How do I fix my Roomba vacuum

it seems as if the robotic cleaner is having a problem sensing where it is or failing to notice where its charging station is try cleaning any optical/IR sensors and it maybe able to see once again where its charging dock is

try this
Amazon com roomba 780 battery

I have seen them at Meijer I repair many vacuums and that is the cheapest and best place to get them or guarantee vacuum and sewing center

make sure all virtual wall lighthouses are turned off. Your Roomba may be getting a signal to not proceed if the lighthouses are turned ON and facing the Roomba

Hey

Please look for other same problem posted here ;-)

You are probably facing a bumper sensor issue.
Try to clean the bumper first and if this goes on, either call iRobot service, or
take a look at this page for the step by step 9 beep fix.

Have fun
Avi

To change the batteries you simply remove the door on the underside of the unit. It requires you to remove a single philips screw.

Sounds like either the battery is bad or not being charged properly with subsequent loss of programming.

You may not believe this, but the new 500 series lighthouse virtual walls have both infrared and radio frequency communication. How they work and associate with the Roomba is pretty complicated. The best posting I've ever seen about how they work is here:
http://www.robotreviews.com/chat/viewtopic.php?f=1&t=11048

Check out that link to understand how the communication works.

If your Roomba is contained by the virtual walls, then you can assume the IR sensor on your Roomba us good....you should test that though. Then you might have to replace the "home base" which could have a bad IR transponder . New ones can be found for reasonable price at www.RoboticVacParts.com or you could order straight from iRobot for twice the price.

If the Roomba is not contained by the virtual walls, then the IR sensor on the Roomba is likely bad and you'll need to change the bumper on your Roomba. Again ....parts are available through ebay, or www.RoboticVacParts.com. Follow this link if you need it.
http://cgi.ebay.com/NEW-Roomba-500-series-white-bumper-510-530-532_W0QQitemZ270400281066QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef51cd9ea&_trksid=p4634.c0.m14.l1262&_trkparms=|301%3A1|293%3A1|294%3A30

Make sure your virtual wall batteries are fresh-- even if you're sure they are, try removing and replacing them just to reset the virtual wall.

Then reset your Roomba: hold down "spot" and "dock/demo" for about fifteen seconds. Release them and wait for the tune.

Recharge the Roomba and then try to run it. The virtual walls ought to respond at that point. If they don't, you might find that calling customer support may help.

Hold the Spot and Dock/Demo buttons down for at least 10 seconds.
The unit should now be reset.