Question about iRobot Roomba 4210 Bagless Robotic Vacuum

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IRobot Roomba Discovery not moving across room.

Roomba starts by going in increasing circles then moves in a straight line until it hits the first obstacle. It doesn't "bump and go" as it should, but continues in circles lifting up and down, until turned off. I have cleaned the filter, brushes and wheel areas several times but no improvement. PLEASE HELP ME!!! Thank you Gail

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Re: iRobot Roomba Discovery not moving across room.

I had the same kind of problem with my model 400 today...after starting it and having it go in a circle for 30 seconds or so it would finally run into something and then back up a few inches, turn, then go forward a few inches, then back up a few inches, turn, then go forward a few inches, etc., etc.. I tried cleaning off the four pairs of sensors under the bumper and blowing out various things underneath (by mouth since I didn't have any canned compressed air). It didn't really help. It then occurred to me that I had a leaf blower! I put the Roomba upside down on the grass, put the leaf blower on high, and blew at it from all directions and up close. More dust came out than I thought would. It has been running normally now for the last 45 minutes.

Posted on Sep 14, 2008

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3 Answers

Roomba starts out in a circle goes wider and wider then all at once goes in circles.

when it starts doing that hit the start button again then wait a few sec.

Jul 19, 2010 | iRobot Roomba 560 Robotic Vacuum

2 Answers

Roomba going in circles

Roomba going in circles. Called irobot and if reseting it (by taking out the battery, unplugging it from the charger, and holding down the power button for 30 seconds), didn't work, turn the roomba over, take a compressor and blow air into the front. Maybe a shop vac would also work. We cleaned out the whole thing while we were at it. And now it works just fine. The tech person at irobot was very helpful.

Mar 14, 2010 | iRobot 530 Roomba Vacuuming Robot, White...

1 Answer

My roomba discover started running realy slow or barely moving when on carpet

Replace your belt also check the end-caps on your beater bar to see of they are packed with fibers. clean out any you find.

Feb 19, 2010 | iRobot Roomba Discovery SE Bagless Robotic...

1 Answer

Turns in circles, acts like it hits a virtual wall then stops

Reboot is probably not your solution. Your Roomba will react to invisible signals or 'interference' from other electrical appliances as well as the invisible wall boxes. You can clearly see how this happens when a Roomba gets near your computer or other device that is on. Also, the Roomba will go in circles when the dirt chamber is full or it thinks it's full. Try a thorough clean of all major parts including the brushes. Sometimes this activity will occur when the brushes get snarled on thread or carpet fibers.

Oct 09, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

1 Answer

My Roomba Discovery doesn't appear to hold a charge

That sounds like a classic battery failure in the Roomba discovery series. There are sensors inside the battery pack that go bad too. Either's not very practical to repair the battery....the best shot you have would be to order a replacement battery. You just pop the old one out and then put the new one in.

They are available from iRobot for $69 at this link:

There are sources of less expensive (about $35) Genuine iRobot quality batteries also. You could try at this link:|301%3A1|293%3A1|294%3A30

Jun 21, 2009 | iRobot Roomba Discovery SE Bagless Robotic...

2 Answers

Dont move forward.

Blow out the unit with compressed air, particularly around the wheels and under the bumper. Tap the bumper with your hand.

If your Roomba stops and beeps at you, count the beeps AFTER the initial "uh-oh" tone. Then call customer support (1-877-855-8593) for assistance.

Good luck.

May 29, 2009 | iRobot Roomba Discovery SE Bagless Robotic...

1 Answer

I robot won't go forward

Apache Server at Port 80

May 29, 2009 | iRobot Roomba Discovery SE Bagless Robotic...

1 Answer

Roomba Discovery 4210 was "played with" by 3 year old

go to and send it to them to get it ran through a battery of tests.

Apr 10, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

1 Answer

Roomba just runs in small circles

i just recently had someone bring in a roomba discovery and all it would do is stay in a tight 4 tile area and go in circles. battery was fully charged and all bumpers were clear.

i took a can of air blast for cleaning computers and blasted the area on the bottom underneath the sensor and watched as several dust bunnies came flying out.gave it a few more blasts for good measure and put it back on the floor and hit power then clean buttons.

thing went in same tight circle for 2 passes then the circle got bigger for 2 more passes , blue light indicator came on and it made a straight line dash across to closed door and started following the edge and criss-crossing the room.

called the owner back in to test and it repeated the same moves when she started it and all appeared to be working normal again.

Aug 13, 2008 | iRobot Vacuums

2 Answers

I robot discovery

I have takin several Roombas apart with this problem. Basically the sensors on the bumber are blocked so the roomba thinks it is hitting something. I believe this is a design problem because it is so common. If you could see how the bumbers work, there is an infrared sending unit and an infrared receiving unit (they look like little LED's. when the bumper is pressed, a plastic piece moves between the two infrared led's blocking the transmission. This signals roomba to stop and backup. What happens over time is the sending led thing gets dislodged and moves slightly. The receiving led can't sense the signal so it thinks the bumper is depressed.

Hard to explain, but I have fixed the problem by shimming the led back in place and worst case, I drilled the hole in the plastic piece a little larger. Solved the problem and I have recaimed several roombas that were considered scrap. Irobot should fess up to this known problem and issue a fix for everyone of the defective units.

Jan 16, 2008 | iRobot Roomba 4210 Bagless Robotic Vacuum

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