Having problems with your iRobot Roomba 4210 Bagless Robotic Vacuum ?
4210 and 4230 won't charge-new batteries.
\015 Won't charge on their own docks nor a brother's dock. Must charge battery in other Roombas and transfer--runs & cleans great w/ charged battery; just won't charge itself. Sits on dock for days glowing red--hit the clean button and it's dead.. The charging problem seems to be in the robots themselves--have 4 of them and all docks are fine. HELP!\015
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
Repair Help & Product Troubleshooting for iRobot Roomba 4210 Bagless Robotic Vacuum
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