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Thread: 2-Speed Variable Pump only works on high speed - HELP!!

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    2-Speed Variable Pump only works on high speed - HELP!!

    Dear TFP Folks! First and foremost, thank you for a great site chock-full of valuable information for the DIY pool owner. I have had a salt water pool (Hayward Aqua Rite Salt Chlorinator) for about 5 years now (5 very happy years) and am running a Century/Pentair Whisperflo 2-speed variable pump (Model #WFDS-24).

    The timer was set by the pool company when installed to run on high speed for 3 hours and the other 21 hours at low speed. However, for about a week now, the pump only runs on high speed. The manual switch override changes nothing. In other words, whether I set the lever to low or high, the pump remains on high. I am able to shut off the entire system altogether and do so for a few hours in the day since I know I am spending lots of electricity when it runs on high speed.

    Before I make a service call, I just wanted to know if this is something simple I can diagnose and fix? Also, does this sound like the wall panel that controls the speed that's the problem or is it the pump? Your quick reply is greatly appreciated.

    Thanking you I remain,
    21,000 gallons
    Pentair 420 Clean & Clear Plus Cartridge Filter - Filter Area: 420 - Design Flow: 150
    Inground Plaster
    Pentair Whisper Flo Pump - 1 HP - Model CCP420
    Pentair MiniMax NT Series Pool Heater
    Aqua Rite Electronic Chlorine Generator
    Polaris 280 Cleaning System

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    polyvue's Avatar
    Join Date
    Aug 2009
    Sacramento, California USA

    Re: 2-Speed Variable Pump only works on high speed - HELP!!

    Designhaus, Welcome to TFP

    I'm sorry that I'm unable to answer your question regarding your Whisperflo 2-speed variable pump, but I am sure others will see this and respond.

    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
    View of spiral galaxy in Ursa Major NGC6217 - Hubble Telescope 2009

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

    Re: 2-Speed Variable Pump only works on high speed - HELP!!

    It's probably the contacts in the timer but answer a few questions and we'll know more.

    Has the manual switch override worked in the past?

    Are you comfortable troubleshooting electrical equipment?

    Is the timer mechanical or electronic?

    Lets start with those.
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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