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Thread: Cold water coming into hot tub

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    Cold water coming into hot tub

    I'm having a problem with my hot tub after the heat turns off.

    I have a hot tub that spills into the pool. During pool filter and cleaning modes, the return filters into the tub to refresh the water, which then spills into pool.

    My problem started recently. After the heat is turned off for the tub, the actuator is returning to filter mode but the pump remains on, sending cold pool water into my hot tub.

    Filter and cleaning modes are both switched off, finished their programs, prior to tub use. Nothing seems to be on at the spa side control but pump is running in pump room.
    30k gal, IG Plaster, 520 sqft Cartridge filter, Intelliflow VS pump, Intellichlor IC40, Jandy AE-Ti heat pump
    Spa jets-Pentair 1.5hp pump.
    Water feature-Intelliflow VS, Hayward 120 sqft cartridge filter.
    Screenlogic, Intellibright LED lights, Pentair Easytouch control,
    New plaster, pumps, plumbing, solar panels and lights 11/2012.

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    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    Re: Cold water coming into hot tub

    Quote Originally Posted by Jskiwi View Post
    My problem started recently. After the heat is turned off for the tub, the actuator is returning to filter mode but the pump remains on, sending cold pool water into my hot tub.
    Maybe I am missing something, but isn't that what it should be doing? When you turn off the heat/stop using the tub the water should be coming from the pool? Which pump runs when you turn off the heat?
    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.

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