Question about iRobot Roomba 4210 Bagless Robotic Vacuum

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I have replaced the battery in my 4210 and reset the charge cycle. It has supposedly been charging for about 55 hours now and I plan to let it charge the full 72. Is it normal for the power light to become VERY pale?

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The power light changes color and on some models goes dim to indicate charge level. It will be ready to go when the light is at maximum illumination.

Posted on May 27, 2010

  • april1957 Sep 16, 2011

    Power light has been red for more than 16 hours, if I put it on the dock it, the charge light will turn green, I pressed the clean button the charge button will turn red and the vaccum will not work. I put a new battery in and charged it for more than 16 hours

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Roomba 4210 won't start


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    I noticed my run time was getting shorter and shorter, within the first 6 months. I checked my charger and base with a V.O.M. okay. About 4.4 volts on the base about 14 volts on the direct line. I bought...


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    Old or New battery not charging...or so it seems (Discovery 4XXX)


    the charger is not charging its not putting any thing out into the batterys the charger clock is working but your not getting any charge from it

    Mar 21, 2010 | iRobot Roomba 4210 Bagless Robotic Vacuum

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    Clean light blinks then solid orange button i bought a new battery dec


    Remove the battery and hold the power button for 15 seconds. This will restart the charging cycle as if the battery were new. If after 72 hours, it stays orange your battery is either sub-standard voltage or not sold as advertised.

    Feb 19, 2010 | iRobot Roomba 4210 Bagless Robotic Vacuum

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    I have iRobot Roomba 4210 and I have a problem with charge battery. The battery is new. When I charging a battery in other iRobot Roomba the battery was full charged. When I charging in my iRobot Roomba...


    The charging circuit on the main board is fried. This is a common issue. You need some good electronic repair skills, and equipment, to replace the problem components

    Nov 23, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

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    Model4210battry won't recharge, is it worth ordering a battery?


    don't buy a new battery yet. you can reset the battery by charging for 16 hours, if this does not work, you need to take the battery out, push and hold the power button on your roomba for at least 15 seconds then reinstall the battery. plug in the charger directly to roomba not the docking station and charge until the battery light on the roomba is green. do not interrupt the battery charging cycle. after, leave the roomba charging for an additional 3 days or 72 hours. after, run roomba in max mode and run it till the battery is completely depleted. this will improve the battery overtime by charging again for 72 hours and depleting the battery. do this 3 or 4 times. and the battery should get better

    Jun 28, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

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    4210 and 4230 won't charge-new batteries.


    I've been having the same problem myself. The charger is apparently built into the roomba main board. From what I've read there are two MOSFETs U2 & U4 that can go out and require replacement to fix the problem. More info here
    http://www.robotreviews.com/chat/viewtopic.php?f=1&t=3909

    Jun 28, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

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    Roomba 4210 replaced aps battery still does not work


    Try cleaning the silver contacts on the battery as well as the charging station with a small amount of rubbing alcohol such as an alcohol pad.
    Also check to make sure the dirt reserve is completely empty. Also check that the briushes are clear and can move freely.
    This 'not charging' is a very common problem with the Roomba and the manufacturers continue to sell rechargable batteries that are no good even though they are aware of the problem.

    Mar 29, 2009 | iRobot Roomba 4210 Bagless Robotic Vacuum

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