The issue arises when a user’s Roomba robot throws the charging error 1 with blinking red lights (sometimes with a vocal warning as well). You can fix your Roomba not charging by cleaning the battery and robot terminals as discussed below but before that, make sure that removing the battery from the compartment and directly connecting the charging cable brings out the Roomba charging error 1 (to rule out any motherboard issue).
Clean the Battery Contacts and Roomba Robot Terminals
This error occurs if the battery’s terminals or Roomba robot terminals are rusted (or have accumulated carbon/ dust over them) and cleaning the contacts/ terminals may solve the charging problem.
Insert Fillings in the Battery Compartment of the Robot
Your Roomba robot may show the charging error 1 with a red blinking light if the battery is not properly fitted in the robot’s battery compartment and putting a filling like a corrugated paper in the sides/bottom of the battery may solve the problem. This happens very commonly with new batteries when they are installed. If that did not work, then you may have to use a new genuine Roomba robot battery. If the issue persists with the new battery, then get your Roomba robot checked for a motherboard issue.
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