My Pool Pump Runs On Low Speed But Not On High Speed

23 thoughts on “My Pool Pump Runs On Low Speed But Not On High Speed

  1. AEP SWEPCO Louisiana has a $250 rebate for energy star variable speed pumps. The takes my Pure Line VS a done deal (and a steal!). =)

  2. I know it’s an old thread, but FYI my 2 hp 2 speed started this yesterday, would start on low but not high speed. Could start on low then quickly switch to high and would run. Replaced the capacitor, and now works fine.

    1. Thanks for the post, I hope thats the case, my 2hp pump did the same, I noticed it was off and went to check it out and it wouldnt work on high, but it did on low. Just ordered a capacitor for it. Fingers crossed. $20 versus $350

  3. Mine is the opposite. I just installed a new Pentair 2-speed 1.5HP 230V motor for my filter pump. It works fine at high speed, but not low speed. Any suggestion how to fix it?

      1. I am having the same issue. Pump runs fine on high speed, hums loudly on low speed and kicks the thermal protection switch. 1.5 hp motor is pulling 24 amps (instead of 3.6) on low speed.

        1. I have the same issue on an older hot spring hot tub, jets work fine(heating doesn’t happen with jets on high pressure as it’s plug in) but won’t pump at all when the jets are off(when it should be acting as a circ pump to support the heating element) heating works, thermostats work, pressure switch works, so it seems like the pump has lost it’s ability to do a low pressure pump(or isn’t activating) it’s been a rabbit hole!

    1. I have had my pool for 5 years and it just recently stopped working. The pump will work on low but when you put it on high speed it shuts on and off every 20 mins or so. My pool guys says I need a new high low switch put it and the guy that I bought my pool from says I need a whole new pump. Please help I’m a single mom 😩

      1. As the article mentions, it is usually a wiring issue if it is a brand new motor and there are several troubleshooting guides linked in the bottom half of the article for older motors that have recently started to malfunction. Do any of the scenarios link in the article resemble your set up?

  4. I have similar issue with my emerald spa. Has a waterway pump 3721621-1w5a.
    It starts and runs for a few seconds but then I get a load hum and the motor stops. I replaced the capacitor but it still acts the same. What is my next step? Replace motor? Since the hum makes me believe the controller is sending electricity to motor properly.
    Any ideas?

      1. Same problem and if I turn the shaft with a screwdriver the motor will start but on next cycle it will do it again. I ordered a capacitor but did not receive it yet.

  5. I have a 2 speed motor 230v for a spa both relay work for low and high 120 on white black red all the time test all wires on motor 120v on all the can on top reads 250v on one side 78v on other side then switched to low 120v on both sides

  6. I recently moved and setup a spa. The 2 speed pump starts in low, but when the pump goes into high speed, the breaker gets tripped. If I disconnect the pump from the control panel, the breaker doesn’t trip.
    I know the heating element is bad, but it’s currently disconnected, would blow the breaker as soon as power was turned on.

    Any advise would be helpful.

    1. Unfortunately, I don’t know the make and model of the spa or its wiring, so I can’t provide much guidance. It would be best if you had someone, either a pool/spa tech or an electrician, take a look at it in-person.

  7. My Hayward VS900 pump when running at a high speed (2900 rpm) will cause my pool to lose water. When my filter cartridge (150 sq ft for a 23,000 gal pool) was dirty, the tank pressure built up and the circulation flow was reduced…..no water loss. When the new cartridge was put in and circulation flow increased I lost over an inch of water overnight. How can I fix this?

    1. If the filter was the main issue, you should see obvious signs of leaks on your equipment pad. The increased flow may have exacerbated an existing leak, it could be a crack in the skimmer, underground plumbing, or anywhere on the pressure of the pump. The pressure side is the plumbing and equipment after the pump.

      Have you checked that all drain or waste lines are closed? Was the pump running all night or was it off? This will help determine if the water leak is in the plumbing or the pool basin.

  8. Your wiring diagram looks like it shows 230 volts to the pump on both the high and the low settings? Is that correct? What changes the pump speed?

Leave a Reply

Your email address will not be published.

Recommended Resources

What do I need to control a dual speed motor?

Poolside Chat Episode #46: What do I need to control a dual speed motor?

In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question: How do I control a dual...
Read Now
Why is my pool pump motor capacitor failing?

PSC Ep. 86: Why is my pool pump motor capacitor failing?

In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question:  Every four to six months, I...
Read Now
What’s the Difference Between a Start and Run Capacitor?

PSC Ep. 60: What’s the Difference Between a Start and Run Capacitor?

In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question: What’s the Difference Between a Start...
Read Now

Looking for pool parts?

Copyright © 2020 INYOpools All rights reserved