When your robotic pool cleaner isn't performing like it should, a few tweaks can usually get it back on track. Most of these fixes require only common tools and materials to complete. The best part is that you can often fix the problem yourself, saving you money and time at your local pool shop.

If your cleaner isn't climbing walls as it used to, this could indicate a problem with its cleaning pattern or its speed. Making a few adjustments to these settings may allow it to approach the wall more closely and overcome its tendency to hug the base or sides of the pool.

Often, the cause of erratic movements is water inside the unit's handle. Simply removing the handle and allowing it to dry completely can remedy this issue.

Another common reason for erratic movements is that the unit's wheels are turning too fast or too slowly. The owner's manual should recommend the proper wheel RPM setting for your model, so refer to it for this information. Changing this setting can help eliminate tangled hoses and improve vacuuming efficiency.

A common cause of a slowed movement is a leak in the float hose that runs from the cleaner to the return jet. Make sure that this hose is not leaking anywhere along its length. Leaking in this hose will significantly reduce the power of your robot, and it may stop working altogether.

Some models use a backup valve that reverses the direction of the machine every few minutes to prevent stalled operation. If yours does not have this feature, you should set a delay timer for it. This will ensure that the entire cleaning cycle is completed before circulation pumps are turned back on.

It is also possible that the unit's sensors are not working properly, and are sending confusing signals to the cleaner's drive electronics. Check the owner's manual for your model to see if the sensor is functioning correctly. If not, it should be replaced.

The last thing to check is that the cleaner's floats and swivels are in good working condition. If these are clogged with dirt or debris, they will not be able to float properly and will inhibit the flow of water. Also, the swivel on the vac head should be free to rotate.

The thrust jet on the back of the cleaner is also important to consider. The default position is 11 o'clock, but if this jet is too low or high it can cause the cleaner to turn in circles instead of moving in an effective manner. It's a good idea to test the thrust jet by holding it at each of these positions and seeing what effect it has on the cleaning pattern. You can change this by adjusting the throttle screw located at the top of the unit. Be careful not to over tighten this screw, as this could damage the float. If you are unable to correct the problem by following these tips, your best bet is to visit your local pool shop to speak with a technician about replacing the unit.