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Thread: Optical sensors on FMM stopped working, always shows as OPEN

  1. #1
    Regular Vistor
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    Jan 2013
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    Plano, TX
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    Optical sensors on FMM stopped working, always shows as OPEN

    My FMM has a green active light and all 4 sensor switches show up in my Apex dashboard. It has been working fine for a few weeks (since I got it), but suddenly the switches always show as OPEN even when they are clearly under water. It has locked up my water changes and topoff in the meantime. Any advice?

  2. #2
    Frequent Contributor zombie's Avatar
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    Denver, CO
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    Update the FMM firmware. There are other things that could cause this problem, but if its effecting all of them, firmware is the most likely culprit.

    Sent from my SM-G965U using Tapatalk

  3. #3
    Regular Vistor
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    Jan 2013
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    The firmware was the most recent version, but I went ahead and hit 'update firmware' just in case there was a corruption issue. At some point in the last few hours the sensors switched to closed anyway, but the problem is that if it continues to do this when refilling my auto-waterchange reservoirs I am going to have a flood on my hands. I will see how things progress after the firmware update and report back. Thanks.

  4. #4
    Frequent Contributor zombie's Avatar
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    I would give them all a little push in too just to make sure you didn't leave them all a little loose in the jack.

    Sent from my SM-G965U using Tapatalk

  5. #5
    New User
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    Mar 2018
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    UK
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    I had this issue and it turned out to be a faulty optical sensor. Was replaced under warranty after a lot of diagnostics from Apex USA.

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