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It is likely an optical sensor, leak detector, or flow sensor on a FMM module.Thanks Paul. I guess that’s my problem. Not sure what’s setting it off. Everything looks normal to me. What is SW3_1?
Don’t know if this helps.
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So I figured it out. My protein skimmer cup Had overfilled and the alarm went off and I never reset it. Just wanna thank Neptune systems for the 1000 alerts I’ve gotten. Better safe than sorry.