iRobot Roomba 980 Charging Error: Flat Battery Icon & Exclamation Mark Flash 6 Times

I have a problem with Roomba 980 vacuum cleaner.
I don't want to charge. When inserted into the docking station, the flat battery icon and the exclamation mark flash 6 times.

Please help, what could be damaged?

The reason could be that when the turned off vacuum cleaner was accidentally flooded with water.
Without turning on, the vacuum cleaner turned on the first parts and dried thoroughly. After submission is just such a symptom.

After switching on, the vacuum cleaner works for a while, connecting to wi-fi. It is possible to configure, etc. I cannot vacuum because there is information that the battery is too low. The motherboard has power supply from the base of about 22V, I do not have a diagram, so it's hard for me to diagnose the damage.

Below is a video like roomba displaying an error:

[youtube] https://www.youtube.com/watch?v=QZZb0N0C_G0 [/youtube]

Hello, I know that some time has passed from your post, but I have the same problem with the new irobota, the first time I received a loading error 6.
Question; what was the reason for your fault and how did you fix it?
Greetings and wishes MERRY CHRISTMAS

I warmly welcome.

I honestly say that I have no idea what the reason was. I gave the iRobot to the service and the distributor replaced it under warranty for a new one, leaving only the old docking station.