Troubleshoot charging error 13

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1. If there're some stains or rust on the charging contacts on the dock or underneath of the robot, please use a piece of cloth moistened with alcohol solution or an eraser to remove them. See attached picture "charging contact". 2. Please check if the dock charger is working or not. The indicator light in front of the dock should be solid on without the robot and off with the robot placed on it. See attached picture. Kindly double check if the cable and the slot of the dock are well connected. Please push the cable head into the slot at bottom of the dock very hard. 3. Please unplug the charging dock, and leave it there for about 2 minutes. Then please re-plug it and try again. 4. You can also try another outlet.