Polaris 3900 sport won't stay on the bottom of pool

SOURCE: The rear end does not stay in contact with the pool bottom.

This cleaner has a couple of places to look for the reason that the cleaner is not operating properly. The first thing to look for is debris in the cleaner and the In-Line Filter. Check to see if there is anything inside the unit also. The next place to look is that Float on the cleaner. If it has water in it, there is the problem, there should be no water in the float.

Check for wear on the tires as well. If these items are fine, then you will need to check all of the internal tubing and elbows. If you have your manual, go to the parts breakdown and you will see that there are lots of little tubes and elbows that could have a piece of debris in them. This is not a fun thing to check on, I will let you know that one.

If you do not have a manual for the 280, if you follow the link below it will take you to one online.

http://www.polarispool.com/files/manual/PolarisManual280.pdf

SOURCE: The rear end of the polaris does not stay in

It sounds like there might be water in the head of your automatic pool cleaner. Take the head off and shake it. If you hear water sloshing around, you will need to replace the head.

SOURCE: Back-up valve is not working properly. Can I take

With these pool cleaners, if they are not backing up, there are several things that you could try. Lift the valve out of the water and watch the jet. It should be going on and off. If it is not, you will need to replace the back up valve. If it appears to be working properly, try adjusting your wheel RPM.

SOURCE: My polaris 3900 moves across

Check your wheel RPM. If the pool cleaners RPM is over 32, reduce the water flow so that the cleaner makes proper contact with the pool's surface. Verify the back-up valve is cycling. Lift the valve out of
the water and watch the jet. It should come on and go off. You might also need to adjust your thrust jet if it is causing the cleaner to lean too far to one side.

SOURCE: My Polaris 3900 Sport is

With these automatic pool cleaners, if they are not staying firmly on the bottom of the pool, it is most likely that there is air in the appliance casing.Try submerging your cleaner. Keep the cleaner vertical while you are putting it in slowly to let the air out. Ensure the unit sinks to the bottom of the pool.