make a difference if second wire was connection to 5V. I was able to get the meter to work by adding a "pull down resistor" between G and F. I don't know the exact resistor to use, I tried 2.2k and 820 ohm and they both worked. So my flow meter is connected to F and 5V with the pull down resistor between F and G, with about 200ft of ethernet cable to Flow Meter. Connection G to Ground also works.

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