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Thread: Underwater light puzzle

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    Join Date
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    Underwater light puzzle

    Background : Purchased house with pool in November, there's pretty spotty service history and the local pool guy has been pretty much useless..

    As part of a SLAM it was recommended that I remove my underwater light to clean in behind, which was a great suggestion as it was gross back there! But when I pulled the fixture out the real problem became evident. The fixture itself was full of water.

    The puzzle here is that the fixture was also sealed air tight, it took a bit of effort to pry the lens off even after removing the retaining ring, and pusshing/pulling the rubber seal resulted in some air bubbles.

    Inside the bulb was shattered on one side and there's what looks like mud.

    I've never been able to get this fixture to light, BUT also never had a breaker blow in the house as I would expect if it was shorted out like it was. It's possible that it was disconnected at the junction box, or is there something else in the system I should be checking?

    Also what to do with the fixture that somehow took on water despite being airtight?

    ~30kgal in-ground concrete
    Hayward S-240 300lb sand filter
    Hayward 1HP pump

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    Mod Squad pooldv's Avatar
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    Re: Underwater light puzzle

    Replace it. That is definitely some weird stuff going on there.

    You need to figure out what niche and light you have now, how long the cord is, because the cord goes all the way through the conduit back to the electric panel.

    Looks like this
    Pentair Amerlite Pool Light 78421100. Pentair 78421100. Pentair Amerlite.

    - - - Updated - - -

    Or stick it back in the niche and don't worry about for now. We almost never use our light because it attracts bugs to the pool.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Underwater light puzzle

    It has the sticker on it with model # etc... It's a Hayward light. The wiring goes up to a junction box just outside the pool surround, and the wiring is still connected to that point.. Wiring also goes out of that to somewhere else, but not sure where yet.
    ~30kgal in-ground concrete
    Hayward S-240 300lb sand filter
    Hayward 1HP pump

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    Divin Dave's Avatar
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    Re: Underwater light puzzle

    The wiring in that J Box by the pool surround, likely goes to the light switch, or to a auto control panel, if you have one.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Mod Squad pooldv's Avatar
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    Re: Underwater light puzzle

    Yep, should come out at the equipment pad.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  6. Back To Top    #6

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    Re: Underwater light puzzle

    I have at some point turned on every switch and breaker I can find..

    ~30kgal in-ground concrete
    Hayward S-240 300lb sand filter
    Hayward 1HP pump

  7. Back To Top    #7

    Re: Underwater light puzzle

    If you replace it, LED lights don't attract bugs.
    Light goes to j box, from their it could go to an outlet maybe even a GFCI outlet, or it goes to the switch. But really it could go anywhere. But the normal logical places are above. Use a tester and check for power at the jbox.
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