Ray Vac Pool Cleaner for Inground Concrete: Our Ray vac worked well for years but now it tends...

Remove the six screws from the side of the backup valve and remove the gear assembly and replace it with a new one.

Clean the bottom screen first.
Where the hose hooks to the wall you have a finger screen either in the wall or sticking out of the wall. Ether way pull that out and clean it.
Chech all of your hose floats and jet's make sure none leak and check the float inside the head. Good luck.

Your backup valve has probally gone bad. You just need to pull this out of the line and take it to a pool store and have the internal replaced. They will do this for just the price of the part in most places.

Make sure that your automatic pool cleaner doesn't have an obstruction in the hose that might not immediately be visible. This could cause it to circulate in one end of the pool. Also, check the water pressure to ensure that it has enough force to travel the entire pool.

you have a clogged line. disassemble and clean it very good
it should work fine after cleaning all ports out

What model is it? Is it robotic (indepentdent of your pump and filter)? If it is attached to your pump system, it could be the cord getting tangled and causing the pool cleaner to move in circles. You might want to consider running it when you are available to watch it or getting a robotic cleaner that you can set to operate at certain times. You might just need to check the hose for defects that would cause it tangle.

You should be able to get your pool shop to rebuild this for you, usually just for the cost of parts. Then you should take it in to them once a year to be checked as prevention is worth more than cure. Good luck.

Could be something as simple as the direction of your return jets in pool creating a current in pool or more likely a hole in hose or stuck back up valve. If you pull the whole unit and take it to your pool store they will usually check it out and fix it just for the price of the parts.

Replace the backup valve

A couple of things to check. 1. sometimes the hose at the back of the head will develop a small hole or crack where water will escape and cause the vac to run in circles.
2. if the head is getting old, you might have enough wear that the little wheels on the bottom stay mostly in one location, pushing in one directon.