Plumbing, Heating and Pool Repair Guides

Polaris Booster Pump Troubleshooting & Repair Guide


The Polaris booster pump is the driving engine for the Polaris pool cleaner. The booster pump provides a higher pressure then the swimming pool pump can so it can drive the Polaris cleaning unit. From time to time your booster pump will need some repairs or could have a problems that can only be diagnosed with some booster pump troubleshooting. Polaris Booster Pump Troubleshooting & Repair Guide

Some common things that go wrong with the Polaris booster pump are bad mechanical pump seals, overheated suction and discharge fittings and leaks from the Polaris quick connect fittings. All of these problems can be fixed with a few replacement parts that are available online or from your local swimming pool supply store that carries replacement Polaris booster pump parts.To avoid costly booster pump repairs you should always replace the small parts that are starting to show wear or damage right away. This means if you start to see your pump seal leaking, don’t wait until it gets so bad that you cannot run the pump.
Polaris Booster Pump

Soon as you see it leak replace it. This goes for anything else you see going bad on the pump. If you feel that something is going to break or looks like its damaged, you will want to shut the pump off right away and fix the problem. Ignoring or “putting off” the problem with the pump will only let the problem become worse and that will usually cost you more money and time to do the repairs.

How To Change The Polaris Booster Pump Seal

The Polaris booster pump seal is located inside of the seal housing. You will have to remove the front of the pump to first access the impeller. Once you have the front of the volute off you will want to now remove the impeller. In order to remove the impeller you will have to grab the back of the motor shaft and then with your other hand you will want to twist the impeller counter clockwise spinning it until it spins completely from the motor shaft.

Now that you have the impeller off you will want to unbolt the seal housing from the frame of the motor. Once you remove the seal housing you can remove the seal base. This is just one part of the mechanical pump seal. The second part of the Polaris booster pump seal will be in the small shaft of the impeller. You will also want to remove this part from the base of the impeller, as you will be replacing both parts of the booster pump mechanical seal.

Once you have removed both the pump seal seat and the spring from the impeller you can replace both parts for the new replacement Polaris pump seal that you have bought. It’s always a good idea to put a tad of silicon on the outer rubber casing of the seal seat. This will hold the seat in place inside the seal housing and also safeguard the seal base from leaking. After you insert the seal base you can slip the other part of the mechanical seal onto the impeller. Now you can turn the impeller clockwise and thread it back onto the pump shaft until it’s tight. Once the Polaris pump impeller is tight you can re-assemble the rest of the Polaris pump as the pump seal has now been changed.

How To Repair Suction Leaks On The Booster Pump

The Polaris booster pump could have some suction leaks in a few common places. The most common places that the booster pump will draw air from is the suction fitting and the volute drain plug. To avoid any air being sucked into the Polaris pump you will want to make sure that you Teflon tape both he threads on the suction fitting and the Polaris pump drain plug.

How To Hook Up The Polaris Booster Pump

The Polaris booster pump can be piped directly into your swimming pools filter system using PVC pipe or it can be installed with saddle clamps that can be connected to the existing swimming pool plumbing. Either way there is only one correct way to hook up the Polaris booster pump.

There is two fitting on the booster pump. The fitting in the front of the pump is called the suction fitting. This fitting will get connected to the discharge side of the swimming pool fitting. This is very important, as you will need to feed the suction side of the Polaris pump with pool water from the filter system. That is why you need to hook it to the discharge side of the pool system. The second fitting or the second connection you will make is to connect the discharge side of the Polaris booster pump to the line that returns back to the pool or to a flexible line that will go to the pool. Whether the Polaris is hooked to the wall fitting in the pool or if its being feed from a flexible like from the top of the discharge side it is important to remember that the Polaris 360, 390 or the Polaris black max are pressure driven units.

How To Turn On The Booster Pump

The booster pump will run if the pool pump is running. This is a safe guard to make sure that the proper amount of water flow is going through the booster pump. As we explained above the Polaris pump needs water from the discharge side of the swimming pool pump so when the Polaris pump is wired by the electricians it should be wired to only come on when the pool filter and pump are running.

To turn on the booster pump you will want to first turn on your swimming pool pump and let it come to full prime. Once the swimming pool pump has been running for a few minutes you can either turn the booster pump timer switch or on use the manual switch that will be located somewhere near the filter system or the timer control panel. Some pools will have both the manual Polaris override power switch and the Polaris timer and some will just have one or the other. Depending on who built your swimming pool will depend on how they wired your Polaris pool cleaning system.

How To Set The Booster Pump Timer

If you have a timer on your Polaris swimming pool cleaner you will want to set it to go on 30 minutes after your pool filter timer comes on. You will want to have the Polaris cleaner shut off about 45 minutes before the filter system does.

To set the timer on the Polaris you first will have to locate the time box. Once you locate the time box you will want to open the timer cover door and inside you will see a dial and two-timer pins. These timer pins will each have a small setscrew in them that you can loosen by hand. One time pin will say off and one timer pin will say on. If you turn the setscrews to the left, which is counter-clockwise you can loosen them and then slide them on the dial to the correct time. Once you have the off and the on pin set you can switch the timer on and if its between those times and the pool filter system is running your Polaris will start working.

Popular Polaris Pump Troubleshooting Questions:

Question: “Does my Polaris Pump filter my pool?”

Answer: No, The swimming pool filter system actually filters the pool but the Polaris unit will pick up and bag the debris inside of the pool.

Question: “Where can I get my Polaris Pump repaired?”

Answer: Most pump or motor repair shops can repair the Polaris pump.

If you have another Polaris Pump question please ask below:


  1. Hi there,I check your blogs named “Polaris Booster Pump Troubleshooting & Repair Guide | Wet Head Media” like every week.Your story-telling style is awesome, keep up the good work! And you can look our website about proxy list.

  2. My Polaris motor works but it don’t seem to b pumping water to run my Polaris cleaner what is the problem and how can I fix it thank you for any advice, Craig

    • did you ever get an answer ? i have the same problem with my polaris pump, does not make a difference in the flow iof ewater if it is on or off , no pressure to run Polars , Thank you for any advise .

        • having same problem. looks like no answers.
          Pump is not leaking
          seal is not leaking
          do not detect air coming in

          But pump does not increase flow rate and polaris is not receiving enough water flow rate.

      • I just installed a new booster pump and had the same issue at first. the outlet would push water with the pump on but when I turned on the booster it had no pressure. since the booster pump is a pass thru when off the water just flows thru it. when turned on it pushes water in 1 direction so I realized the old pump had the input/output hoses reversed. I disconnected the hoses to see which one spit out water that needs to be the input. once i reversed the hose it worked.

  3. Changing out my Polaris booster pump the wiring area is very small. As are the screws and nuts! I dropped a small screw in to the pump. Will this affect performance and how do i get it out?

  4. My newly replaced Polaris 360 runs fine for 5 minutes then shuts down. After it cools it restarts then dies again. Checked Amp and found it was drawing 18 amp but is a 12 motor. All lines are clear and even with hose and cleaner discounted it shuts down.
    What’s up?

    • I am having the same issue. Cannot find one single pool tech that can figure it out. Here I am, trying to figure it out myself. Our old Polaris was doing this so we replaced it thinking it was going bad, only to find out the new one is doing it too. Had an electrician come out and check the control box and everything was firing up properly. We still do not know what the problem is.

      • Check start capacitor! Could be failing!
        Internal thermal protection going bad! Need motor shop or if you have an electrical diagram an electrician can disconnect!
        Hope this helps! Good luck!

        My problem is one rpm of booster pump! Only idea I have is start capacitor or is it a start/run! For around $15 I can replace which I think is a good alternative to a $200 to $300
        dollar motor!

      • did you found out the problem yet, we have this problem since three weeks, all parts replaced, wiring ok, nobody has a clue

  5. My booster pump was running fine now when I turn the switch on I get a click, but the motor does not turn on. Can you help me?

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