Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: New two-speed pump runs fine on low, shuts off on high

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    New two-speed pump runs fine on low, shuts off on high

    I installed a new Pentair Superflo (1hp) yesterday. Had some initial priming problems, but it primed fine this morning and water circulates well. But only for about a minute--then the pump shuts off. It stays off for a minute or two, then comes back on. This only happens on the high setting; it runs on low fine. Doesn't flip the breaker. It acts like it is overheating and flips some kind of shutoff, but it happens after 1 minute max (including first thing in the morning) and the motor doesn't feel hot at all. The hp on this motor is lower than the one it is replacing, but I can't imagine that would make it strain more somehow (again, runs fine on the low setting). Voltage to the pump is ~240. Any help would be greatly appreciated!

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: New two-speed pump runs fine on low, shuts off on high

    Did you replace the entire pump or just the motor on your old pump?

    Is the wiring correct?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    Re: New two-speed pump runs fine on low, shuts off on high

    I replaced the entire pump (motor and wet half--bought new as a single unit). I think the wiring is correct; it seems pretty straightforward: one load wire to 1, one load wire to the toggle switch (which has wires going to 2 and 3) as in the attached image:

    pump_wiring.jpg

    It definitely seems like some kind of internal overload relay is getting thrown, but I can't imagine why. Although this pump is smaller than the old one (1 hp, sf 1.25 versus 1.5 hp, sf ~1.5), it does seem to be moving water through the system at the same speed, but not more/faster. Can you imagine anything I did wrong with the wiring? Having played around with it some more this morning, I'd say my original estimates were a bit off: it runs for ~30 sec, then shuts off for 2-3 min.

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: New two-speed pump runs fine on low, shuts off on high

    It does sound like a thermal switch being thrown, but I would think the motor would be very hot to cause that to happen. I had on doing that and the label was yellowing and it smelled like it was burning.

    Did you check the actual voltage at the motor? I am kind of grasping at straws.

    I suppose there is the possibility that you got a bad motor.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  5. Back To Top    #5

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    Re: New two-speed pump runs fine on low, shuts off on high

    I haven't checked voltage at the motor yet (hoping to avoid working in that tight space again!), but I'll check that next. Would voltage in the low 240s be an issue if the pump label states a 208-230 range? Is there any kind of shut-off switch other than a thermal one? I agree that it couldn't possibly be truly overheating. Thanks for the help on this.

  6. Back To Top    #6

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    Re: New two-speed pump runs fine on low, shuts off on high

    243V at the motor (244 at the timer). Just ran it on high with the back panel off--same result (ran for 20-30 seconds, then shut off). No burning smells; connections look tight. No wires rubbing the shaft or anything like that.

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: New two-speed pump runs fine on low, shuts off on high

    I am at a loss. Might consider looking into warranty replacement.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  8. Back To Top    #8

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    Re: New two-speed pump runs fine on low, shuts off on high

    Well, thanks for giving it some thought. Guess I'll call Pentair on Monday.

  9. Back To Top    #9
    n240sxguy's Avatar
    Join Date
    May 2014
    Location
    Benton, KY
    Posts
    1,800

    Re: New two-speed pump runs fine on low, shuts off on high

    Sounds like you just got a bad one. That thermal overload is just an automatic breaker basically. Just like all manufactured things; every once in a while you get a bad one.


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

  10. Back To Top    #10

    Join Date
    Jun 2014
    Location
    tucson
    Posts
    9

    Re: New two-speed pump runs fine on low, shuts off on high

    Thought I'd give a final update for anyone with similar issues. Pentair sent a tech out to make sure the installation was done correctly so the warranty would still be valid. It was. He replaced the bad motor and everything has run fine in the ~2 months since. Simply a bad motor out-of-the-box. Never heard back from Pentair with any details. Thanks for the help everyone!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •