Question about Roomba Robotic Floor Bagless Vacuum

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Roomba 4108 does not charge

We bought a brand new model of roomba after a few weeks it would not charge called roomba company did not help left the unit for over a year thought to try it again bought a new battery replaced the old one charged 1 time and went dead in 15 minutes and smae problem recurred when plugged into a charger (for days now) continues to show blinking red light?

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  • Anonymous Dec 31, 2008

    when i plug the roomba the light is flickering red. it seems that it is not taking charge at all.

  • fryan1415 Jan 04, 2009

    My roomba 560 does the same thing -- won't charge even when left on the charger for more than 24 hours. I've sent 3 messages to roomba tech support without an answer from them.

  • Anonymous Jan 05, 2009

    Used it only once. Wouldn't recharge after 2 days of charging.
    Shows blinking red light.

  • ownrental Jan 13, 2009

    My Roomba Discovery also will not charge even with a brand new battery. Talked to i-robot customer support and they say that my internal charging system isn't working. They suggest buying a new roomba. Does anyone know how to fix this. I have tried to reset many times. I borrowed another roomba and tried my battery and charger with that roomba and then put the charged battery in my roomba. It worked fine, but after running the battery down my roomba again would not charge it.

  • beck00 Feb 26, 2009

    I am having the same problem with a Roomba 550 which is out of warranty. I replaced the battery and the new battery worked ok the first few times that I used it, now when I put it in the dock, or directly connect the charger to it I get a flashing red light with a ! next to it flashing once every few seconds (bad battery code) I have checked the contacts, tried resetting the unit -nothing works, I guess the battery could be bad but I just doubt that since so many others have the same problem. If its the charging circuit, how do you fix that?

  • martinb981 Apr 03, 2009

    I also have a 560 which flashes red and flashes the exclamation point whenever I try to charge it. Brand new battery. Did ALL the steps and then more...still, flashing red light.

    The last thing I need to do right now is buy a new Roomba; this thing is less than 19 months old. We liked it a lot when it worked but I've had toys for the kids with a lot more engineering and design that have lasted longer than this thing.

    I sent an email to iRobot so let's see how they respond. Meanwhile, I've just ordered a new Roomba for my sister and if I don't get a proper response from iRobot, I will cancel that order.
    And I will do everything I can to warn people NOT to buy Roomba. I've come across dozens of online posts from people who have the same issues with the red flashing light.

  • Anonymous Apr 14, 2009

    Same problem as everyone else...I had the Roomba Scheduler and it worked wonderfully for about a year. Then, one day, it just stopped holding a charge very long and now, not at all. So, my mother-in-law gave me her new Roomba, since she didn't use it much, and the same thing happened with the new one. I've tried re-setting the battery, but nothing works...:(

  • fryan1415 May 11, 2010

    When the battery is removed, the power button doesn't do anything. Is this really the correct sequence of steps?

  • Anonymous Mar 23, 2014

    Brand new Roomba 780 robotic vacuum. First run around my living room and a red light appeared that is shaped sort of like a trashcan. My DVD says to look in the owners manual, but there is no owners manual. I bought two units and neither one has one.



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Try resetting your Roomba by removing the battery, unplug the charging connector, hold down the Power button for 30 seconds. This will reset the charging system, replace your battery, connect your charger and see what happens. By the way do you also have a homebase ? If so try that too

Posted on Jan 10, 2009

  • lisaannvicto Nov 13, 2010

    Resetting the battery worked great! This was my first true problem... I actually have owned 2 successful roombas and have been very happy with both. The batteries themselves are only designed to last a year or two... that is the downfall of the product. Going into the purchase knowing that fact, I still love the product.


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Firstly the fastest killer of a battery, any battery, is over-charging. Charge per manufacturers instructions and then don't leave your item on the charger after it's charged. This goes for any device such as cel phones etc.

Second, clean the battery contacts. Our second hand Roomba was so dirty when we got it that the battery wasn't even making contact. Remove the brushes, clean them, clean off all the hair etc and use alcohol to wipe clean the two contact points under the brushes as well. It should take a charge after that.

Posted on Jan 11, 2009

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I smell a class action suit coming.

Posted on Feb 18, 2010

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I was having a similar issue, in that the battery did not seem to be charging, even though we bought a brand new battery. My husband realized that the battery wasn't staying locked in tight, therefore it wasn't engaging the charging ports. We found that if we pushed up on the battery, the charging light would come back on, but if the unit got bumped at all, it would disengage and stop charging again. So, we actually plugged directly in to the charging port on the side of the robot and got the battery charged, but then had more issues whenever it turned on to clean, it would vibrate and the battery would come loose and it would shut down. I tried securing the battery in place by wedging some cardboard down the side, which so far is technically working, although it did shut down once already when it ran in to a wall and must have shook the battery loose again. I may try adding another layer of cardboard to get it really snug and see how it goes.

Posted on Feb 15, 2013

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I just recieved a 4108 Roomba from a friend and it charges, or at least I think it did. The red light quit blinking and was red non-flashing, but when I push the clean button all it does is beep! What causes that=any help would be wonderful....

Posted on Aug 20, 2010

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We were just given an unused but old model 4108 (leftover from couple who used to sell them) and the battery stays charged for maybe 10 minutes...

And to iRowner's comment above about NOT leaving the unit charging constantly; a NEW Roomba we bought has specific instructions to LEAVE it charging all the time, ready for use. Of course if we have a cynical outlook one might say that this advice is given so that the battery actually WON'T last very long thus forcing the purchase of a new one.... but surely a manufacturer wouldn't ever suggest that, would they?! :(

Posted on May 06, 2010

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