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Thread: Pentair ThermalFlo 500 heat pump won't turn on :(

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    Pentair ThermalFlo 500 heat pump won't turn on :(

    My Pentair ThermalFlo 500 heat pump won't turn on and I don't know what to do. None of the lights on the LCD screen will turn on, so it's obviously not receiving power somehow. I checked the main breaker in the house, and it is turned on. I checked the breaker that is right next to the heat pump, and it is definitely receiving power. The filter is pumping water into the heater and water is coming out of it since I can feel water moving through both pipes, but the heater is definitely not on. So there's obviously something going on between the breaker and the heat pump... what's the first thing I should check? Are there any hidden switches or buttons or something that I need to push to turn it on?

    I'm not an electrician by any means so if it's something complicated that only a trained professional can fix, who should I call? An electrician, an HVAC guy, a pool company guy? Or does Pentair offer any customer support?


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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Pentair ThermalFlo 500 heat pump won't turn on :(

    How old is your heater? If it's still under warranty I'd call Pentair. If it's not I'd call a pool service com[any and see who they'd recommend.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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